Skull Type Research Articles

Time and sequence of emergence of the deciduous dentition in dogs and its applicability for age estimation.

This study investigated the influence of several covariates on the time and sequence of deciduous dentition emergence in puppies. Data were obtained in a longitudinal study, with some cross-sectional observations, of 1001 puppies of 53 dog breeds. A parametric proportional hazards survival model was used to estimate median emergence time and evaluate the effect of the covariates. No significant differences were found between the left and right sides of a puppy's dentition, but differences were statistically significant for the earlier appearance of maxillary incisors and canines and later appearance of maxillary premolars compared with their mandibular counterparts. The tendency for delayed onset and completion of emergence in female compared to male puppies was statistically but not clinically significant. The differences between puppies of breeds of different size or skull type were both statistically and clinically significant, with small and brachycephalic breeds showing later emergence times, longer clinical eruption times and more individual variation. Per quadrant, regardless of dog breed, canines or incisors were usually the first teeth to emerge and fully erupt, followed by premolars in the order Pd3 > 4 > 2. The maxillary canines and incisors usually emerged earlier than mandibular canines. Age estimation standards for breed size groups are presented based on the number of emerged teeth per quadrant. To assess whether a puppy has reached the legally required minimum age of 8 weeks to leave the litter, the best predictive capability using the data from this study is obtained when assessing the emergence status of the deciduous third premolars.

Age estimation in young dogs by radiographic assessment of the canine pulp cavity/tooth width ratio.

Age estimation in adult dogs can be performed by the radiographic measurement of the tooth pulp cavity, but the technique has hardly been described. In this study, the application of measuring pulp/tooth width ratios (P/T ratios) of the maxillary canine teeth was investigated. Pulp and tooth widths were measured at two locations on 166maxillary canine teeth of the heads of 84 dog cadavers, using digital extraoral lateral oblique open mouth radiographs. The dogs belonged to different breeds and sexes and had a known age between 194 and 1907days (approximately 6months - 5years). Both at the cemento-enamel junction (CE) and the half-height of the tooth, a comparable non-linear regression with age was demonstrated. Measuring at the CE location was less hindered by wear or superimposition. No statistically significant difference according to sex and breed size and no clinically significant difference according to skull type was found. The highest predictable capacity was found in the youngest dogs until the age of 448days, of which 84.4% of the canine teeth had a P/T ratio above 0.39. Our results demonstrate that measuring P/T ratios of canine teeth can be used in practice to assign dogs to age categories, with the highest accuracy in young adult dogs.

Evaluation of Morphological Variations in Pars Tympanica of Temporal Bone in Dogs

In this study, it was aimed to examine the relationship between the morphometric-geometric features of the meatus acusticus externus, bulla tympanica and tuba auditiva and the cranium shape, age, gender and race characteristics in the os temporale region in terms of the clinical-anatomical approach to the outer ear and middle ear regions of the dogs’ skull. In the study, a total of 110 dog's cranium were studied. The bones were photographed in three different views with the camera. The morphometric data on the head, angle measurements and index values related to them were calculated in obtained images. Tuba auditiva angle and meatus acusticus externus angle were found to differ statistically between the age groups. In addition, it was determined that the index values of bulla tympanica, except for the height index, showed statistical differences among age groups. When the angle measurements and index values of the skulls of male and female animals are examined it was determined that other index values did not differ between female and male animals, except for the meatus acusticus externus angle. As a result, it can be said that age and skull type is more effective than gender in the position of the tympanic region in dogs. The results of this research are supportive information that can be used in both clinical and zooarchaeological studies on the bulla tympanica region in dogs.

Plasma sodium and potassium concentrations after hypophysectomy in dogs with corticotroph adenomas.

BackgroundElectrolyte abnormalities, especially hypernatremia, are frequent complications after transsphenoidal hypophysectomy in dogs with pituitary‐dependent hypercortisolism.ObjectivesTo describe electrolyte abnormalities after transsphenoidal hypophysectomy and to investigate possible associations between postoperative hypernatremia and clinical and surgical variables as well as with postoperative outcome.AnimalsOne hundred and twenty‐seven client‐owned dogs.MethodsDogs with pituitary corticotroph adenomas that underwent transsphenoidal hypophysectomy were retrospectively included. Plasma sodium and potassium concentrations were measured −2, +2, +8, +24, and +48 hours from hypophysectomy. Clinical (breed, age, body weight, skull type, urinary cortisol/creatinine ratio, percentage of suppression to dexamethasone) and surgical variables (duration of anesthesia and surgery, pituitary dimensions) were compared to the development of hypernatremia.ResultsPostoperative hypernatremia developed in 46.5% (57/127) of dogs and hyponatremia in 6.3% (8/127). Plasma sodium concentration increased after surgery and peaked at 8 hours after surgery, normalizing after 24 to 48 hours. Plasma potassium concentration increased without exceeding the reference limit.No significant associations were found between clinical and surgical variables and hypernatremia, or between hypernatremia and postoperative death, long‐term survival or recurrence.Surgery time was significantly longer in dogs that developed persistent diabetes insipidus (P = .02) and persistent diabetes insipidus occurred more frequently in dogs with enlarged pituitary glands (P = .01).Conclusion and Clinical ImportanceHypernatremia remains a frequent postoperative complication after transsphenoidal hypophysectomy but did not appear to have an impact on postoperative outcome. No predisposing factor to postoperative hypernatremia was identified. Variations in plasma potassium concentrations do not seem to influence postoperative outcome.

Systematics of the mountain-inhabiting cottontails (Sylvilagus) from southwestern United States and northern Mexico (Mammalia: Lagomorpha: Leporidae)

The skull morphology of four species of cottontails from the mountains and plateaus of southwestern United States and northern Mexico, currently recognized as Sylvilagus nuttallii, S. cognatus, S. robustus, and S. holzneri (=S. floridanus holzneri), was analyzed using multivariate statistics. Based on 26 or 30 measurements taken on each of 350 adult skulls, and formulation of 16 pooled samples, with each representing a different geographic population, the results show there are two species-level distinctions in skull type. Cottontails from southern Utah, northern and east-central Arizona, and northern New Mexico show morphological overlap among geographically adjacent samples and all have a highly arched skull. These are referable to S. nuttallii. Cottontails from central Arizona, central New Mexico, and western Texas southward along the Sierra Madre Occidental to Durango, Mexico, and Sierra Madre Oriental to central Coahuila, Mexico show morphological overlap among geographically adjacent samples and all have a relatively flat skull. These are referable to S. holzneri. Both S. nuttallii and S. holzneri are polytypic in the study area. Sylvilagus n. pinetis is restricted to the White Mountains of Arizona. Those north and west of the Colorado River in Arizona and Utah are referable to S. n. nuttallii and those from southeastern Utah, northeastern Arizona and northern New Mexico are referable to S. n. grangeri. The population of cottontails previously referred to S. cognatus from central New Mexico is indistinguishable from topotypical S. holzneri from southeastern Arizona as well as populations from southwestern New Mexico, Chihuahua, and Sonora, Mexico. Cottontails previously referred to S. robustus, from the Guadalupe Mountains of New Mexico and Texas, southward in the mountains of western Texas, and the Sierra Madre Oriental to central Coahuila, Mexico, average larger in overall size and, on average, have proportionately larger auditory bullae and are referable to S. holzneri robustus. The relationship of S. holzneri to other mountain/plateau-inhabiting taxa, outside the study area in central and southern Mexico remains to be resolved.

Establishment of Cephalic Index Using Cranial Parameters by Computed Tomography in a Sampled North Indian Population.

Background: Cephalic index (CI) also called cranial index is the ratio of maximum breadth to a maximum length of head. The purpose of the study was to study anthropometry of cranial parameters using the computed tomography (CT) scans to establish the CI of the sampled population in North India.Materials and methods: The cross-sectional study was carried on the subjects of age group ranging from 6 to 95 years of either sex (total 1000 subjects; 540 male and 460 female) in the radio-diagnosis department of Era’s Medical College Lucknow, UP, India. The measurement of maximum cranial breadth (MCB) and maximum cranial length (MCL) were taken on a CT scan machine and recorded for analysis. When associating the measures of precision for different subgroups, a one-way analysis of variance (ANOVA) was used for modest and efficient errors. Multivariate logistic regression analysis was used to identify factors affecting the CI estimation like age, interzygomatic length (IZL), orbital length (OL), MCB, and MCL.Result: Out of 1000 studied subjects, the majority 234 (23.4%) of the subjects belong to the 21-30 years age group. MCB of heads and MCL of heads in different ages and on applying the one-way ANOVA association was statistically significant and CI was statistically insignificant. Pearson correlation between the CI and other parameters like age, MCB of heads, and MCL of heads, and a statistically significant correlation was seen with each other. Dolichocephalic types of the skull are found more in male subjects, and brachycephalic type of skull is more common in female subjects.Conclusion: The average CI of our study was 76.67±3.18. This shows that northern India's dominant head shape, especially in the Lucknow region, was dolichocephaly. Thus, the CT scan is proven an essential modality in the assessment of cranial parameters in anthropometry.

Skull Base Angle Morphometry in South Indian Population with Review on Terminology

Abstract Introduction Basal angle, Boogaard’s angle, and clival angle are frequently used in diagnosing the craniometric angle malformations either on radiography or now more on MRI. But anatomic and clinical studies have used varied terms for these parameters. We aimed to look for these parameters among a normal south Indian adult population to standardize the measurements and their terminology. Materials and Methods One hundred MRI images (50 males and 50 female) were studied retrospectively. MRI images that were reported as normal by neuroradiologist were taken up for the study. Mean and the standard deviation of males and females were calculated for basal angle, Boogaard’s angle, and clival angle, separately. Unpaired t-test was used to analyze the significant difference (p < 0.05) between the genders. The intraclass coefficient correlation was used to analyze the interobserver variability. Results The mean value of basal angle in males and females are 113°and 114°, respectively. The mean value of Boogaard’s angle in males and females are 120°and 121°, respectively. The mean value of clival angle in males and females are 157°and 155°, respectively. There was no statistically significant difference (p > 0.05) between males and females in all three angles. Conclusion Knowledge about the normal angles will be an important tool in understanding the normal and abnormal skull base. Since the type of skull varies in accordance with race, the normal craniometric angle also varies in accordance with race. The present study tried to standardize the parameters of normal skull base angles for appropriate correction of the anomalies and uniform usage of terminology.

Anatomical and morphometric evaluation of the orbit, eye tunics, eyelids and orbital glands of the captive females of the South African painted dog (Lycaon pictus pictus Temminck, 1820) (Caniformia: Canidae).

In this study, we present the first data concerning the anatomical, morphometrical, histological and histochemical study of the orbit, eye tunics, eyelids and orbital glands in South African Painted Dogs (Lycaon pictus pictus). The study was performed using eyeball morphometry, analysis of the bony orbit including its morphometry, macroscopic study, morphometry, histological examination of the eye tunics and chosen accessory organs of the eye and histochemical analysis. The orbit was funnel shaped and was open-type. There was a single ethmoid opening for the ethmoid nerve on the orbital lamina. The pupil was round, while the ciliary body occupied a relatively wide zone. The iris was brown and retina had a pigmented area. The cellular tapetum lucidum was semi-circular and milky and was composed of 14–17 layers of tapetal cells arranged in a bricklike structure. In the lower eyelid, there was a single conjunctival lymph nodule aggregate. One or two additional large conjunctval folds were observed within the posterior surface of the upper eyelids. The superficial gland of the third eyelid had a serous nature. The third eyelid was T-shaped and was composed of hyaline tissue. Two to three conjunctival lymph nodul aggregates were present within the bulbar conjunctiva of the third eyelid. The lacrimal gland produced a sero-mucous secretion. A detailed anatomic analysis of the eye area in the captive South African Painted Dogs females showed the similarities (especially in the histological examination of the eyetunics and orbital glands) as well as the differences between the Painted dog and the other representatives of Canidae. The differences included the shape and size od the orbita with comparison to the domestic dog. Such differences in the orbit measurements are most likely associated with the skull type, which are defined in relation to domestic dogs. The presented results significantly expand the existing knowledge on comparative anatomy in the orbit, eye and chosen accessory organs in wild Canidae.

Morphometric characteristics of latitude parameters of the middle cranial fossa of mature age human depending on extreme type of skull structure

The study of the structure, shape and size of the skull and its individual structures is in great demand not only from the point of view of expansion of knowledge of craniology, but also modern practical medicine. This is due to the rapid development of new methods for diagnosing pathological processes and the development of less traumatic methods of surgical treatment. The purpose of this study is to establish the size of the transverse parameters of the middle cranial fossa of a mature person depending on the three extreme types of skull. The research was conducted using a study of 50 craniotomograms and 50 bone preparations of the skull of men and women of mature age. The studied material was divided into three groups from the standpoint of studying individual anatomical variability. In order to achieve the goal of the study, the transverse parameters of the middle cranial fossa of mature people at different levels and from both halves were measured. The established indicators of transverse dimensions show that all latitudinal parameters tend to increase from the anterior parts of the middle cranial fossa to the posterior parts. The results of the study also show that the total latitudes and transverse dimensions of the left and right parts of the middle cranial fossa predominate in brachicrans and gradually decrease to dolichocrans with average values in mesocrans. This coincides with the fact that the brachycrane has a short and wide skull shape, the dolichocrane has an elongated and narrow one, and the mesocrane has average skull length and width values. The results of this study significantly supplement the existing information on the individual anatomical variability of the middle cranial fossa of a mature person and also allow more detailed application of these data in practical medicine.

Factors Associated with Shelter Dog Euthanasia versus Live Release by Adoption or Transfer in the United States

Simple SummaryUnited States animal shelters care for unwanted dogs until they are adopted, transferred to another facility, or euthanized. Previous studies have determined that certain phenotypic characteristics can be used to predict the outcome of shelter dogs. However, these earlier studies have typically been limited by sample size, shelter geographic location, and/or the number of shelters participating in the study, thus reducing generalized applicability of the results. The aim of this study was to test if certain characteristics of dogs in shelters predict the decision for those dogs to be euthanized rather than experience a live release by adoption or transfer. This study may be valuable to shelter staff because utilizing such phenotypic information can help shelter employees focus adoptability protocols, such as socialization and training programs, on dogs with a greater chance of being euthanized.The objective of this study was to identify phenotypic characteristics predicting the outcome of euthanasia for dogs entering shelters compared to live release. Individual dog records for 2017 were requested from shelters in five states (Mississippi, Pennsylvania, Michigan, Colorado, and Oklahoma) receiving municipal funding and using electronic records. Duplicate dogs were removed and records from 17 shelters were merged into a dataset of 25,047 unique dogs with variables of breed, gender, coat color, size, age, region, and time in shelter. Only data from dogs with the potential to be adopted (n = 19,514) were analyzed. From these data, a simple random sample of 6200 dogs was used for modelling. Variables describing coat length, estimated adult size, and skull type were imputed from the breed description. A Cox proportional hazard model with a random effect of shelter was developed for the outcome of euthanasia using manual forward variable selection and significance for variable retention at alpha = 0.05. A size by geographic region interaction was associated with the hazard of euthanasia (p = 0.0204). Additionally, age group and skull type were both associated with euthanasia compared to live release (p < 0.0001). The results of this study indicate that phenotypic characteristics of dogs are predictive of their hazard for euthanasia in shelters.

Comparison of computed tomographic ocular biometry in brachycephalic and non-brachycephalic cats.

Background and Aim:Ocular biometry has been used to evaluate ocular parameters; however, several factors need to be considered. In humans, age and sex have been shown to affect ocular biometry. The main factor that affects feline ocular biometry is the head circumference. At present, several reports have revealed that canine ocular biometry differs among dog breeds. However, there are no reports on normal ocular biometry in cats using computed tomography (CT). Therefore, this study aimed to explore feline ocular parameters between brachycephalic (B) and non-brachycephalic (NB) cats using CT and to evaluate the influence of age or sex of cats on ocular biometry.Materials and Methods:Twenty-four normal cats were divided into two groups: B (n=12) and NB (n=12). Each group had an equal number of designated males and females. CT was performed under mechanical restraint without general anesthesia and intravenous contrast enhancement. Ocular biometry, dimensions of the internal structure, including attenuation numbers and extra-ocular structures, were evaluated and compared.Results:B-cats had a significantly wider globe width (GW) than NB-cats (p<0.05). In addition, globe length (GL) and GW were significantly correlated with the age of the cats. Significant correlation between GL and age was observed in all cats (r=0.4867; p<0.05), NB-cats (r=0.8692; p<0.05), and B-cats (r=0.4367; p<0.05), whereas the correlation between GW and age was observed in B-cats only (r=0.7251; p<0.05). For extra-ocular structures, NB-cats had significantly greater orbital depth than B-cats (p<0.05), and orbital diameter was significantly correlated with age in all cats and B-cats (p<0.05).Conclusion:CT can be used for ocular biometric evaluation in cats with different skull types. GW was wider in B-cats, whereas the orbital depth was greater in NB-cats. Moreover, GW, GL, and orbital diameter were affected by the age of the cats. This information will be useful for further ocular diagnosis and treatment, especially in prosthetic surgical procedures.

NEUROIMAGING DATA OF THE STUDY OF THE CHIASMAL-SELLAR REGION STRUCTURES

NEUROIMAGING DATA OF THE STUDY OF THE CHIASMAL-SELLAR REGION STRUCTURES

Craniotopographic characteristics of the distances between the foramina of the middle cranial fossa taking into account the human craniotype

Annotation. It is known that within the middle cranial fossa there are rotundum, ovale and spinosum foramina through which important vessels and nerves pass. That is why it is important for surgeons not to damage them during surgery. The aim of the work was to establish the craniotopographic characteristics of the distances between the foramens of the middle cranial fossa of a mature person depending on the extreme types of skull structure. The morphometric study was performed on 50 CT scans of the adult human head using the anatomical imaging system Anatomage table, with the installed program Launching Table 6.0 Application and 50 bone preparations of the skull of adults in standard craniological methods using a common set of measuring instruments. In our study, craniometry was performed between the rotundum, ovale and spinosum foramina of the middle cranial fossa. Statistical processing of the obtained digital material was performed by the variation-statistical method with the determination of the Mann-Whitney criterion (p&lt;0.05). The performed morphometry showed there is a slight asymmetry of the distances between the foramens of the left and right parts of the middle cranial fossa. The study also showed that there is no significant difference in the average size between the foramens in the left and right halves of the middle cranial fossa depending on the extreme types of skull. The length between the foramina of the same name (rotundum, ovale and spinosum) is characterized by a gradual increase in parameters from dolichocranes to brachycranes, combined with an increase in latitudinal size in brachycranes, average values in mesocranes and a decrease in transverse parameters in dolichocranes. The obtained results complement the existing information on craniotopographic and craniometric features of the middle cranial fossa and can be the basis for further research.

A revision of skull morphology in Phorusrhacidae (Aves, Cariamiformes)

ABSTRACT Phorusrhacidae, popularly known as ‘terror birds’, are the most speciose clade within the avian order Cariamiformes, with a fossil record that ranges from the Eocene to the Pleistocene. Although several species have preserved skulls, our understanding of their cranial morphology remains incomplete. Here, a comprehensive overview of the current knowledge of phorusrhacid skull anatomy is presented. The phorusrhacid skull bauplan includes salient features such as deep, triangular fossae temporales, a complex basipterygoid articulation and the loss of bending zones related to kinesis. Two skull morphotypes can be discriminated: the psilopterine and the ‘terror bird’ type. The ‘terror bird’ skull type is here considered an evolutionary specialization, indicating that among phorusrhacids, medium-size to large phorusrhacids show more rigid and stiffer skulls. Nevertheless, studies have shown that the two morphotypes may have handled prey in a similar manner, suggesting that a trophic specialization with a unique hunting technique was the key driver of the evolution of the phorusrhacid skull.

EVALUATION OF CEPHALOMETRIC ANALYSIS IN PATIENTS WITH BILATERAL CONDYLAR RETROPOSITION IN TEMPOROMANDIBULAR DYSFUNCTION

Relevance. During the dentoalveolar growth and development, the direction and growth type of facial skull play a very important role. Development of esthetical symmetry, functional relationship, and clinical disharmony depends on skull parameters. Temporomandibular joint dysfunction is one of the most common diseases nowadays. That is why early identification of risk factors is among the priorities. This study aimed at evaluating occlusional and skeletal specific characteristics in patients with temporomandibular joint dysfunction, comparing different cephalometric findings and CT findings relating to condylar position. Materials and methods. The study included 45 individuals. The study group consisted of 26 patients with bilateral condylar retroposition. Control group was made up of 19 patients. The participants underwent clinical examination, functional testing, palpation of masticatory muscles, occlusion diagnosis by applying Baush articulating film 200,100,8 microns, cephalometric analysis: Tweed, Kim, Jarabak, Ricketts, computed tomography of temporomandibular joint. Statistical analysis was carried out by the program IBM SPSS Statistic Base v.22. Results. There were no pathological contacts during evaluation of static and dynamic occlusion, laterotrusion as «canine guidance». The patients of the test group had bilateral posterior joint fissure reduced right-median 1,96, left-median 1,81. In control group the position was right-average 2,75 and left-median 2,67 The patients in the control and test groups the indices Tweed &lt;FMA average were 19,6°/ median 21,7°; &lt;IMPA average 97,9°/ median 97,8°; Kim ODI median was 68,9°/73,74°; Ricketts Overbite median 2.1 mm /1,9 mm, Overjet median was 2,9 mm /2,85 mm, PM-Xi-ANS median was 44,1°/43,75°, &lt;NPog-FH median was 91°/86,85°,&lt;NBa-PtGn median was 91,1°/90,1°, &lt;MeGo-FH median was 18,7°/22,4°; Jarabak &lt;N-S-Ar average was 127,2°/125,6 °. Conclusions. In the patients with bilateral condylar retropositionm the joint fissure is reduced. Cephalometric analysis demonstrated the following: Tweed &lt;FMA, &lt;IMPA; Kim ODI; Ricketts Overbite, Overjet, PM-Xi-ANS, &lt;MeGo-FH; Jarabak &lt;N-S-Ar can not be used as diagnostic criteria of bilateral condylar retroposition. Ricketts &lt;NPog-FH in the test group showed the mandibular retroposition, but with normal type of mandibular growth &lt;NBa-PtGn. It can be used as one of the primary cephalometric diagnostic indicator of bilateral condylar retroposition.

Phenotypic Characteristics Associated with Shelter Dog Adoption in the United States.

Simple SummaryUnited States animal shelters care for unwanted dogs until they are adopted, transferred to another facility, or euthanized. Certain characteristics have been previously studied to determine the adoptability of shelter dogs possessing such traits. However, previous studies are typically limited in sample size, shelter geographic location, and/or the number of shelters participating in the study; these reduce the generalizability of the results. To better understand predicters of shelter dog adoptability, the aim of this study was to identify dog characteristics predictive of adoption. This study helps us understand adopters’ preferences for certain shelter dogs, which may be useful to help shelters increase adoption rates and ultimately reduce shelter dog euthanasia.The objective of this study was to identify phenotypic characteristics of dogs predictive of adoption after being received into a shelter. Individual dog records for 2017 were requested from shelters in five states that received municipal funding and utilized electronic record keeping methods. Records from 17 shelters were merged into a dataset of 19,514 potentially adoptable dogs. A simple random sample of 4500 dogs was used for modelling. Variables describing coat length, estimated adult size, and skull type were imputed from breed phenotype. A Cox proportional hazard model with a random effect of shelter was developed for the outcome of adoption using manual forward variable selection. Significance for model inclusion was set at alpha = 0.05. Dogs from shelters in the North were more likely to be adopted than dogs from shelters in the South (hazard ratio (HR) = 3.13, 95% C.I. 1.27–7.67), as were dogs from Western shelters versus those from Southern shelters (HR = 3.81, 95% C.I. 1.43–10.14). The effect of estimated adult size, skull type, and age group on adoption were each modified by time in the shelter (p < 0.001). The results of this study indicate that what dogs look like is predictive of their hazard for adoption from shelters, but the effect of some characteristics on hazard for adoption depend on time in the shelter. Further, this study demonstrates that adopters prefer a certain phenotype of shelter dog including those that are puppies, small sized and not brachycephalic, when accounting for time in the sheltering environment.

Individual variability of the brain hemispheres’ and occipital lobes’ width

200 hemispheres of the brain of people who died from diseases not related to brain pathology were studied. Morphometric method was used and statistical analysis was completed. It was found out that the width of the right and left hemispheres of the brain in both men and women of brachycranial skull type is slightly greater than of mesocranial and dolichocranial ones. Men and women with dolichocranial skull type have the width of the left hemisphere greater than the right one. Men have the width of the left and right hemispheres greater than women. The limits of individual variability of brain hemispheres’ and occipital lobes’ width have been determined taking into account the type of skull and sex. The largest indicators of the cerebral hemispheres’ width are the next: men of the brachycranial skull type have the right hemisphere’s width of the 70.6•10^-3 m, left one of the 71.4•10^3 m width; the women of the brachycranial skull type have the right hemispheres’ width of the 63.4•10^-3 m and the left one of the 63.8•10^3 m, the women of the mesocranial skull type have the left hemisphere’s width of 63.7•10^3 m. The smallest indicators of the cerebral hemispheres’ width are: men of the dolichocranial skull type have the width of the right hemisphere 44•10^3 m, of the left one of the dolichocranial skull type and of the brachycranial skull type have the width 43.8•10^3 m; women of the dolichocranial skull type have the width of the right hemisphere 38.5•10^3 m, left one of 42.5•10^-3. The largest indicators of the occipital lobes’ width are: men of the brachycranial skull type have the width of the right hemisphere 56•10^3 m, men of the mesocranial skull type have the width of the left hemisphere 65•10^3 m; women of the dolichocranial skull type have the right hemispheres’ width 58•10^-3 m, of mesocranial skull type have the left one is of 63•10^-3 m and of dolichocranial it is of 62.5•10^3 m. The smallest indicators of the occipital lobes’ width are: men of the dolichocranial skull type have the width of the right lobe 41•10^3 m, of mesocranial and brachycranial types it is 42•10^3 m, the width of the left lobe in men with dolichocranial skull type of 38•10^3 m; women of the mesocranial skull type have the right lobe’s width of 36•10^3 m, the left one of dolichocranial skull type it is of 34•10^-3 m. Keywords: endbrain, occipital lobe, individual anatomical variability.

Individual variability of the brain occipital lobes height and their blood supply

200 hemispheres of the brain of people who died from diseases not related to brain pathology were studied. The morphometric method was used and statistical analysis was performed. It was found that men and women with dolichocranial type of skull have an asymmetry in the height of the hemispheres of the brain. In men, the height of the left hemisphere of the brain is greater than in women, but the height of the right hemisphere of the brain in men is less. The height of the left hemisphere of the brain in men with mesocranial type is greater than the right, in women the height of the right hemisphere of the brain prevails. In people with brachycranial type of skull, the height of the left hemisphere of the brain prevails in men, in women the height of the right and left hemispheres of the brain are the same. According to the dolichocranial type of skull, the height of the left occipital lobe predominates in men, and the height of the right occipital lobe predominates in women. The height of the left occipital lobe in men with mesocranial type of skull is greater than the right. In women with mesocranial type of skull, the height of the left occipital lobe predominates. In people with brachycranial type of skull, the height of the right occipital lobe of the brain prevails in both men and women. The height of the cerebral hemispheres in men and women with brachycranial type of skull is greater than in those with mesocranial and dolichocranial. The height of the occipital lobes of the brain in men and women with dolichocranial type of skull is slightly higher than in those with mesocranial and brachycranial. Sources of blood supply to the formations of the medial surface of the occipital lobe of the brain - the branches of the posterior cerebral artery, which are divided according to their areas of blood supply to the parieto-occipital, calcarine spur and cuneus. Keywords: endbrain, occipital lobe, individual anatomical variability.

Structural features of the anterior region of the mandible

The research aims were to find out further intraosseous mandible organization indications and to structure it systematically. Material and methods: in our research 400 mandibles were used: for the intraosseous examinations in total 300 mandibles of persons aged 20–65 were used. For all corpses cephalic index was measured. Segmentation of the mandibles were made by Jigley saw between medial root of the first molar at one side and central and second incisor of the opposite one. After that segments were stained with Schiff's reagent with following preparation. Dry preparations (n = 100) were used in exploration of mental foramen macroanatomy. Results: mental foramen cavity depth was divided into three types: low, n = 33 (depth 269 ± 081 mm), medium, n = 36 (depth 358 ± 092 mm) and deep, n = 31 (depth 417 ± 036 mm); transverse size of the cavity is 3109 ± 041 mm and longitudinal size is 397 ± 055 mm. According to the mandible anterior intraosseous organization research it is possible to make a mental nerve intraosseous canal types systematization: semi-oval; straight; s-shaped type, formed by two opposite and transient bends. The S-shaped type (49%) is more common in persons with a dolichocephalic skull type, especially (57.55%) in mesocephalic type and semi-oval (66.36%) in brachycephalic type. Conclusion: nerve in the eponymous mental foramen, (which we would like to call a cavity), is branched into two large branches: the extraosseous branch, which innervates the soft tissues (such as Rr. mentales, Rr. labiales and Rr. gingivales), and the intraosseous branch, which runs from the mental foramen to the symphysis, from the latter branch to the first premolar, to the canine and to the incisors.

Low Field MRI Measurements of the Normal Canine Trigeminal Nerve.

There is no available measuring protocol and reference range for the normal canine trigeminal nerve. This can be problematic in cases of suspected bilateral trigeminal neuropathy since contralateral nerves cannot be a usefully compared. Trigeminal nerves and brain measurements were retrospectively assessed via multiplanar reconstruction (MPR) of 3DT1 post-contrast MR sequences from 137 dogs with no signs or diagnosis of trigeminal disease. Direct measurements of vertical brain height (BH), trigeminal nerves transverse height (TTH) and trigeminal nerves width in dorsal reconstruction (TDW) were made in a plane immediately caudal to the foramen ovale and used to derive trigeminal nerve-to-brain (NB) ratios, including height-to-brain ratio (HBR) and width-to-brain ratio (WBR). HBR (0.09, IQR = 0.08-0.09) and WBR (0.10, IQR = 0.09-0.11) maintained more consistent values across the study population compared to direct measurements of TTH (3.72, IQR = 3.42-4.07) and TDW (4.35 +/− 0.63). Calculated normal reference intervals for HBR and WBR were 0.07-0.11 and 0.08-0.13, respectively and the largest NB ratios recorded in normal dogs were 0.13 and 0.14 for HBR and WBR, respectively. All measurements varied proportionally with weight, including HBR (r = 0.41, p < 0.0001) and small dogs had a significantly smaller HBRs compared to medium (p = 0.0294), large (p < 0.0049) and giant dogs (p < 0.0044). Median HBR was the same across skull types (0.09), however post-hoc analysis detected significantly smaller HBRs in brachycephalic compared to mesaticephalic dogs (p = 0.0494). In conclusion, trigeminal NB ratios may allow for accurate, objective assessment of the canine trigeminal nerves on MRI but further quantification of the effects of weight and skull type on suggested reference intervals is needed.