Spinal Α-motoneurons Research Articles

Enhancement in Ia-motoneuron synaptic transmission caudal to chronic spinal cord transection

ArticlesEnhancement in Ia-motoneuron synaptic transmission caudal to chronic spinal cord transectionS. G. Nelson, and L. M. MendellS. G. Nelson, and L. M. MendellPublished Online:01 May 1979https://doi.org/10.1152/jn.1979.42.3.642MoreSectionsPDF (2 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited BySequential therapy of anti-Nogo-A antibody treatment and treadmill training leads to cumulative improvements after spinal cord injury in ratsExperimental Neurology, Vol. 292Synchronous and asynchronous electrically evoked motor activities during wind-up stimulation are differentially modulated following an acute spinal transectionAlain Frigon, Marie-France Hurteau, Michael D. Johnson, C. J. Heckman, Alessandro Telonio, and Yann Thibaudier15 December 2012 | Journal of Neurophysiology, Vol. 108, No. 12Altered activation patterns by triceps surae stretch reflex pathways in acute and chronic spinal cord injuryAlain Frigon, Michael D. Johnson, and C. J. Heckman1 October 2011 | Journal of Neurophysiology, Vol. 106, No. 4Soleus H-reflex recruitment is not altered in persons with chronic spinal cord injury 11No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the authors(s) or upon any organization with which the author(s) is/are associated.Archives of Physical Medicine and Rehabilitation, Vol. 85, No. 5Comparative Psychology of Motor Systems15 April 2003Short-Term and Medium-Term Effects of Spinal Cord Tract Transections on Soleus H-Reflex in Freely Moving RatsJournal of Neurotrauma, Vol. 18, No. 3Changes in the distribution of synaptic potentials from bulbospinal neurones following axotomy in cat thoracic spinal cord13 August 2004 | The Journal of Physiology, Vol. 524, No. 1Incomplete spinal cord injury: Neuronal mechanisms of motor recovery and hyperreflexiaArchives of Physical Medicine and Rehabilitation, Vol. 80, No. 5Operant Conditioning of H-Reflex in Spinal Cord-Injured RatsJournal of Neurotrauma, Vol. 13, No. 12Lesions of Cat Sacrocaudal Spinal Cord: A Minimally Disruptive Model of InjuryJournal of Neurotrauma, Vol. 9, No. 3Correlative electrophysiological and behavioral evaluation following L5 lesions in the cat: A model of spasticityExperimental Neurology, Vol. 114, No. 2A physiological study of the monosynaptic reflex responses of cat spinal α-motoneurons after partial lumbosacral deafferentationBrain Research, Vol. 488, No. 1-2Serial recording of reflexes after feline spinal cord transectionExperimental Neurology, Vol. 93, No. 3Recovery of postural control following chronic bilateral hemisections at different spinal cord levels in adult catsExperimental Neurology, Vol. 90, No. 2Injury-induced plasticity of the flexor reflex in chronic decerebrate ratsNeuroscience, Vol. 16, No. 2Fetal locus coeruleus transplanted into the transected spinal cord of the adult rat: Some observations and implicationsNeuroscience, Vol. 12, No. 3Timecourse for receptive field plasticity following spinal cord hemisectionBrain Research, Vol. 279, No. 1-2Adaptive plasticity in the spinal stretch reflexBrain Research, Vol. 267, No. 1Long-lasting facilitation of a monosynaptic pathway as a result of “partial” axotomy of its presynaptic elementsExperimental Neurology, Vol. 79, No. 2Effects of chronic partial deafferentation on the electrical properties of lumbar α-motoneurones in the catBrain Research, Vol. 246, No. 1Increased receptive field size of dorsal horn neurons following chronic spinal cord hemisections in catsBrain Research, Vol. 216, No. 1Selectivity in synaptic changes caudal to acute spinal cord transectionNeuroscience Letters, Vol. 20, No. 3Fluctuations in time of onset of la-motoneuron EPSPs in the catBrain Research, Vol. 160, No. 3 More from this issue > Volume 42Issue 3May 1979Pages 642-654 Copyright & PermissionsCopyright © 1979 the American Physiological Societyhttps://doi.org/10.1152/jn.1979.42.3.642PubMed219161History Published online 1 May 1979 Published in print 1 May 1979 Metrics

Immediate increase in Ia-motoneuron synaptic transmission caudal to spinal cord transection

ArticlesImmediate increase in Ia-motoneuron synaptic transmission caudal to spinal cord transectionS. G. Nelson, T. C. Collatos, A. Niechaj, and L. M. MendellS. G. Nelson, T. C. Collatos, A. Niechaj, and L. M. MendellPublished Online:01 May 1979https://doi.org/10.1152/jn.1979.42.3.655MoreSectionsPDF (2 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInEmailWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformationCited BySynchronous and asynchronous electrically evoked motor activities during wind-up stimulation are differentially modulated following an acute spinal transectionAlain Frigon, Marie-France Hurteau, Michael D. Johnson, C. J. Heckman, Alessandro Telonio, and Yann Thibaudier15 December 2012 | Journal of Neurophysiology, Vol. 108, No. 12Altered activation patterns by triceps surae stretch reflex pathways in acute and chronic spinal cord injuryAlain Frigon, Michael D. Johnson, and C. J. Heckman1 October 2011 | Journal of Neurophysiology, Vol. 106, No. 4Plasticity of Spinal Cord Reflexes After a Complete Transection in Adult Rats: Relationship to Stepping AbilityIgor Lavrov, Yury P. Gerasimenko, Ronaldo M. Ichiyama, Gregoire Courtine, Hui Zhong, Roland R. Roy, and V. Reggie Edgerton1 October 2006 | Journal of Neurophysiology, Vol. 96, No. 4Short-Term and Medium-Term Effects of Spinal Cord Tract Transections on Soleus H-Reflex in Freely Moving RatsJournal of Neurotrauma, Vol. 18, No. 3Incomplete spinal cord injury: Neuronal mechanisms of motor recovery and hyperreflexiaArchives of Physical Medicine and Rehabilitation, Vol. 80, No. 5Alteration in Rate Modulation of Reflexes to Lumbar Motoneurons After Midthoracic Spinal Cord Injury in the Rat. I. Contusion InjuryJournal of Neurotrauma, Vol. 15, No. 7Effects of exercise and fetal spinal cord implants on the H-reflex in chronically spinalized adult ratsBrain Research, Vol. 729, No. 1The use of texture analysis for the discrimination of Nissl substance in neuronsJournal of Neuroscience Methods, Vol. 44, No. 2-3Quantitative assessment of phrenic nerve functional recovery mediated by the crossed phrenic reflex at various time intervals after spinal cord injuryExperimental Neurology, Vol. 111, No. 2Changes in the cerebello-cerebral response in the parietal cortex following ablation of the motor cortex in the cat: early occurrence and persistenceNeuroscience Research, Vol. 8, No. 1A physiological study of the monosynaptic reflex responses of cat spinal α-motoneurons after partial lumbosacral deafferentationBrain Research, Vol. 488, No. 1-2The dendrites of single brain-stem motoneurons intracellularly labelled with horseradish peroxidase in the cat. Morphological and electrical differencesNeuroscience, Vol. 22, No. 3Ventral root potentials of the cat's sacrococcygeal segments evoked by stimulation of intact and transected dorsal rootsExperimental Neurology, Vol. 96, No. 1Motoneuronal Activity of Cat Lumbar Spinal Cord Following Separation from Descending or Contralateral ImpulsesCentral Nervous System Trauma, Vol. 4, No. 4Strategies for modifying axonal growth, synaptic function, and recovery of neural function after injury to the central nervous system: A conference reportExperimental Neurology, Vol. 93, No. 1Recovery of postural control following chronic bilateral hemisections at different spinal cord levels in adult catsExperimental Neurology, Vol. 90, No. 2Wiring diagrams of functional connectivity in monosynaptic reflex arcs of the spinal cordNeuroscience Letters, Vol. 45, No. 2Timecourse for receptive field plasticity following spinal cord hemisectionBrain Research, Vol. 279, No. 1-2The effect of transection and cold block of the spinal cord on synaptic transmission between Ia afferents and motoneuronesNeuroscience, Vol. 9, No. 2Effects of chronic partial deafferentation on the electrical properties of lumbar α-motoneurones in the catBrain Research, Vol. 246, No. 1Increased receptive field size of dorsal horn neurons following chronic spinal cord hemisections in catsBrain Research, Vol. 216, No. 1Increased response to sural nerve input in the dorsal horn following chronic spinal cord hemisectionBrain Research, Vol. 208, No. 2Selectivity in synaptic changes caudal to acute spinal cord transectionNeuroscience Letters, Vol. 20, No. 3 More from this issue > Volume 42Issue 3May 1979Pages 655-664 Copyright & PermissionsCopyright © 1979 the American Physiological Societyhttps://doi.org/10.1152/jn.1979.42.3.655PubMed219162History Published online 1 May 1979 Published in print 1 May 1979 Metrics

Spontaneous phagocytosis of c-type synaptic terminals by spinal α-motoneurons in newborn kittens. An electron microscopic study

The cell bodies and proximal dendrites of spinal α-motoneurons were studied electron microscopically with the aid of serial sections during the first postnatal week in the cat. The observations suggested that some of the synaptic terminals of the so-called C-type on the cell bodies and dendrites are phagocytosed by the motoneurons during the first few days after birth. This finding is discussed in relation to the earlier demonstrated postnatal loss of synaptic terminals on the motoneurons after birth and differences demonstrated between different functional types of spinal motoneurons with respect to the number and distribution of C-type terminals in the adult cat.

Evidence for direct synaptic interconnections between cat spinal α-motoneurons via the recurrent axon collaterals: A morphological study using intracellular injection of horseradish peroxidase

By using intracellular injection of horseradish peroxidase into cat triceps surae α-motoneurons we have been able to trace the motor axons as well as the recurrent motor axon collaterals with their synaptic terminals both with the light and electron microscope. In addition to the expected projection to the ‘Renshaw cell area’, the triceps surae motor axon collaterals were frequently found to terminate within the motor nuclei, where at least some of the terminals made direct synaptic contact with triceps surae α-motoneurons.

Mechanism of disturbance of inhibitory electrogenesis in spinal ?-motoneurons in experimental local botulinus poisoning

The character of changes in postsynaptic inhibition in spinal α-motoneurons of cats was studied in the course of experimental local botulinus poisoning. At the beginning of development of the local paralytic syndrome a marked decrease in the amplitude of the reciprocal, and a smaller decrease in amplitude of the polysynaptic IPSPs was observed. On the appearance of total paralysis of the muscles from botulinus poisoning the reciprocal and polysynaptic IPSPs were inhibited even more, but they never disappeared completely and were never converted into depolarization potentials. During the development of the IPSP the synaptic permeability of the motneurons as a rule was reduced.

Effect of stimulation of mesencephalic structures on spinal motoneurons

1. All investigated mesencephalic structures have definite synaptic influences on spinal α-motoneurons. The red nucleus facilitates flexor and inhibits extensor motoneurons. The substantia nigra acts in the same way as the red nucleus on motoneurons, but with less marked reciprocity. The reticular formation and nucleus of Cajal excite all of the flexor and half of the extensor motoneurons. The tectum has a predominantly facilitatory influence on both flexor and extensor motoneurons. 2. Experiments with prior destruction of the red nucleus suggest that effects of the reticular formation and substantia nigra on spinal motoneurons may be transmitted through the red nucleus. 3. Comparison of the character of influences from the tectum, reticular formation, red nucleus, nucleus of Cajal and substantia nigra suggests that during evolutionary development of the motor system of the mesencephalon an increase in specialization of the individual structures takes place. This is manifested, in particular, by the appearance of reciprocal effects on flexor and extensor motoneurons.

CENTRAL EFFECTS OF CENTRIPETAL IMPULSES IN AXONS OF SPINAL VENTRAL ROOTS

CENTRAL EFFECTS OF CENTRIPETAL IMPULSES IN AXONS OF SPINAL VENTRAL ROOTS