Abstract
Background: The thyroid gland is essential for normal growth of the body. This study assessed relation of external branch of superior laryngeal nerve to the superior pole of the thyroid gland. Subjects and Methods: This study was conducted on 25 human cadavers having 50 superior thyroid poles of both genders. Cadavers were classified based on age groups, group I was those with age less than 39 years and group II cadavers were those with age more than 40 years of age. Various measurements were performed on cadavers. Results: 14 cadavers were I group I and 11 were in group II. The mean mass was 67.2 Kgs in group I and 59.5 Kgs in group II, time elapsed after death was 481.5 minutes in group I and
 476.4 minutes in group II, mean height was 1.74 meters in group I and 1.69 meters in group II, mean BMI found to be 22.3 kg/m2in group I and 20.1 kg/m2in group II. Height found to be significant between both groups (P< 0.05). The mean distance from EBSLN to cranial point of the thyroid gland was 6.66 mm in group I and 8.96 mm in group II. The mean transverse distance from superior thyroid artery to EBSLN was 3.55 mm in group I and 5.12 mm side in group II. The mean distance of the crossing point between the most cranial point of the thyroid lobe was 6.40 mm in group I and 11.47 mm in group II. The mean distance from the EBSLN to the midline of the neck was 19.80 mm in group I and 18.58 mm in group II. The mean distance from the EBSLN to the midline of the neck on the most cranial point of the cricoid cartilage was 18.77 mm in group I and 17.80 mm in group II. Conclusion: Authors found variation in measurements in left and right side in both group I and group II.
Highlights
The thyroid gland is present in neck
It is very important gland essential for normal growth of the body. It is closely linked with multiple anatomic landmarks in the neck which comprise of cervical part of esophagus, the recurrent laryngeal nerve, superior laryngeal nerve and parathyroid glands
We found that the mean mass was 67.2 Kgs in group I and 59.5 Kgs in group II, time elapsed after death was 481.5 minutes in group I and 476.4 minutes in group II, mean height was 1.74 meters in group I and 1.69 meters in group II, mean BMI found to be 22.3 kg/m2 in group I and 20.1 kg/m2 in group II
Summary
The thyroid gland is present in neck It is very important gland essential for normal growth of the body. It is closely linked with multiple anatomic landmarks in the neck which comprise of cervical part of esophagus, the recurrent laryngeal nerve, superior laryngeal nerve and parathyroid glands. [3] It has been observed that there are chances of palsy of cricothyroid muscle during injury to the external branch of the superior laryngeal nerve (EBSLN). Chances of injury to EBSLN are more are the distance between it and superior pole of the thyroid gland is less. The present study was conducted to determine relation of external branch of superior laryngeal nerve to the superior pole of the thyroid gland
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