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International Journal of Recent Trends in Science and Technology, ISSN 2277-2812 E-ISSN: 2249-8109
Volume 11, Issue 2, June 2014 pp 143-147
Multiple variations in the morphology of thyroid gland
Professor, Department of Anatomy, Narayana Medical College, Chinthareddypalem, Nellore, Andhra Pradesh, INDIA.
Academic Editor : Dr. Aher K.R.
Aim and Objective: This study is aimed to establish a preliminary data on the variation in the lobar pattern of thyroid gland Study Design: Descriptive type of study. Place and period of study: Department of Anatomy, Narayana Medical College, Chinthareddy palem, Nellore, from May 2011 to February 2014. Materials: Fifty embalmed formalin fixed cadavers were taken for the study from the anatomy dissection hall. Method: The samples were collected from the cadavers by “block dissection” and variations in the lobes and upper and lower limits of the lobes were observed and in situ and recorded. Results: The superior limit of the right and left lobes of the thyroid gland reached above the midpoint of the lamina of the thyroid cartilage in 12.8% and 15.4 % cases and was found at the level of that midpoint in 38.5% and 48.7% and 51.2% of cases in males and at the level of the midpoint in 54.5%, below the level of the midpoint in 36.4% and above the level of the midpoint in 9.1% and 18.2% , at the level of the midpoint in 54.5% and 54.5% and below the level of the midpoint in 36.4% and 27.3% of the cases in females respectively. 41.67% on the right and 48.33% on the left could not reach that midpoint of the thyroid cartilage. The inferior limit of the right and left lobes of the thyroid gland reached up to the 5th tracheal ring in 41% and 48.7%cases respectively and inferiorly up to the 6th tracheal ring in 59% and 51.3% of cases in males and up to the 5th tracheal ring in 36.4% and 45.5% and inferiorly up to 6th tracheal ring in 63.3% and 54.5% in female cases respectively. The isthmus was absent in 79.5% of cases in males and 72.7% of cases in females. The levator glandulae thyroidea was arising from the right lobe 11%, left lobe in 38% and isthmus in 38% of males. In females from the right lobe 0%,left lobe 1% and isthmus 1% of the cases respectively. The pyramidal lobe was arising from right lobe in 10%, left lobe in 36% and isthmus in 42% of the cases in males. In females the pyramidal lobe was arising from right lobe in 0%, left lobe in 5% and isthmus in 5% of the cases respectively. Conclusion: The present study is an approach to objective to increase the information pool and help the clinicians in their practice.