Wednesday, December 24, 2014

Thyroid gland anatomy

THYROID GLAND

Thyroid gland consists of large numbers of follicles filled with a proteinous secretory substance called colloid. The follicle is lined by single layer of cuboidal epithelial cells which becomes flattened in inactivate state and become tall columnar in active state.


                           Major constituent of colloid is thyroglobulin which contains the thyroid hormones within its molecules. It also contain mono-iodotyrosin , di-iodotyrosin, tri- iodotyrosin.

                          The thyroid gland has a blood flow about five times the weight of the gland each minute, which is a blood supply as rich as that of any other area of the body, with the possible exception of the adrenal cortex.
                         The thyroid gland begins to function from the midterm of fetal life.  Food , iodine deficiency in the mother diet may lead to hypo function of the thyroid in the fetus and its consequent hazards.