GENERAL HISTOLOGY

Detailed explanation-1: -[5] The thyroid follicles are the structural and functional units of a thyroid gland. These are spherical, and the wall is made up of a large number of cuboidal cells, the follicular cells. These follicular cells are the derivates of the endoderm and secrete thyroid hormone.

Detailed explanation-2: -Thyroxine☆ Thyroxine (T4) is the main secretory product of the thyroid follicle cells and is converted to the active hormone, triiodothyronine (T3), in the tissues under the influence of microsomal deiodinase enzymes, which remove the iodine from the “outer” ring (5’-deiodination).

Detailed explanation-3: -The thyroid gland is covered by a thin fibrous capsule, which has an inner and an outer layer. The inner layer extrudes into the gland and forms the septa that divide the thyroid tissue into microscopic lobules.