The thyroid follicle (or thyroid vesicle) is the morpho-functional unit of the thyroid gland. The follicle is composed of an uni-stratified epithelium of follicular cells, which is producing thyroid hormones, disposed around a central lumen containing the colloid. The colloid is mainly composed of the precursor of thyroid hormones, the thyroglobulin. The thyroid follicle is a real trap of iodine, essential element to the functioning of the body; the ion iodide will be captured and stored in the colloid. The biosynthesis of thyroid hormones thyroxine (T4 ) and triiodothyronine (T3 ) can then take place from iodine coupling to thyroglobulin.
The thyroid follicle, outside a majority of follicular cells, contains 1 to 2 % of said parafollicular cells (or C cells) producing calcitonin. They do, however, have not contact with the colloid.
PREGNANCY and FIBROMYALGIA
Dr. Kurland Norbert If you have fibromyalgia and are contemplating pregnancy, it’s natural to wonder what impact your illness will have on your ability to