Endocrine System

Thyroid and Parathyroid Glands

What are the two types of cells in the thyroid gland?

The main type of cells in the thyroid are follicular cells. These cells produce T4 (thyroxine) and T3 (triiodothyronine). Parafollicular cells are also found between the follicles in the thyroid gland. These cells are not as numerous as follicular cells. They produce the hormone calcitonin.

