What is the Histological Structure of the Thyroid Gland?
The thyroid gland is composed of numerous thyroid follicles, each surrounded by a single layer of follicular cells. These cells synthesize and secrete thyroid hormones. The follicles contain a central lumen filled with colloid, a protein-rich substance containing thyroglobulin. Between the follicles are parafollicular cells (C cells), which secrete the hormone calcitonin.
