Thyroid Gland Histology:

Is composed of hollow, spherical follicles

The walls of each folicle are formed by cuboidal or squamous epithelial cells called follicle cells

Produce the glycoprotein thyroglobulin the central lumen of the follicles stores colloid

Colloid is composed of thyroglobulin molecules with attached iodine atomes

TH is derived from iodinated thryroglobulin

Parafollicular cells  calcitonin hormone