The thyroid gland, usually located below and anterior to the
larynx, consists of two bulky lateral lobes connected by a
relatively thin isthmus. The thyroid is divided by thin brous
septae into lobules composed of about 20 to 40 evenly
dispersed follicles, lined by a cuboidal to low columnar
[1] epithelium, and lled with PAS-positive thyroglobulin. The
thyroid secretes hormones that control the heart rate, blood
pressure, body temperature and basal metabolic rate