We become to an important endocrine gland which is the thyroid gland. The thyroid gland is enclosed in a pre-trivial fascia. It consists of an isthmus in between and two lobes of the gland. Each lobe comprises of an upper apex of the gland and the lower base of the gland. It also has a superficial surface, postural lateral surface and a medial surface. The muscles related to superficial surface are the sternohyoid and the omohyoid. Along the postural lateral surface is the cathorted sheath containing the common cathorted artery, the vegas nerve and the internal jugular vein. The medial surface of the thyroid gland is related to two tubes that regia anteriorly and the esophagus posteriorly. It is also related to two muscles, the cricothyroid and the inferior constrictor muscles. Two nerves, the external laryngeal nerve and the recurrent laryngeal nerve. The isthmus of the gland lies opposite second third. Arrings of the trachea and it joins the right lobe of the thyroid gland with the left lobe of the thyroid gland. The thyroid gland is very vascular, it is supplied by the superior thyroid artery which is the first branch of the external carotid artery and also by the inferior thyroid artery which is a branch of the thyroid cervical trunk of the subclavian artery. Along the posterior border of the thyroid gland are two small p-shaped perathyroid glands. They are supplied by the anestimating branch between inferior thyroid artery and the posterior branch of the superior thyroid artery. The veins of the thyroid gland are superior thyroid vein, the additional middle thyroid vein and inferior thyroid vein.