How is the embryology of the thyroid?

Evagination of the pharyngeal embryonic epithelium migrating from thyroglossal duct at base of the tongue to its final position Anomalies that may occur are heter-ectopia (lingual thyroid, retrosternal thyroid and intratracheal thyroid) Another anomaly which is the most common one the thyroid cyst (Cyst at the cervical midline level in front of the trachea, 2-3 cm mucinous/clear liquid, lined by epithelia (squamous) and thyroid tissue)