Airway (Prenatal/Neonatal), Anatomy, Embryology, and Physiology of the

Figure 4 : Diagrammatic sketch showing the usual sites of ectopic thyroid tissue. (From Moore KL, Persaud TVN: The pharyngeal [branchial] apparatus. In Moore KL, Persaud TVN [eds]: Before We Are Born: Essentials of Embryology and Birth Defects, 5th ed. Philadelphia, Saunders, 1998:214.)

The thyroid gland begins development during the third week of fetal life as an endodermal thickening in the floor of the primitive pharynx, between the first and second pharyngeal pouches. With growth of the embryo, the thyroid tissue descends into t ...

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