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Unformatted text preview: Carnegie Inst Wash 24:93142, 1933.) As the gland moves downward, it leaves behind a trace of epithelial cells known as the thyroglossal tract. From this structure both thyroglossal duct cysts and the pyramidal lobe of the thyroid develop. The mature thyroid gland may take on many different configurations depending on the embryologic development of the thyroid and its descent (Fig. 18). Figure 18. Variations of normal adult thyroid anatomy resulting from embryologic descent and division of the thyroid gland. (From Sedgwick CE, Cady B: Surgery of the Thyroid and Parathyroid Glands, 2d ed. Philadelphia, WB Saunders, 1980; adapted from Gray SW, Skandalakis JE: Embryology for Surgeons. Philadelphia, WB Saunders, 1972.)...
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