Figure 17 - Carnegie Inst Wash 24:93142, 1933.) As the...

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Figure 17. Stages in the development of the thyroid gland. A , 1, Thyroid primordium and pharyngeal epithelium of a 4.5-mm human embryo; 2, section through the same structure showing a raised central portion; B , 1, Thyroid primordium of a 6.5-mm embryo; 2, section through the same structure; C , 1, Thyroid primordium of an 8.2-mm embryo beginning to descend; 2, lateral view of the same structure; D , Thyroid primordium of an 11-mm embryo. The connection with the pharynx is broken, and the lobes are beginning to grow laterad; E , Thyroid gland of a 13.5-mm embryo. The lobes are thin sheets curving around the carotid arteries. Several lacunae, which are not to be confused with follicles, are present in the sheets. (From Weller GL: Development of the thyroid, parathyroid and thymus glands in man. Contrib Embryol
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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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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Figure 17 - Carnegie Inst Wash 24:93142, 1933.) As the...

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