. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE BRANCHIAL EPITHELIAL BODIES 297 thm IV thyreoid, forming what have been termed the parathyreoid bodies (Fig. 179, pth1 and pth2). One of these pairs arises as a thickening of the dorsal portion of the fourth branchial groove and the other comes from the corresponding portion of the third groove. The members of the former pair, after separating from their pthm IV points of origin, come to lie on the dorsal surface of the lateral sd ^v^B — pthm ill portions of the thyreoid body (Fig. 180, p
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE BRANCHIAL EPITHELIAL BODIES 297 thm IV thyreoid, forming what have been termed the parathyreoid bodies (Fig. 179, pth1 and pth2). One of these pairs arises as a thickening of the dorsal portion of the fourth branchial groove and the other comes from the corresponding portion of the third groove. The members of the former pair, after separating from their pthm IV points of origin, come to lie on the dorsal surface of the lateral sd ^v^B — pthm ill portions of the thyreoid body (Fig. 180, pthm IV) in close proximity to the lateral thy- reoids, while those of the other pair, passing further backward, come to rest behind the lower border of the thyreoid (Fig. 180, pthm III). The cells of these bodies do not become divided into cords by the ingrowth of connective tissue to the same extent as those of the thyreoids, nor do they become separated into follicles, so that the bodies are readily distinguishable by their structure from the thy- reoid. From the ventral portion of the third branchial groove a pair of evaginations develop, similar to those which produce the lateral thyreoids. These elongate greatly, and growing down- ward ventrally to the thyreoid and separating from their points of ori- gin, come to lie below the thyreoids, forming the thymus gland (Fig. 179, thy). As development proceeds they pass further backward and come eventually to rest upon the anterior surface of the peri-. thm HI Fig. 180.—Thyreoid, Tyhmtjs and Epithelial Bodies of a New-born Child. pthm 111 and pthm IV, Para thyreoids; sd, thyreoid; thm III, thymus; thm 7T", lateral thyreoid.—(Groschuff.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia
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Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
