. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 177 Binall round dorsal, and long fissure-like ventral cleft at about the 40 s stage (Fig. 102). These close during the fifth day. The significance of the separate dorsal and ventral divisions of the visceral clefts is an interesting question. It is probable that the dorsal division had a special function, as they have a special connection with the branchial sense Fig. 102. — Reconstruction of the pharyngeal organs of the chick at the end of the fourth day
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 177 Binall round dorsal, and long fissure-like ventral cleft at about the 40 s stage (Fig. 102). These close during the fifth day. The significance of the separate dorsal and ventral divisions of the visceral clefts is an interesting question. It is probable that the dorsal division had a special function, as they have a special connection with the branchial sense Fig. 102. — Reconstruction of the pharyngeal organs of the chick at the end of the fourth day of incubation. (After Kastsch- enko.) a. a. 3, a. a. 4, a. a. 6, Third, fourth, and sixth aortic arches. Car. e., External carotid. Car. i., Internal carotid. G. Gn., Ge- niculate ganglion. G. n. X., Ganglion nodosum. G. pr., Gan- glion petrosum. ot., Otocyst. p. A., pulmonary artery. Th., Thyroid, v. P. 1, 2, 3, 4, First, second, third, and fourth visceral pouches. V, VII, VIII, IX, X, XII, Cranial nerves and ganglia. The fourth visceral pouch connects with the ectoderm at its dorsal end, about the 35 s stage, but no cleft develops. Its pos- terior wall develops an evagination (postbranchial body) which by some is considered to be a rudimentary fifth pouch, and which contributes to the formation of the thymus. (See Chap. X.). 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 Lillie, Frank Rattray, 1870-1947. New York : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
