. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 316 THE DEVELOPMENT OF THE CHICK cloacal membrane, is the neck of the allantois, and dorsal to this, the large intestine. Though not shown in the figure, it may be noted that the Wolffian ducts open into the cloaca behind and dorsal to the opening of the rectum. The appearance of the cloaca in a longitudinal section does not, however, give an adequate idea of its form. The anterior portion of the cloaca which receives the rectum, stalk of the allantois and Wolffian ducts is expanded considerably in
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. 316 THE DEVELOPMENT OF THE CHICK cloacal membrane, is the neck of the allantois, and dorsal to this, the large intestine. Though not shown in the figure, it may be noted that the Wolffian ducts open into the cloaca behind and dorsal to the opening of the rectum. The appearance of the cloaca in a longitudinal section does not, however, give an adequate idea of its form. The anterior portion of the cloaca which receives the rectum, stalk of the allantois and Wolffian ducts is expanded considerably in the lateral plane, and thus possesses a large cavity. The posterior â â â â «-'. Fig. 184. â Frontal section through the region of the cloaca of a 5^-day chick embryo. an. F., Anal fokl. B. F., Bursa Fabricii. CI., Cloaca. Coel., Coelome. Rect., Rectum. W. D., Wolffian duct. X., Posterior angle of the body-cavity; the epitheHum is invaginated and folded so as to simulate a glandular structure. portion, on the other hand, is greatly compressed laterally and the cavity is extremely narrow. During the fifth day the walls of this part of the cloaca become actually fused together, and its cavity obliterated, or rendered virtual only (Fig. 184). Thus the anterior part of the cloaca is prolonged backwards by a. 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
