. The development of the chick; an introduction to embryology. Birds -- Embryology. 318 THE DEVELOPMENT OF THE CHICK shadow its final rupture. The lower end of the large intestine is perfectly solid, and higher up, somewhat vacuolated. (The solid stage begins on the seventh day.) The urinogenital ducts open into the urodseum above the solid end of the large intestine. It will be seen, therefore, that the urodseum is transformed into a passageway between the urinogenital ducts and the allantois, being closed anteriorly by the solid large intestine and posteriorly by the urodseal (cloacal) membr
. The development of the chick; an introduction to embryology. Birds -- Embryology. 318 THE DEVELOPMENT OF THE CHICK shadow its final rupture. The lower end of the large intestine is perfectly solid, and higher up, somewhat vacuolated. (The solid stage begins on the seventh day.) The urinogenital ducts open into the urodseum above the solid end of the large intestine. It will be seen, therefore, that the urodseum is transformed into a passageway between the urinogenital ducts and the allantois, being closed anteriorly by the solid large intestine and posteriorly by the urodseal (cloacal) membrane. //cA Ufd. An. Fig. 185. — Piiotograph of the region of the cloaca in a median sagittal section of an 8-day chick. All., Allantois. An., Anus. B. F., Bursa Fabricii. caud. A., Caudal artery. Int., Intestine. N'ch., Notochord. p. P., Perianal papilla. Rect., Rectum. Ur'd., Urodseum. During the twelfth and thirteenth days, the vacuoles in the upper part of the large intestine flow together and re-establish the cavity, but the lower end still remains closed by a solid plug of cells; immediately anterior to the latter the large intestine is dilated, and this apparently corresponds to the coprodseum of. 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, Holt
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