. The comparative anatomy of the domesticated animals. Veterinary anatomy. PLAN OF EARLY UTERINE OVUM. Within the external ring, or zona pellucida, are : the serous lamina, a ; the yolk, 6; and the incipient embryo, c. DIAGRAM OF OVUM AT THE FORMATION OF THE AMNION. a, Chorion; b, Yolk-sac; c, Embrvo ; d and e. Folds of the sei'ous layer rising up to form the amnion. The umbilical vesicle is filled with a granular fluid, which is conveyed, for the nutrition of the foetus, by the omphalo-mesenteric vessels. When this alimentary reserve is nearly expended, the allantois appears. The allantois co
. The comparative anatomy of the domesticated animals. Veterinary anatomy. PLAN OF EARLY UTERINE OVUM. Within the external ring, or zona pellucida, are : the serous lamina, a ; the yolk, 6; and the incipient embryo, c. DIAGRAM OF OVUM AT THE FORMATION OF THE AMNION. a, Chorion; b, Yolk-sac; c, Embrvo ; d and e. Folds of the sei'ous layer rising up to form the amnion. The umbilical vesicle is filled with a granular fluid, which is conveyed, for the nutrition of the foetus, by the omphalo-mesenteric vessels. When this alimentary reserve is nearly expended, the allantois appears. The allantois commences by a small enlargement, which is thrown out by the intestinal furrow on the inferior abdominal wall. This bud becomes elongated, and gradually enlarges by drawing the umbilical vessels to its border: appearing as a small vesicle that at length extends through the umbilicus, and spreads itself over the inner face of the chorion, between it and the amnion. This new organ is divided into two sacs by a neck—the urachus—at the umbilical ring; the internal is the smallest and forms the bladder, and the external, the most voluminous, constitutes the allantois 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 Chauveau, A. (Auguste), 1827-1917; Arloing, S. (Saturnin), 1846-1911; Fleming, George, 1833-1901, tr. New York : D. Appleton and Company, 549 & 551 Broadway
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