. The development of the chick; an introduction to embryology. Birds -- Embryology. A B. Fig. 208. — Reconstruction of the aortic arches of an 8-day embryo from a series of sagittal sections. A. Left side. B. Right side. A. o. m., Omphalomesenteric artery. Ao. A., Aortic (systemic) arch. Car., Carotid. D. a., Ductus arteriosus, d. Ao., Dorsal aorta, p. A., Pul- monary artery. S'cl., Subclavian artery. V., Valves of the pulmonary artery. quantity of blood; the principal function of the pulmonary arch is obviouslv in connection with the svstemic circulation. In other words, both sides of the hea
. The development of the chick; an introduction to embryology. Birds -- Embryology. A B. Fig. 208. — Reconstruction of the aortic arches of an 8-day embryo from a series of sagittal sections. A. Left side. B. Right side. A. o. m., Omphalomesenteric artery. Ao. A., Aortic (systemic) arch. Car., Carotid. D. a., Ductus arteriosus, d. Ao., Dorsal aorta, p. A., Pul- monary artery. S'cl., Subclavian artery. V., Valves of the pulmonary artery. quantity of blood; the principal function of the pulmonary arch is obviouslv in connection with the svstemic circulation. In other words, both sides of the heart pump blood into the aorta during embryonic life; after hatching, the duct of Botallus be- comes occluded as already noted, and the pulmonary circulation is then fully established. The Carotid Arch. With the retreat of the heart into the thorax, the internal and external carotids become drawn out into long vessels extending through the neck region. The internal carotids then become approximated beneath the vertebral centra. The stem of the external carotid forms an anastomosis with the internal carotid in the mandibular region, and then disappears,. 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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