. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. Sa FIG. 290. FIG. 291. FIG. 290.—Diagram of early relations of vertebral arteries in an amniote. av, vertebral artery; da, dorsal aorta; ec, ic, external and internal carotids; pa, pulmonary artery; ra, radix aortae; sa, subclavian. FIG. 291.—A, side view of developing anterior arteries oiLacerta, after van Bemmeln; the vertebral artery not developed behind; B, ventral view of the relations of the arteries at the base of the vertebrate brain, av, vertebral artery; b, basilar artery; cw, circle of Willis; d
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. Sa FIG. 290. FIG. 291. FIG. 290.—Diagram of early relations of vertebral arteries in an amniote. av, vertebral artery; da, dorsal aorta; ec, ic, external and internal carotids; pa, pulmonary artery; ra, radix aortae; sa, subclavian. FIG. 291.—A, side view of developing anterior arteries oiLacerta, after van Bemmeln; the vertebral artery not developed behind; B, ventral view of the relations of the arteries at the base of the vertebrate brain, av, vertebral artery; b, basilar artery; cw, circle of Willis; da, dorsal aorta; ec, ic, external and internal carotids; pa, pulmonary artery; ra, radix aortas; sa, segmental arteries; sc, subclavian; 2-6, aortic arches. early stages they are given off in pairs from the radices and the dorsal aorta, an artery on either side, extending laterally between each two successive myotomes (fig. 275). Many of these remain in a slightly modified condition and are called intercostal arteries (including lumbar and sacral arteries, etc., according to position). These usually become connected on either side (fig. 290), near their. 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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