. Text book of zoology. Zoology. Pig. 328. Arterial arches of the U rode la: diagramiuatic. A larva, B radult, ao aorta, br gill (removed from the second and third arches), ca carotid, j) pul- monary artery, st conus arteriosus ; 1—1' first, 2 second, 3 third, 4—V fourth arterial arches, la—3a first—third afferent branchial arteries ; 16—36 first—third efferent branchial . arteries.—Orig. unite to form the aorta. The first, however, usually lose their connection with the others, and simply supply the head with blood; the fourth also generally become independent, and form only the pulmonary art
. Text book of zoology. Zoology. Pig. 328. Arterial arches of the U rode la: diagramiuatic. A larva, B radult, ao aorta, br gill (removed from the second and third arches), ca carotid, j) pul- monary artery, st conus arteriosus ; 1—1' first, 2 second, 3 third, 4—V fourth arterial arches, la—3a first—third afferent branchial arteries ; 16—36 first—third efferent branchial . arteries.—Orig. unite to form the aorta. The first, however, usually lose their connection with the others, and simply supply the head with blood; the fourth also generally become independent, and form only the pulmonary arteries; and the third arterial arches, in many cases, atrophy completely. When this occurs, and if at the same time the first and fourth arches have no connection with it, the aorta is formed by the second arterial arches only, which are better developed than the others. The aorta of Amphibia is sometimes formed by a single pair of arterial arches, sometimes by several. The Gymnophiona in the adult condition are very similar to the others; the vascular system of the larva is at present unknown. * In the larva of the Urodeles the afferent and efferent branchial arteries are con- nected by a small vessel at the base of the gill (anastomosis), and this enlarges at the 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 Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
