. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 212. Fig 213. Fig. 212.—The frogs heart, seen from the front, the aortic arches of the left side hav-ing been removed. (1 x 4.) ca, carotid; c. ffl, carotid gland; ao, aorta; an, rightauricle; au, left auricle; pr. c, vena cava superior; pt. c, vena cava inferior;p. cu, pulmo-cutaneous trunk; tr, truncus arteriosus: v, ventricle (Howes). Fig. 213.—The same, seen from behind, the sinus venosus having been opened up 10show the sinu-auricular valves. (1 x 4.) , pulmonary vein; s.
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 212. Fig 213. Fig. 212.—The frogs heart, seen from the front, the aortic arches of the left side hav-ing been removed. (1 x 4.) ca, carotid; c. ffl, carotid gland; ao, aorta; an, rightauricle; au, left auricle; pr. c, vena cava superior; pt. c, vena cava inferior;p. cu, pulmo-cutaneous trunk; tr, truncus arteriosus: v, ventricle (Howes). Fig. 213.—The same, seen from behind, the sinus venosus having been opened up 10show the sinu-auricular valves. (1 x 4.) , pulmonary vein; s. v, sinus veno-bus; va, sinu-auricular valve. Other lettering as in Fig. 212 (Howes). In the crocodile, however, the heart consists of four per-fectly divided chambers. Of the two aortic arches, one arisestogether with the pulmonary artery from the right ventricle,and, as it crosses over, the left communicates with it by a smallopening, so that, although the arterial and the venous bloodare completely separated in the heart, they intermingle outsideof this organ. In birds the circulatory system is sub
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
