. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . complete arches: thefourth clefts are shown on the left side. 3. The two anterior pairs of arches havedisappeared. -1. Transition to the final stage. A, aortic arch; ad, dorsal aorta;ax, subclavian or axillary artery; ft. external carotid; Ci. internal carotid; dB,ductus arteriosus Botalli; P. pulmonary artery; iff, subclavian artery; la, truncuaarteriosus; v, vertebral artery. The arrangement of the principal vessels in the bird, mam-mal, etc., is represented on page 110. In mammals t
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . complete arches: thefourth clefts are shown on the left side. 3. The two anterior pairs of arches havedisappeared. -1. Transition to the final stage. A, aortic arch; ad, dorsal aorta;ax, subclavian or axillary artery; ft. external carotid; Ci. internal carotid; dB,ductus arteriosus Botalli; P. pulmonary artery; iff, subclavian artery; la, truncuaarteriosus; v, vertebral artery. The arrangement of the principal vessels in the bird, mam-mal, etc., is represented on page 110. In mammals the two prim- 110 COMPARATIVE PHYSIOLOGY. itive anterior abdominal {allantoic) veins develop early andunite in front with the vitelline: hut the right allantoic veinand the right vitelline veins soon disappear, while the long com-mon trunk of the allantoic and vitelline veins {ductus venosus)passes through the liver, where it is said the ductus venosusgives off and receives branches. The ductus venosus Arantiipersists throughout life. (Compare the various figures illustrat-ing the circulation.) A ... .. B.
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