An introduction to the study of the comparative anatomy of animals . r and back of the fore-limb. The shortsection lying between the union of the subscapular with theinternal jugular and the external jugular is generally dis-tinguished as the innominate vein. The single vessel formedby the union-of the external jugular and innominate is almostimmediately joined by a third large vein, the subclavian. Thesubclavian vein, which, as its name implies, lies under theclavicle and precoracoid, is itself formed by the union of twoveins—the brachial which brings blood from the fore-limb, andthe musculo-
An introduction to the study of the comparative anatomy of animals . r and back of the fore-limb. The shortsection lying between the union of the subscapular with theinternal jugular and the external jugular is generally dis-tinguished as the innominate vein. The single vessel formedby the union-of the external jugular and innominate is almostimmediately joined by a third large vein, the subclavian. Thesubclavian vein, which, as its name implies, lies under theclavicle and precoracoid, is itself formed by the union of twoveins—the brachial which brings blood from the fore-limb, andthe musculo-cutaneous, a very large vein which takes its originin the nose, runs straight backwards as far as the middle of thetrunk, receiving branches from the skin and muscles of theside of the body, and then turns sharply forwards to pass upthe ventro-lateral wall of the body and join the brachial. Thethree veins, external jugular, innominate, and subclavian, uniteto form the superior vena cava of their side of the body, a Digitized by Microsoft® ANATOMY OF THE FROG 53. Fig. 9. Diagram of the venous system of tjie Frog. The apex of theheart is turned forwards to show the sinus venosus. m^mandibular vein ; /, lingual vein ; //, internal jugular vein ;, subscapular vein ; Br, brachial vein ; C musculo-cutaneous vein ; VCS, vena cava superior ; VC I, inferiorvena cava ; H, hepatic veins ; P, femoral vein ; Sc, sciaticvein; RA, renal portal vein;.?Vc, ramus communicansiliacus; A A P, anterior abdominal vein, formed by theunion of two pelvic veins ; P, portal vein. The pulmonarycirculation is not represented in the figure. Digitized by Microsoft® 54 COMPARATIVE ANATOMY wide vessel which runs into an anterior angle of the sinusvenosus. The systems of the right and left venae cavaeanteriores are similar, and the above description serves foreither side of the body. There are, then, two anterior ven^ cavas opening into thetwo anterior angles of the triangular sinus venosus. But thereis
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