CIRCULATORY SYSTEM 



785 



jug.d. . x 



subcl 



cav.sup.d. 



co el 



c. 



Fig. 447. 



Comparisons of heart and connecting blood vessels in the crocodiles and birds. 

 A, Dorsal view of Crocodilian heart. A.M., mesenteric artery ; Ad and As, aortic 

 arches ; D.C.d. and D.C.8., right and left ducts of Cuvier ; through which the venae 

 cavae enter the heart; LV., pulmonary veins; L.V.h. and R.V.h., left and right 

 atria ; P.d. and P.8., right and left pulmonary arteries ; S.d. and S.s., right and 

 left subclavian arteries ; Sp.i., region of the interseptal valves ; Tr.cc., common 

 carotid artery; V.C.C., Coronary vein; V.c.i., inferior vena cava. (After Rose.) 



B, Ventral View of Crocodilian Heart, anast., so-called dorsal anastomosis of 

 the two roots of the aorta ; anon.l. and anon.r,, left and right innominate trunks ; 

 ao.l., left aortic arch ; ao.d., dorsal aorta ; ao.r., right aortic arch ; atr.l. and 

 atr.r., left and right atria ; coel, coeliac artery ; lig.bot., Botalli's Ligament 

 ost.atr.v., atrio-ventricular opening ; pidm., pulmonary artery ; pan., foramen of 

 Panizzae ; sept.ao., aortic septum ; sept.ao.pulm., aortic-pulmonary septum ; sept, 

 ventr., ventricular septum ; ventr.l. and ventr.r., left and right ventricle. (After 

 Greil.) 



C, Heart and communicating vessels of bird. (Swan). anon, innominate 

 artery ; ao, aorta ; ao.b., aortic arch ; brach.a. and brach.v., brachial artery and 

 vein ; car, carotid artery ; cav.sup.a. and cav.sup.s., right and left superior venae 

 cavae ; coel, coeliac artery ; cut.abd.pect., cutaneous abdominal-pectoral vein ; jug.d. 

 and jug.a., right and left jugular veins ; Ing, lung ; mam.i., internal mammary 

 artery ; mes, mesenteric artery ; oes, oesophagus ; oes.i., inferior oesophageal artery ; 

 pulm.s., left pulmonary artery ; st.cl., sternoclavicularis artery ; subcl, subclavian 

 artery ; thor.inf. and thor.sup., thoracalis ( ) inferior and superior 

 arteries ; thyr, thyroid gland ; tr, trachea ; tr.car. f carotid trunk ; vert, vertebral 

 artery. (After Gadow.) 



