. The American journal of anatomy . condition appears to be the peculiar doublingof the vena cava inferior in a dog, recorded and figured by Kerck-ring in 1670. After a long series of observations on the cat,carried out with admirable thoroughness, Huntington, McClureand Darrach have elaborately classified the variations in thisanimal. Other observations include those of Hall on the rabbit,Korosky on the dog, Phisalix and Zumstein on the guinea-pig,Keith on gibbons, and other observers upon development andvariations in many forms. A study of the reported cases reveals interesting difficulties
. The American journal of anatomy . condition appears to be the peculiar doublingof the vena cava inferior in a dog, recorded and figured by Kerck-ring in 1670. After a long series of observations on the cat,carried out with admirable thoroughness, Huntington, McClureand Darrach have elaborately classified the variations in thisanimal. Other observations include those of Hall on the rabbit,Korosky on the dog, Phisalix and Zumstein on the guinea-pig,Keith on gibbons, and other observers upon development andvariations in many forms. A study of the reported cases reveals interesting difficulties inregard to nomenclature and classification. There are, on onehand, cases in which the vena cava inferior is said to be doublewhen the normal single vessel is but partially developed and, onthe other hand, the vena cava inferior is said to be absent whenthe component parts are all present save one. This recallsProfessor Dwights query, What constitutes the vena cava in- 395 396 ALEXANDER S. BEGG ^ ???3 VCfKVA INFER-. l;. f1^ t :«» ?^ I WL-^ m ^:i I-. am I 1/ SIN. Fig. 1 The heart, liver, and associated veins of a i)ig six weeks after a dissection of an injected specimen. Reduced approximately 5. , pulmonary artery; V. hemiaz., hemiazygos (or left azygos) vein; V. port.,portal vein; V. ren. sin., left renal vein; V. spl., splenic vein. ABSENCE OF THE VENA CAVA INFERIOR 397 ferior? Dwight believed that the vein which extends throughthe diaphragm to empty into the lower part of the atrium is theinferior cava, regardless of the arrangement of its abdominaltributaries. If the vein, as in certain abnormal cases, receivesonly the branches from the liver, and if this vein is called thecommon hepatic vein (following Kaestner, 00), then consist-ency requires that in normal cases the cava be described as emp-tying into the common hepatic vein and not into the w^ork of Lewis, however, on rabbits has fully established
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectanatomy, bookyear1920
