ox THE VITELLIXE VEIX OF THE CAT. 



FRANKLIN DEXTER, M. D. 



Associate Professor of Anutoiny, Avatomical Laboratory, Harvard Medical School. 



With 8 Text Figures. 



Although the vitelline (omphalo-mesaraic) artery is synonymous with 

 the suiDerior mesenteric, yet the vitelline vein is not identical with the 



superior mesenteric vein. 



The artery, at all stages 

 of the animal's life, is 

 found in the mesentery 

 of the jejunum and 

 ileum. Fig. 1 is a trans- 

 verse section of a cat em- 

 bryo of 7.6 mm. The 

 section is published not 

 because it shows anything 

 which is unlcnown, but 

 because it happens to be 

 a fortunate section and 

 demonstrates at a glance 

 the course and relations 

 of this vessel. The artery 

 is seen in the mesentery 

 of the intestine; it 

 crosses the ileum, and 

 divides at its termina- 

 tion to surround the yolk 

 sac. 



LUV 



Fig. 1. Transverse section of a eat embryo 7.6 mm 



After the obliteration of this sac, that portion of the artery ventrad 

 to the intestine, lies in the tissue of the umbilical cord, and consequently, 

 fixes or anchors the loop of ileum which it crosses in the cavity of 

 the umbilical cord, until all other portions of the intestine have entered 

 the coelom proper. The artery then elongates, and thus finally allows 

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