220 



Aorta aldominalis. 



566. The Vasa intestini tennis. 



The 16 18 intestinal arteries, Vasa intestini tennis, pass 

 between the two layers of the mesentery to the jejunum and ilium. Each 

 vessel divides into two branches, which unite with a similar branch on 

 each side, forming a series of arches. From these arches smaller bran- 

 ches arise, which again unite with similar branches from either side, 

 and thus a second series of arches is formed ; from these latter, a third 

 and even fourth or fifth series of arches are constituted, diminishing in 

 size the nearer they approach the intestine. 



From the terminal arches, numerous small vessels, the Ramuli 

 intestinales arise, which encircle the intestine, upon which they are distri- 

 buted, ramifying thickly between its coats. The Art. ilco-colica, collect dextra 

 and colica media also form a number of arches with each other, espe- 

 cially at the angles between the ascending and transverse colon, and 

 two or three between the transverse and descending colon. 



3. The inferior m e s c n t e r i c artery, Art. mcscnterica inferior, 

 divides soon after its origin into two branches : the Colica sinistra to the 

 descending colon, and the superior h a em o r r h o i d al artery to 

 the sigmoid flexure and rectum. These branches too, anastomose with 

 each other, forming arterial arches. 



