84 THE POCKET ANATOMY 



Behind. Duodenum, 3rd part, and left renal vein. Sur- 

 rounded by mesenteric plexus of nerves and accompanied by 

 its vein, which lies anterior and to right. 



Branches : 



Inferior Pancreatico- duodenal : directed from left to right 

 along concave border of 3rd part of duodenum ; anas, superior 

 pancreatico-duodenal. 



Vasa intestini tennis : to supply jejunum and ileum, twelve 

 or fifteen in number ; spring from left convex side of artery ; 

 about 2 inches from origin they bifurcate, each division 

 uniting with a neighbouring branch to form an arch, 

 from which branches issue ; these divide and communicate 

 in the same way four or five times, the resultant branches 

 proceeding directly to intestine. 



Ileo-colic: from right side of artery down to caecum, branch- 

 ing to supply head of colon. A descending branch to lower 

 part of ileum. An ascending to ascending colon and anas. 

 with right colic. 



Right colic (often a branch of ileo-colic) : from right side of 

 trunk to middle of ascending colon, ascending branch anas. 

 middle colic, descending branch anas, ileo-colic. 



Middle colic : passing forward in transverse meso-colon from 

 upper part of right side of artery, supplies transverse colon ; 

 right branch anas, right colic ; left branch anas, on descending 

 colon, with left colic of inferior mesenteric. 



Renal (2) : one from each side arising inch below superior 

 mesenteric, the right a little lower than the left one. Pass 

 outwards to supply kidneys, the right one passing behind 

 vena cava. Each divides near viscus into four or five 

 branches, which enter it between vein and ureter. Is ac- 

 companied by plexus of nerves, supplies branches to supra- 

 renal body (inferior capsular], ureter and fat around. 



Spermatic : two small but very long arteries ; arise just 

 below renal, directed downwards and outwards behind peri- 

 toneum over psoas, crossing ureter and external iliac artery 

 (the right one crosses also the inferior vena cava) to internal 

 abdominal ring, thence accompanied by spermatic vein, 

 spermatic plexus, and vas deferens, it passes along inguinal 

 canal, and out of the external ring to the scrotum, where it 

 divides into branches which enter the posterior surface of 

 the testis ; anas, artery of vas deferens and cremasteric. 



In the female the artery is termed ovarian, and runs 

 between layers of broad ligament of uterus, to ovary and 

 round ligament. 



Inferior mesenteric : arises on left side of aorta, about 



