110 ANATOMY. 



transverse colon. Arising about one-fourth inch below the cceliac axis, 



it arches forwards, downwards, and to the left, giving off 

 Inferior Pancreatico-duodenal. Ileo-colic. 



Vasa Intestini Tenuis. Colica Dextra and Media. 



Inferior Mesenteric^ supplies the descending colon, sigmoid flexure, and 



most of the rectum, giving off the following branches : 



Colica Sinistra. Sigmoid. Superior Hemorrhoidal. 



Supra-renal? arise one on each side, opposite the origin of the superior 



mesenteric, passing to the supra-renal capsules. 

 Renal? one from each side, just below the preceding, pass to the kidney, at 



the hilum having the middle place between the ureter behind and the 



renal vein in front. U. A. V. (you 'ave!) 

 Spermatic^ one on each side, in the male through the inguinal canal to 



the testes; in the female to the ovaries, uterus, and the skin of the labia 



and groins. 

 Lumbar? usually 4 on each side, analogous to the intercostals. They each 



divide into two branches, the 



Dorsal, giving off a spinal branch. Abdominal. 



Middle Sacral^ arises just at the bifurcation of the aorta ; it descends along 



the sacrum and coccyx, giving off numerous branches. 



Describe the Common Iliac Arteries. They extend from the bifurcation 

 of the aorta at the 4th lumbar vertebra to near the lumbo-sacral articulation, 

 where they each divide into the external 15 and internal iliac. 14 They are 

 about 2 inches in length, the right being a little longer than the left one, and 

 each is crossed by the ureter, just before its bifurcation. 



Describe the Internal Iliac. 14 It is about i^ inches long, and extends 

 from the lumbo-sacral articulation to the great sacro-sciatic notch, where it 

 divides into an anterior and a posterior trunk. From the anterior trunk are 

 given off from above downwards, the 



Superior Vesical, the remaining pervious part of the foetal hypogastric artery. 

 It sends branches to the vas deferens and the ureter ; and one, the Middle 

 Vesical, to the base of the bladder. 



Obturator, through the canal in the obturator foramen to the thigh, where V, 



divides into an internal and external branch. Within the pelvis it gives 



off an ili-ac, resical, and a pubic branch. In one out of 3^ cases this 



artery arises from the epigastric. 



Inferior Vesical, to the bladder, prostate gland, and vesiculae seminales. In 



the female this artery is called the Vaginal. 

 Middle Hemorrhoidal, to the rectum. 

 Uterine, in the female, anastomosing with the ovarian. 



