THE ARTERIES. 29 
_b. Branches given off after the union of the two arches to 
form the dorsal aorta :— 
1. The ceeliaco-mesenteric artery: a large median artery 
Le) 
arising immediately beyond the point of union of the 
two arches (or sometimes from the left arch, just 
before the union), and supplying the stomach and 
intestines. Its branches are : 
i. The celiac artery: which divides into 
a. The gastric artery: supplying the stomach. 
(@. The hepatic artery: supplying the liver and 
gall-bladder. 
ii, The mesenteric artery: which divides into 
a. The superior mesenteric artery: supplying 
the upper part of the intestine. 
(3. The inferior mesenteric artery: supplying 
the lower part of the intestine. 
y. The splenic artery: supplying the spleen. 
. The urinogenital arteries: from four to six small 
arteries which arise from the ventral surface of the 
aorta between the kidneys, and immediately divide 
into right and left branches, supplying the kidneys, 
the reproductive organs and ducts, and the fat 
bodies. 
. The lumbar arteries: small paired lateral branches 
supplying the body-walls. 
. The hemorrhoidal artery: a small median artery 
arising from the lower end of the aorta, and supplying 
the large intestine. 
¢, Branches formed by the division of the aorta :— 
i 
The iliac arteries: two large arteries formed by the 
division of the aorta, and supplying the hind-limbs. 
Each gives off a hypogastric artery, which supplies 
the bladder, giving epigastric branches to the ventral 
body-wall, and then continues as the sciatic artery 
down the leg, giving off branches to the muscles and 
skin of the thigh, and dividing at the knee into 
peroneal and tibial arteries supplying the leg and foot. 
