716 THE BLOOD-VASCULAR SYSTEM OF THE OX 
2. The ileo-caco-colic artery ramifies on the right face of the spiral part of the 
colon. It gives off the ileo-cxecal artery, which divides into ileal and cecal arteries. 
3. The ramus collateralis runs in the mesentery in a curve along the ventral 
border of the coils of the colon. (This vessel is absent in the sheep.) 
4. The continuing trunk (Truncus intestinalis) of the anterior mesenteric 
pursues a course in the mesentery corresponding to the series of mesenteric lymph 
glands and is connected with the ramus collateralis. 
The two preceding vessels are essentially the arteries of the small intestine, 
which they supply with the exception of its initial and terminal parts. The ramus 
collateralis gives off no considerable branches in its course along the ventral border 
of the coils of the colon, but on curving upward along the latter it anastomoses with 
Fic, 600.—PEtvic ARTERIES OF Cow. 
Part of the right wall of the uterus and vagina is removed and the cervix uteri is shown in sagittal section. a, 
ovarian, and b’’, uterine branch of b; c, external iliac artery; d, right internal iliac 
Aorta; b, utero-ovarian artery; b’, 
.; h, anterior gluteal 
artery; e, common trunk of umbilical artery (e’) and middle uterine artery (Jf); g, ilio-lumbar arte: 
arteries; 7, middle hemorrhoidal artery; &, posterior uterine artery; J, perineal artery; m, posterior gluteal artery; n, 
obturator arteries; 0, artery of clitoris; p, posterior mesenteric artery; r, anterior hemorrhoidal artery; s, middle 
sacral artery; 1, ovary; 2, apparent body of uterus, really apposed horns; 2’, horn of uterus; 3, vagina; 4, neck of uterus; 
,’, external orifice of uterus (os uteri); 5, 5’, broad ligaments, large part of right one removed; 6, urinary bladder; 7 
44 
rectum; 8, sacrum; 9, symphysis pelvis. (After Zieger.) 
the continuing trunk of the anterior mesenteric artery and detaches numerous 
branches to the small intestine which form series of superposed anastomotic arches. 
It supplies, roughly speaking, about one-third of the small intestine and terminates 
by joining the ileal artery. The continuing trunk gives off numerous branches 
which also form arches and supply about the first two-thirds of the small intestine, 
exclusive of the small part supplied by branches of the cceliac artery. Both arteries 
give branches to the lymph glands.! 
The posterior mesenteric artery arises from the aorta near its termination. It 
is small and supplies branches to the terminal part of the colon and to the rectum 
(A. colica sinistra; A. hemorrhoidalis cranialis). 
Tt is difficult to make the arrangement of these vessels clear in a brief textual description, 
but a reference to the schematic figure will explain the main facts. 
