CIRCULATORY APPARATUS. 95 



Cceliac axis. 



Below preceding, and divides after one-half of an inch, into 

 gastric, hepatic and splenic. 



Gastric, by two branches to stomach, gullet and lung. 



Splenic, passes to left to spleen, and gives off branches to spleen, 

 stomach and lejt gastro-omental. 



Hepatic, passes forward and to right to liver and gives off 



Pancreatic, pyloric and right gastro-omental branches. 



GREAT MESENTERIC. 



Arises near renal vessels two inches behind the preceding, 

 passes downward, and after a course of i^ inches divides into 

 branches to small intestine, ilio-cacal, superior and inferior cacal, 

 right colic, lejt colic, small colic and some twigs to supra-renal 

 capsules, mesentery, etc. 



SMALL MESENTERIC. 



Arises four to six inches behind preceding, and sends branches 

 to the small colon and rectum. 



Renal, two. 



Arise near great mesenteric, and supply the kidneys and supra- 

 renal glands. 



Spermatic, two in number. 



In the male are called great testicular, in female utero- ovarian. 

 Arise near small mesenteric and pass through inguinal canal 

 to testicle, in the female to the ovaries and cornua of the uterus. 



Small testicular, male; uterine, female. Two in number. 



Arise from bifurcation of aorta or from internal iliacs, to sper- 

 matic cord in male, and uterus and vagina in female. 



Lumbar, five or six. 



DISTRIBUTION OF THE EXTERNAL AND INTERNAL ILIAC ARTERIES IN THE MARE. 



i. Abdominal aorta; 2, Internal iliac artery; 3, Common origin of the internal pudic 

 and the umbilical arteries the latter is cut; 4, Internal pudic artery; 5, Vaginal 

 artery; 6, Lateral sacral artery; 7, Origin of the gluteal artery, which springs in 

 this instance from the lateral sacral, a circumstance most frequently observed in 

 the Ass; 8, Origin of the ilio-muscular artery; 9, Origin of the iliaco-femoral 

 artery; 10, Obturator artery; n, External iliac artery; 12, Circumflex iliac artery, 

 cut; 13, Femoral artery; 14, Common origin of the deep femoral and pre-pubic 

 arteries; 15, Origin of the anterior great muscular artery; 16, Origin of the 

 saphena artery, cut; 17, Innominate branch; 18, Popliteal artery; 19, Femoro- 

 popliteal; 20, Satellite artery of the great femoro-popliteal nerve; 21, Posterior 

 tibial artery; 22, Its communicating branch with the saphena; 23, External plan- 

 tar artery; 24, Satellite artery of the internal plantar nerve; 25. Digital artery. 



