668 



BLOOD-VASCULAE SYSTEM OF THE HORSE 



collateral branches are detached to the ureter, the epididj'mis, and the spermatic 

 cord. 



\' a. The utero-ovarian arteries in the female correspond to the preceding ves- 

 sels, but are much larger and shorter. Each is placed in the anterior part of the 

 broad ligament of the uterus and divides into ovarian and uterine branches. The 

 ovarian artery (A. ovarica) pursues a flexuous course to the ovary, which it supplies. 

 The anterior uterine artery (A. uterina cranialis) passes to the concave border of the 

 cornu of the uterus, which it supplies, anastomosing with the middle uterine artery. 



VI. The lumbar arteries (Aa. lumbales) are in series with the intercostal 



Sncra-curcygeus venlralis 

 Rt cto-coccygeus 



SpJi meter ani externus 



Ri I) actor ani 



Perineal artery 



Perineal nerves 



Internal pudic 



artery 



Dorsal neree of 



penis I 



Fig. 577. — Dissection of Perineum of Horse (AIale). 



7, Bulbo-urethral gland; 2, transversus perinei muscle (?); 3, ischio-urethral muscle; 4, retractor penis muscle; 5 



bulbo-cavernosus muscle. (After Schmaltz, Atlas d. Anat. d. Pferdes.) 



arteries and have a similar origin and distribution. There are usually six pairs of 

 lumbar arteries, of which five arise from the aorta and the sixth from the internal 

 iliac or the lateral sacral at the junction of the last lumbar vertebra and the sacrum. 

 Each passes across the body of a lumbar vertebra to the intertransverse space, 

 gives branches to the sublumbar muscles, and divides into dorsal and ventral 

 branches. The dorsal branch (Ramus dorsalis), the larger of the two, passes 

 upward to ramify in the extensor muscles of the spine and the skin of the loins; 

 it gives off a spinal branch (Ramus spinalis) which comports itself like the corre- 

 sponding branch of an aortic intercostal artery. The ventral branch (Ramus 

 ventralis) runs outward in the intertransverse space, passes between the transversus 



