. The anatomy of the domestic animals . Veterinary anatomy. 672 BLOOD-VASCULAH SYSTEil OF THE HORSE ventral sacral foramina. They give off branches to the spinal cord and its mem- branes, which reinforce the ventral spinal artery, and others which emerge through the dorsal sacral foramina and supply the muscles and skin of the croup. (2) The middle coccygeal artery (A. coccygea) is an unpaired vessel which arises from the right or left lateral sacral or from a lateral coccygeal artery. It passes backward on the pelvic surface of the sacrum to the median line and con- tinues in that position al
. The anatomy of the domestic animals . Veterinary anatomy. 672 BLOOD-VASCULAH SYSTEil OF THE HORSE ventral sacral foramina. They give off branches to the spinal cord and its mem- branes, which reinforce the ventral spinal artery, and others which emerge through the dorsal sacral foramina and supply the muscles and skin of the croup. (2) The middle coccygeal artery (A. coccygea) is an unpaired vessel which arises from the right or left lateral sacral or from a lateral coccygeal artery. It passes backward on the pelvic surface of the sacrum to the median line and con- tinues in that position along the tail between the ventral muscles, supplying these and the skin. (3) The posterior gluteal artery (A. glutea caudalis)^ emerges through the upper part of the sacro-sciatic ligament and runs on the latter toward the tuber ischii, under cover of the biceps femoris (Fig. 580). It gives branches to that Common iliac veins Internal iliac artery External iliac artery Circumflex iliac artery Tubn eoiee Remnant of inguinal ligamint Sartot I n s Femoral ni ne Deep femoial visstU Trochanter tottii. Ohtunitoi I Diet ps /(/rtfi/d Setnitemhnosui Semimtnihranosus Fig. 581.—Deep Dissection of Ventral Wall of Pelvis of Horse (Male). 1, External pudic artery and small satellite vein; 2, anastomosis between external pudic and deep femoral veins; 3, accessory ligament: J^, round ligament; 5, transverse ligament; 6, head of femur; 7, obturator externus (stumps); 5, medial margin of obturator foramen; 5, origin of gracilis; iO, origin of adductor; ^i, bulbocavernosus; i;?, retractor penis; 13, suspensory ligament of penis. (After Schmaltz, Atlas d. Anat. d. Pferdes.) muscle, the semitendinosus, semimembranosus, superficial gluteus, and coccygeus, and anastomoses with the obturator, deep femoral, and posterior femoral arteries. (4) The lateral coccygeal artery (A. caudalis lateralis ventralis) continues the direction of the lateral sacral, but is much smaller than the preceding vessel. It p
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