. The anatomy of the domestic animals. Veterinary anatomy. 280 AND MUSCLES OF THE HORSE. Fig. Horse. 71.—CR08S-SECTION OF Tai 1. 2, Branches of lateral coccygeal vessels and nerve; 3. mid- dle coccygeal artery; 4, sacro-coccygeus doraalis; 4', sacro-coccy- geus lateralis; 5, 5', interlransversalea; 6, sacro-coccygeus ven- tralis; 7, recto-coccygeus; 8, coccygeal fascia; 9, fibro-cartilage between fourth and fifth coccygeal vertebrie. The veins arc black. Origin.—The pelvic surface of the sacro-sciatic hgament near the ischiatic spine. Insertion.—The first four coccj'geal vertebrae and
. The anatomy of the domestic animals. Veterinary anatomy. 280 AND MUSCLES OF THE HORSE. Fig. Horse. 71.—CR08S-SECTION OF Tai 1. 2, Branches of lateral coccygeal vessels and nerve; 3. mid- dle coccygeal artery; 4, sacro-coccygeus doraalis; 4', sacro-coccy- geus lateralis; 5, 5', interlransversalea; 6, sacro-coccygeus ven- tralis; 7, recto-coccygeus; 8, coccygeal fascia; 9, fibro-cartilage between fourth and fifth coccygeal vertebrie. The veins arc black. Origin.—The pelvic surface of the sacro-sciatic hgament near the ischiatic spine. Insertion.—The first four coccj'geal vertebrae and the coccygeal fascia. Action.—Acting together, to de- press (flex) the tail, compressing it over the perineum; acting singly, to depress and incline it to the same side. Structure.—The origin of the muscle is aponeurotic. Becoming fleshy, its fibers pass upward and backward and divide into two layers. The lateral layer is at- tached to the vertebrae, the medial to the fascia; included between the two lie the intertransversales. When the tail is raised, the ventral edges of the muscles produce a dis- tinct ridge at cither sideof the anus. Relations. — Laterally, the sacro-sciatic ligament and the semi- membranosus ; medially, the rectum and the sacro-coccygeus ventralis muscle. The internal pudic artery crosses the origin of the muscle. 2. Sacro-coccygeus dorsalis (M. sacrococcygeus dorsalis medialis).'—This muscle lies alonji tiic tl(irso-median aspect of the tail, in contact with its fellow. Origin.—The last three sac- ral spines and some of the coccy- geal spines. Insertion.—The dorsal sur- face of the coccygeal vertebrae. Action.—Acting together, to elevate (extend) the tail; acting singly, to elevate and incline it laterally. Structwr.—The muscle has a strong rounded belly. It is in- serted by means of short tendons which fuse with those of the next muscle. Relations.—Superficially, the coccygeal fascia; medially, its fellow; laterally, the sacro-coc
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
