. The anatomy of the domestic animals . Veterinary anatomy. Fig. 271.—Cross-section of Tail of Horse. 1, 2, Branches of lateral coccygeal reaaels and nerve; 3, mid- dle coccygeal artery; 4, sacro-coccygeus dorsalis; 4', sacro-coccy- geus lateralis; 5, 5', iatertransveraales; 6, sacro-coccygeus ven- tralis; 7, recto-coccygeus; 8, coccygeal fascia; 9, fibro-cartilage between fourth and fifth coccygeal vertebrse. The veins are blaclt. Origin.—The pelvic surface of the sacro-sciatic hgament near the ischiatic spine. Insertion.—The first four coccygeal vertebrae and the coccygeal fascia. Action.—Ac
. The anatomy of the domestic animals . Veterinary anatomy. Fig. 271.—Cross-section of Tail of Horse. 1, 2, Branches of lateral coccygeal reaaels and nerve; 3, mid- dle coccygeal artery; 4, sacro-coccygeus dorsalis; 4', sacro-coccy- geus lateralis; 5, 5', iatertransveraales; 6, sacro-coccygeus ven- tralis; 7, recto-coccygeus; 8, coccygeal fascia; 9, fibro-cartilage between fourth and fifth coccygeal vertebrse. The veins are blaclt. Origin.—The pelvic surface of the sacro-sciatic hgament near the ischiatic spine. Insertion.—The first four coccygeal 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 vertebrse, 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 either side of 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).i—This muscle lies along the dorso-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 vertebrse. Action.—Acting together, to elevate (extend) the tail; acting singly, to elevate and incline it laterally. Structure.—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-coccy- geus lateralis; deeplj^, the v
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