. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. MUSCLES OF THE TRUNK. 273 inserted into each of the coccygeal bones. With regard to their situation, these miLScles are distinguished as sacro-coccygeus superior, sacro-coccijgeus inferior, and sacro-coccygeus lateralis. A. Sacro-coccygeus Superior (Erector Coccygis).—The fasciculi which form this muscle have their fixed insertion either in the summits and sides of the three or four last processes of tlie supra-sacral spine, or from the coccygeal vertebrae tliemselves. The tendons for their movable insertion int
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. MUSCLES OF THE TRUNK. 273 inserted into each of the coccygeal bones. With regard to their situation, these miLScles are distinguished as sacro-coccygeus superior, sacro-coccijgeus inferior, and sacro-coccygeus lateralis. A. Sacro-coccygeus Superior (Erector Coccygis).—The fasciculi which form this muscle have their fixed insertion either in the summits and sides of the three or four last processes of tlie supra-sacral spine, or from the coccygeal vertebrae tliemselves. The tendons for their movable insertion into these vertebraB are always very short. This muscle, co\ered by the coccygeal aponeurosis, in turn covera the vertebras it moves. It responds : inwardly, to the analogous muscle of the opposite side ; outwardly, to the lateral sacro-coccygeus, and, near its anterior extremity, to a very strong aponeurotic expansion which separates it from the semispinalis muscle. It directly elevates the tail, or pulls it to one side, according as it acts in concert with its fellow or singly. B. Sacro-coccygeus Inferior (Depressor Coccygis).—This muscle is thicker than the preceding ; its constituent fasciculi take theii- origin from the Ficr. SACRO-ILIAC AND COXO-FEMORAL ARTICULATIONS, WITH THEIR SURROUNDING MUSCLES. 1, Sacro-coccygeus superior; 2, sacro-coccygeus lateralis; 3, sacro-coccygeus inferior,* 4, ischio« coccygeus ; 5, deep gluteus; 6, criireus. inferior surface of the sacrum, towards the third vertebra, and from the internal face of the sacro-sciatic ligament and the coccygeal bones. It readily divides into two parallel portions, which Bourgelat has described as two separate muscles. The fasciculi of the internal portion are inserted, by their posterior extremity, into the inferior face of the first coccygeal vertebras. Those of the external portion are furnished with strong superficial tendons, nearly all of which are for the bones of the tail. This muscle responds : o
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