. The comparative anatomy of the domesticated animals. Veterinary anatomy. MUSCLES OF THE TRUNK. 273 inserted into each of the coccygeal bones. With regard to their situation, these muscles are distinguished as sacro-coccygeus superior, sacro-coccygeus 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 the supra-sacral spine, or from the coccygeal vertebrse themselves. The tendons for their movable insertion into these vert
. The comparative anatomy of the domesticated animals. Veterinary anatomy. MUSCLES OF THE TRUNK. 273 inserted into each of the coccygeal bones. With regard to their situation, these muscles are distinguished as sacro-coccygeus superior, sacro-coccygeus 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 the supra-sacral spine, or from the coccygeal vertebrse themselves. The tendons for their movable insertion into these vertebrae are always very short. This muscle, covered by the coccygeal aponeurosis, in turn covers the vertebrae 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 semispinahs 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 precedmg; its constituent fasciculi take their origin from the Fi?. 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, crureus. 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 vertebrae. 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 : outwardly, to the scia
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