. The comparative anatomy of the domesticated animals. Veterinary anatomy. MUSCLES OF THE ANTERIOR LIMBS. 311 spinatus across, and to throw back the sections: an operation requiring some care, because of the intimate adherence of the short abductor to the infra-spinatus. 1. External Scapular Aponeurosis. This aponeurosis, to which the pectoralis parvus and long adductor of the arm act as tensors, gives origin, by its internal face, to several septa which penetrate between the scapular muscles, and form around them more or less complete contentive sheaths. Its external face is separated from th
. The comparative anatomy of the domesticated animals. Veterinary anatomy. MUSCLES OF THE ANTERIOR LIMBS. 311 spinatus across, and to throw back the sections: an operation requiring some care, because of the intimate adherence of the short abductor to the infra-spinatus. 1. External Scapular Aponeurosis. This aponeurosis, to which the pectoralis parvus and long adductor of the arm act as tensors, gives origin, by its internal face, to several septa which penetrate between the scapular muscles, and form around them more or less complete contentive sheaths. Its external face is separated from the skin by the panniculus carnosus, trape- zius, mastoido-humeralis, and the aponeurotic fascia which unites the last two muscles. It is continuous, in front, with the thin fibrous ex- pansion extended over the internal scapular muscles ; behind and downwards, it is prolonged over the muscles of the arm and insensibly de- generates into connective tissues ; above, it is attached to the fibro-cartilaginous prolongation of the scapula. 2. Long Abductor of the Arm (Teres Ex- TERNus), OR Scapular Portion of the Deltoid (Fig. 179, 1, 1). Synonyms. — Scapiilo-humeralis magnus — Girard. (Teres major—Percivall. Great scapulotrochiterius—Leyh.) Situation—Composition—Form —Direction.— This muscle is situated beneath the scapular aponeurosis, behind the infra-spinatus, and is composed of two portions placed one above the other, separated by a superficial interspace. The posterior portion, the most considerable, is elon- gated from above to below, bulging in its middle, narrow at its extremities, plane on its external and convex on its internal surface. It accompanies the posterior border of the infra-spinatus, and is lodged in a depression in the large extensor muscle of the forearm. The anterior portion, much shorter than the preceding, extends over the infra-spinatus and short abductor, by sUghtly crossing the direction Fig. EXTERNAL MUSCLES OF THE RIGHT ANTERIOR LI
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