. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 294 THE MUSCLES. Fig. 174. volume. Extending from the ninth or tenth rib to the upper extremity of the arm, it at first Ues beneath and against the abdomen, then beneath the chest, and at last is comprised between the walls of the latter cavity and the internal face of the anterior limb. Form.—It is thin and flat above and below in its posterior third, thicker and depre sed from side to side in its middle third, and narrow and prismatic in its anterior third. Its general form may be compared to that of a somewha
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 294 THE MUSCLES. Fig. 174. volume. Extending from the ninth or tenth rib to the upper extremity of the arm, it at first Ues beneath and against the abdomen, then beneath the chest, and at last is comprised between the walls of the latter cavity and the internal face of the anterior limb. Form.—It is thin and flat above and below in its posterior third, thicker and depre sed from side to side in its middle third, and narrow and prismatic in its anterior third. Its general form may be compared to that of a somewhat irregular triangle, elongated from before to behind, which would have a very short posterior border, a longer internal or inferior border, and an external or superior, still more extensive. Strudure.—It is entirely composed of thick, parallel, fleshy fasciculi, all of which leave the posterior or internal border of the muscle to gain its narrow or anterior extremity. These fasciculi, as they approach the superior border, become longer, and those which proceed from the posterior border commence by aponeurotic fibres. Unfrequent intersections of fibrous tissue exist towards the anterior extremity of the muscle. Attachments.—It originates: 1. From the tunica abdominalis by the aponeurotic fasciculi of its posterior border. 2. By its internal border, from the posterior two-thirds of the inferior border of the sternum. It terminates, by its anterior extremity, on the internal tubercle at the head of the humerus, the tendon of origin of the coraco-humeralis, and the fascia enveloping the coraco-radialis. Through the medium of this fascia, it is inserted into the external lip of the bicipital groove formed by the external trochanter, and is united to the two terminal branches of the supra-spinatus muscles (see Figs. 174, 12 ; 181, 5). Relations.—Its deep face, which is suc- cessively superior and internal, covers the ex- ternal oblique and the straight muscle of the abdomen,
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