OCR Text |
Show 544 MESSRS. BEDDARD AND MITCHELL ON THE [June 19, patagialis fascia and the anterior tendon is inserted as is described under the anconaeus. Pectoralis major.-This muscle arises from the entire length of the carina sterni, from the lateral and posterior regions of the sternum, and from the clavicle. There is no origin from the ribs. The posterior margin of the muscle is entirely tendinous. It is inserted on to the fasciae covering the biceps and on to the deltoid ridge of tbe humerus. Pectoralis minor.-As usual a markedly bipinnate muscle. It arises from the entire keel of the sternum, except the extreme anterior end, from the adjacent part of the sternum to a distance of about half an inch of the keel, from the lower half of the coracoid, and from the anterior part of the ligament between coracoid and clavicle. It is inserted on to the beginning of the deltoid crest by an apparently unusually short though strong tendon. Sterno-coracoid.-This muscle is entirely fleshy. It passes from the anterior lateral border of the sternum to the adjoining part of the coracoid. Coracobrachialis longus.-This arises from the distal half of the coracoid, with a slight overlap on to the sternum. It is inserted on to the great tuberosity of the humerus, on the side of the insertion of the biceps remote from that of the teres major. Coracobrachialis brevis (subcoracoideus).-This arises entirely from the coracoid, not at all from the ligament between the coracoid and the clavicle. A little before its insertion it is fused with the ventral half of the subscapularis. Coracobrachialis anterior.-This muscle is large and springs from the anterior process of the coracoid dorsal to the biceps head. It is inserted fleshy over a very broad area of the anterior face of the humerus under the deltoid crest, where it is covered by the pectoralis major. Coracobrachialis internus.-This small muscle lies immediately under the deltoid minor. It is inserted by a very short flat tendon on to the end of deltoid ridge, just above but internal to insertion of deltoides major. Deltoides major.-This arises from the junction of the scapula and clavicle. There is a trace of division into two parts, of which the more dorsal is inserted further down on to the humerus, with a strongly tendinous insertion ; the other part is inserted fleshy, but this is quite continuous with that of the last. The entire insertion of the muscle extends for three inches down the humerus. Deltoides minor.-This springs entirely fleshy from the scapula and clavicle at their junction. It lies under the patagial muscle, but is narrower than that. It is inserted on to the anterior edge of deltoid crest. Patagialis.-This arises as a broad band covering the junction of the scapula and clavicle, external to but broader than the deltoides minor. It gives rise chiefly to the brevis tendon, but gives off a narrow slip to the longus tendon ; the pectoral part is |