544 MESSRS. BEDDARD AND MITCHELL ON THE [June 19, 



patagialis fascia and the anterior tendon is inserted as is described 

 under the anconseus. 



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 the 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. 



Coracobrachial is 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 Irevis (subcoracoideus). — This arises entirely 

 from the coracoid, not at all from the ligament between the cora- 

 coid and the clavicle. A little before its insertion it is fused with 

 the ventral half of the subscapulars. 



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. 



Patagicdis. — 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 



