INNER ASPECT OF LIMB 19 



'The Teres Major (4). — The origin ot this muscle is from the dorsal 

 angle ot the scapula. It is also united to the subscapularis by a fibrous 

 aponeurosis. It is a well-defined muscle, and its anterior border follows 

 closely the glenoid edge of the scapula. 



It is inserted with the tendon of the latissimus dorsi muscle into the 

 internal tubercle of the humerus, the tendon of the latissimus dorsi 

 forming a twist round that of the teres major. This muscle is a flexor 

 and an inward rotator of the shoulder, and its nerve-supply, as is seen in 

 the plate, comes direct from the brachial plexus. 



The ScapLilo-ulnaris (22). — Only part of this muscle is represented. 

 The upper and anterior portions have been cut away to expose the 

 vessels, muscles, and nerves which lie beneath it. 



It is a thin, flat muscle, arising from the glenoid border of the 

 scapula. 



It rests on the teres major and triceps muscles, and is inserted by a 

 thin aponeurotic tendon into the olecranon process and into the fascia 

 of the forearm. It extends the elbow joint, is a slight flexor of the 

 shoulder, and makes tense the fascia of the forearm. 



The scapulo-ulnaris is supplied by the musculo-spiral nerve. 



The Triceps Extensor Cubiti. — The caput magnum is visible on this 

 aspect of the fore limb also. It has already been described. 



The Caput Parvum. — A small portion of this muscle is represented. 

 The remainder is covered by the scapulo-ulnaris. It arises from the 

 shaft of the humerus below the insertion of the teres major and latissimus 

 dorsi, and it is inserted into the olecranon process. 



The Coraco-humeralis (27). — The whole of this muscle is seen. It 

 arises from the small tubercle which is placed on the inner aspect of the 

 coracoid process. It has two insertions into the front of the humerus, 

 one above the internal tubercle and the other into a roughened Hne 

 which extends vertically downwards from the tubercle. Between these 

 two insertions the prehumeral vessels with their accompanying 

 nerve, pass. 



