16 TOPOGKAPHICAL ANATOMY OF 



The insertion of the biceps, partly concealed by the medial 

 collateral ligament of the elbow joint, with which some of its fibres 

 are blended, is into the tuberosity of the radius. It will be observed 

 that a stout, flattened tendinous band passes from the biceps to the 

 surface of the radial extensor of the carpus and the fascia of the 

 forearm. 



M. coracobrachialis. — The coracobrachial l muscle is comparatively 

 small. Its long narrow tendon of origin begins on the projection on 

 the medial surface of the coracoid process of the scapula, and appearing 

 between the supraspinous and subscapular muscles crosses the insertion 

 of the latter and gives place to a fusiform fleshy belly. A small 

 synovial bursa is interposed between the tendon of origin of the 

 coracobrachialis and the tendon of insertion of the subscapular 

 muscle. 



The insertion of the coracobrachialis is into the medial surface of 

 the humerus both proximal and distal to the common insertion of the 

 latissimus dorsi and teres major. 



M. tensor FASCIAE ANTiBRACHii. — The flattened tensor of the anti- 

 brachial 2 fascia has an extensive and very thin membranous tendon of 

 origin attached to the axillary border of the scapula and intimately 

 connected with the origin of the long head of the triceps and the 

 tendon of insertion of the latissimus dorsi. The fleshy portion of the 

 tensor, placed medial to the triceps mass, is inserted into the posterior 

 border of the olecranon and the fascia of the forearm. In raising the 

 tensor from the triceps upon which it rests, the dissector should begin 

 at the posterior border of the muscle where it is thickest. This will 

 prevent accidental destruction of the thin tendon of origin. 



Dissection. — Cut across the tensor of the antibrachial fascia about 

 the middle of its length and turn the cut ends aside in order to 

 expose the triceps muscles. 



M. triceps brachii. — The triangular gap between the scapula and 

 the humerus is occupied by the powerful triceps 3 muscle. As its name 

 indicates, three parts of the muscle are to be distinguished ; but only 

 two of them — caput longum and caput mediale — can be dissected at 

 this stage. The third head must be left until the lateral aspect of the 

 arm is examined. 



Caput longum. — The long head of the triceps is a thick, triangular 



1 Kopa£ (corax) [Gr.], raven. The coracoid process is so called from its resem- 

 blance, in man, to the beak of a raven. Brachium [L.], fipayjiwv [Gr.], the arm. 



2 Objections have been raised to the use of the term cmh'-brachium. It is con- 

 tended, with reason, that the prefix should be ante. 



3 Tres [L.], three. Caput [L.], head. 



