120 THE MYOLOGY OF THE RAVEN. 



from the superior aspect of the scapula, upon a circum- 

 scribed area just posterior to the glenoid cavity (Fig. 24) ; 

 the fibres form a rather thick, flattened muscle, which, 

 winding round the shoulder-joint, beneath the deltoid, 

 and parallel to the fibres of the scapular head of that 

 muscle, becomes feebly blended with those of the external 

 head of the triceps, as they together pass down on the 

 postero-lateral aspect of the humeral shaft. The con- 

 nection of this part of the muscle along its course, in 

 this locality, with the other heads of the triceps, is 

 most intimate through the closely binding fascia, rather 

 than through any blending that takes place among the 

 fibres of the several portions. 



Just above the elbow, the fibres of the scapular head 

 of the triceps converge and merge into a strong cord- 

 like though flattened tendon, which passes to the radial 

 side of the olecranon process of the ulna to become 

 inserted there, near its base. 



The internal and external heads of the triceps are 

 intimately blended except at their proximal extremities. 

 In this last situation they form a well-marked bifurca- 

 tion, where each arises from the anconal surface of the 

 shaft of the humerus ; the internal head towards the 

 deltoid attachment, and the external head running into 

 the pneumatic fossa. Between the limbs of the mus- 

 cular bifurcation thus formed arises the supraspinatus 

 muscle. The external head of the triceps in this locality 

 also of itself bifurcates in order to allow the teres et 

 ii/fraspinatus muscle to attach itself to the humeral 

 shaft (Fig. 27). 



The internal and external heads of the triceps become 

 blended in their attachment down the anconal aspect of 

 the bone to a point below the insertion of the deltoid. 

 Here they form a flat tendon, partly muscular, which is 

 quite broad, and that passes over the elbow-joint to 



