38 DISSECTION OF THE CAT 



b. The second and most external part arises 

 from the head of the humerus, beneath the inser- 

 tion of the teres minor. Its fibres pass downward, 

 and are inserted by a tendon on the olecranon 

 process. (Plates II. and III.) 



c. The third division arises from the upper part 

 of the shaft of the humerus, below the insertion 

 of the teres major. Its fibres unite with those of 

 the fourth division (d), and are inserted on the 

 olecranon process. (Plates III. and IV.) 



d. This division is the most internal, and arises 

 just below the head of the humerus, between the 

 origin of the second division (b) and the insertion 

 of the coraco-brachialis. It passes downward and 

 unites with the third part (r), and both are in- 

 serted on the olecranon process. (Plate IV.) 



e. The smallest part of the triceps arises from 

 the bridge of bone bounding the supracondyloid 

 foramen of the humerus, as far down as the inter- 

 nal condyle. , Its fibres pass back to their insertion 

 on the inner side of the olecranon process. 



23. The Anconeus Muscle arises from the lower 

 half of the shaft of the humerus, the margins of 

 the olecranon fossa, and the external condyle. 

 Its fibres pass between the second (U) and third 

 (c] parts of the triceps, to their insertion in the 

 fossa just outside the olecranon process. (Plates 

 II. and III.) 



