OF THE MUSCLES. 



99 



coid process of the scapula. Insertion. Into the capsular 

 ligament ; and into the inner tubercle of the humerus. 

 Action. To prevent the abducting power of the antea mus- 

 cles. Acting' singly it would slightly adduct the humerus. 



These last three muscles are copiously intersected by fascia, 

 which endows them wdth endurance ; as well as enables them 

 to act in the place of ligaments to the shoulder-joint. 



Triceps extensor brachii (has three heads) : — Caput 

 MAGNUM {Plate II. g. Plate III. 2. Fig 1.4). Arises: from 

 the posterior margin of the scapula ; from a ridge extending 

 along the neck of the bone, upon the outer side ; and from 

 the capsular ligament of the shoulder-joint. Insertion. 

 Into the posterior of the olecranon. 



Caput medium {Plate II. k. Plate III. 3. Fig 1.7). 



FIG 2. 



deep-seated muscles in- 

 side OF the HUMERUS. 



1, The coraco humeralis. 



2, Humeralis. 



3, Flexor brachii. 



4, Caput parvum of the triceps ex- 



tensor brachii. 



5, Minimus. 



Origin. From a ridge upon the outer side of the humerus. 

 Insertion. Into the outer part of the olecranon. 



Caput parvum {Fig 2.4). Arises : from the body of 

 the humerus. Inserted : into the inner side of the olecranon 



H 2 



