86 



ANATOMY. 



FIG. 44. 



Infra-spinatus, from the inner two-thirds of the infra-spinous fossa, into 

 the middle facet on thegreater tuberosity of the humerus. Action, to rotate 

 the humerus outwards. Nerve, supra-scapular. 



Teres Minor, from the upper two-thirds of the dorsal surface of the axillary 

 border of the scapula, into the lowest facet on the greater tuberosity of 

 the humerus, and the bone below. Action, to rotate the humerus outwards, 

 Nerve, circumflex. 



Teres Major, from the dorsal aspect of the inferior angle of the scapula, 

 into the internal bicipital ridge of the humerus. Action, to assist the latis- 

 simus dorsi. Nerve, subscapular. 



Coraco-brachialis, n /rc>w the apex of the coracoid process 2 of the scapula, 

 into a ridge on the inner side of the shaft of 

 the humerus, about its middle. Action, elevates 

 the humerus forwards and inwards. Nerve, mus- 

 culo-cutaneous, which perforates this muscle. 



Biceps 15 (Biceps Flexor Cubiti). Long head 9 - 

 from the upper margin of the glenoid cavity, 

 short head from the apex of the coracoid 

 process, 2 in common with the coraco-brachi- 

 alis, into the back of the tuberosity of the 

 radius, and the fascia of the forearm. 20 

 Action, to flex and supinate the forearm, and 

 to make tense its fascia. Nerve, the musculo- 

 cutaneous. 



Brachialis Anti / cus, 17 from the lower half of 

 the shaft of the humerus anteriorly and later- 

 ally, embracing the insertion of the deltoid, 9 

 into the base of the coronoid process of the 

 ulna. 19 Action, a flexor of the forearm. 

 Nerves, musculo-cutaneous and musculo-spiral. 



Triceps 16 (Triceps Extensor Cubiti), by three 

 heads, the outer and inner from the posterior 

 surface of the shaft of the humerus, the outer 

 above, the inner below the musculo-spiral 

 groove; the middle or long head from a de- 

 pression below the glenoid cavity of the scapula, 

 into the upper end of the olecranon process 

 of the ulna. Action, to extend the forearm 

 Nerve, musculo-spiral. 



