202 



MUSCLES OF THE UPrER LIMB. 



The dorsal scapular arteiy 

 passes between it and the bone. 

 At its lower border is the teres 

 major separated in part by the 

 long head of the triceps. A 

 bui-sa is sometimes found be- 

 tween the tendon and the 

 bone. 



Fig. 171. — SuPEKFiciAL Muscles 

 OF THE Shoulder and Upper 

 Limb, seen from behind. 

 (A. T.) 1 



a, acromion ; h, base of the sca- 

 pida ; c, tendon of the trapezixis 

 muscle over the triangular surface 

 of the spine of the scapula ; d, 

 olecranon of the ulna ; c, external 

 condylar eminence ; /, lower end 

 of the ulna ; 1, trapezius ; '^, acro- 

 mial part of deltoid ; 2', the part 

 of the same muscle rising from 

 the spine of the scapula ; 3, rhom- 

 boideus major ; 4, infras^iinatus ; 

 5, teres minor ; 6, teres major ; 

 7, latissimus dorsi ; + , space be- 

 tween tlie trapezius, rliomboid and 

 latissimus muscles ; 8, triceps ex- 

 tensor cubiti ; 8', its outer head ; 

 8", part of its inner head ; 9, an- 

 coneus ; 10, part of the brachialis 

 anticus ; 11, supinator longus ; 

 \'l, extensor carpi radialis longior. 

 The explanation of the remaining 

 references will be foimd in the 

 description of fig. 182. 



The teres major muscle 

 arises from the flat oval 

 surface on the dorsum of 

 the scapula near its inferior 

 angle, slightly from the 

 axillary border of the bone, 

 and from the septa inter- 

 posed between it and the 

 teres minor and infraspi- 

 natus. It is inserted by a 

 flat tendon about two 

 inches wide, into the inner 

 border of the bicipital 

 groove of the humerus, 

 behind and in contact with 

 the tendon of the latissimus 

 dorsi, to which it is ad- 

 herent for a short space. 

 Close to the insertion, how- 

 ever, the tendons of these 

 muscles are separated by a 

 small bursa. The fibres 

 of the muscle are longitu- 

 dinal. 



