216 



MYOLOGY. 



Insertion. — By a flat tendon, which joins that of the latissi- 

 mus dorsi, to the internal tuberosity of 

 the humerus, between the tendons of in- 

 sertion of the coraco-humeralis. 



Relation. — Postero- externally with 

 the fascia of the latissimus dorsi and 

 scapulo-ulnaris ; anteriorly with the sub- 

 scapularis ; internally with the serratus 

 magnus; inferiorly with the coraco- 

 humeralis and humeralis obliquus. 



Action. — To ad duct, and rotate the 

 humerus inwards ; acting with the teres 

 externus the result is flexion. 



SCAPULO-HUMERALIS POSTICUS. 

 (Scapulo-humeralis Gracilis — Grele. ) 



Situated behind the shoulder joint, 

 between the caput magnum and the cap- 

 sular ligament, it is very small, slender, 

 and fusiform, with a pale, delicate, fleshy 

 belly, and tendinous extremities. 



Origin. — From the postero-inferior 

 part of the scapula, just above the 

 glenoid cavity, and the capsulaT ligament 

 of the shoulder joint. 



Insertion. — Between the fibres of the 

 humeralis obliquiis, to the posterior part 

 of the humerus, just below its head. 



Action. — To render tense the capsular 

 ligament of the joint, and thus prevent 

 its being crushed during flexion ; this 

 action was ascribed to it by Rigot, who 

 was the first to describe it. It is 

 believed to be peculiar to the solidun- 

 gula. 



Fig. 79. 

 Muscles of the anterior limb- 

 internal view, a, Subscapularis; 

 b. Teres intemus ; c, Coraco- 

 hnmeralis; d, Scapulo-ulnaris; 



e. Flexor metacarpi intemus; 



f. Flexor metacarpi medius; g, 

 .Caput parvum. 



Brachial Region. 



This region clothed by the brachial fascia, includes the muscles 

 which cover the humerus and its vicinity; they consist of an. 



