216 



MYOLOGY. 



Insertion. By a Hat 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 adduct, 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 capsular ligament 

 of the shoulder joint. 



Insertion.- Between the fibres of the 

 humeralis obilquus, to the posterior part 

 of the humerus, just below its head. 



Action. To render tense the capsular 

 ligament of the 1 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 interims ; c, Coraco- 

 humeralis ; d, Scapulo-ulnaris ; 

 e, Flexor inetacarpi internus ; 

 /, 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 



