POSTERIOR BRACHIAL GROUP. 219 



POSTERIOR BRACHIAL GROUP. 



Scapuloulnaris. 

 Triceps extensor brachii. 

 Anconeus. 



SCAPULO-ULXARIS. 



(Scapulo-decranius Lonyus. ) 



(Fie. 79. rf.) 



Situated on the postero-intemal aspect of the region, adhering 

 to the caput magnum, this is a broad and flat muscle, aponeurotie 

 at its origin, with a fleshy belly, and divisible into an anterior 

 and posterior portion. 



Origin. Aponeurotie, from the dorsal angle and posterior 

 costa of the scapula. 



Insertion. To the inner part of the apex of the olecranon, 

 and to the antibrachial fascia. 



Relation. Externally with the caput magnum ; anteriorly 

 with the caput medium ; internally with the pectoralis magnus ; 

 superiorly with the latissimus dorsi. 



Action. To flex the shoulder joint, extend the elbow joint, 

 and tense the antibrachial fascia. 



TRICEPS EXTENSOR BRACHII. 

 (Triceps Brachii.) 

 (Fio. 78. d, e.) 



A very large and powerful muscle, occupying the space between 

 the posterior border of the scapula, the humerus, and the 

 olecranon. It consists of three parts, which have different origins, 

 but a common insertion to the olecranon process. We describe 

 them as if they were separate muscles, under their respective 

 names : 



Caput magnum. 



Caput medium. 



Caput parvum. 



