EXTERNAL SCAPULAR GROUP. 



213 



Jielat ion. — Anteriorly 

 Avtth the ca^put magnum, 

 caput medium.and postea- 

 spinatus; externally with 

 the scapular fascia, 



A dion . — To abduct 

 the humerus, and rotate 

 it outwards; when acting 

 with the teres internus 

 to flex the shoulder joint. 



with the postea-spinatus ; internally 



ANTEA-SPINATUS. 



XSaperacromio-trochiterius.) 



(Fig. 78, a.) 



Occupying the antea- 

 ?pinatus fossa of the 

 scapula, this muscle is 

 pjTamidal in shape, with 

 the base downwards. Its 

 fleshy fibres extend ob- 

 liquely forwards; then be- 

 coming tendinous infer- 

 iorly, it is bifurcated for 

 the passage of the flexor 

 brachii tendon, the divi- 

 sions being connected by 

 aponeurosis. 



Origin. — From the 

 anterior fossa, anterior 

 costa, and cervical angle 

 of the scapula, and the 

 anterior surface of its 

 spine. 



Insertion. — By two 

 parts, one external, to 

 the summit of the exter- „ , , .^ . • ,. ^ . , . 



Muscles of the anterior limb— external view, a, Antea- 



nal trochanter, and one splnatos ; 6, Postea-spInatus ; c, Teres extemus ; d. Caput 



intprnal +n tliP «iiTYimit «>agnum ; e. Caput medium ;/, Flexor brachii ; jr, Extensor 



luueiudl, to xne summit metacarpimagnus; ft, Extensor metacarpiobUquus:i,Flexor 



of the internal trochanter, metacarpi extemus ; fc. Extensor pedis ; fc', Its tendon ; fc" 



n ,1 1 Fibrous band from the suspensory ligament ; I, Extensor 



Ot the humerus. suffraginis = V, its tendon. 



Fig. 78. 



