EXTEKNAL SCAPULAR GROUP. 



213 



Relation. — Anteriorly 

 with the caput magnum, 

 caputmedium^andpostea- 

 spinatus ; externally with 

 the scapular fascia. 



Action. — To abduct 

 the humerus, and rotate 

 it outwards; when acting 

 with the teres internus 

 to flex the shoulder joint. 



ith the postea-spinatus ; internally 



ANTEA-SPIXATUS. 



{Superacromio-trochiterius.^ 



(Fig. 78. a.) 



Occupying the antea- 

 spinatus fossa of the 

 scapula, this muscle is 

 jiyramidal in shape, with ||' \\ ji f 



the base downwards. Its 

 fleshy fibres extend ob- 

 liquely forwards ; then 

 becoming tendinous in- 

 feriorly, it is bifurcated 

 for the passage of the 

 flexor brachii tendon, the 

 divisions 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 splnatus -, 6, Postea-spinatus ; c. Teres externus ; d, caput 



intprnnl to thp tJlimiTlit magnum; e, Caput medium;/. Flexor brachii; g, Ex- 



mieiuai, W LUe bumunu tensor metacarpi magnus ; 7t, Extensor metacarpi obliquus; 



of the internal trochanter, i, Flexor metacarpl externus ; k, Extensor pedis; k', Its 



f, , , tendon ; k", Fibrous baud from the suspensory ligament; 



01 the humerus. i^ Extensor suffraginis ; I', Its tendon. 



