EXTERNAL SCAPULAR GROUP. 



'213 





Relation. Anteriorly with the postea-spinatus ; internally 

 with the caput magnum, 

 caput medium ,andpost ea- 

 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. 



ANTEA-SPIXATUS. 

 (Superacromio-trochiterius.)- 



(FiG. 73. a.) 



Occupying the antea- 

 spinatus fossa of the 

 scapula, this muscle is 

 pyramidal in shape, with 

 the base downwards. Fts 

 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- 

 nal trochanter, and one 

 internal, to the summit 

 of the internaltrochanter, 

 of the*numerus. 



fte 



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

 apinatns ; b, Postea-spinatus ; c, Teres externua ; d, Caput 

 magnum ; e, Caput medium ; /, Flexor brachii ; g, Ex- 

 tensor metacarpi magnus ; A, Extensor metacarpi obliqnns; 

 i, Flexor metacarpi externus ; k, Extensor pedis : k', Its 

 tendon ; k", Fibrous band from the suspensory ligament ; 

 ?, Extensor suffraginis ; I', Its tendon. 



