EXTERNAL SCAPULAR GROUP. 



213 



Helat Ion. — Anteriorly 

 with the caput magnum, 

 caput medium,andpostea- 

 spinatus ; externally with 

 the scapular fascia. 



A ction . — To abduct 

 the humerus, and rotate 

 it outwards; when acting 

 with the teres internus 

 io flex the shoulder joint. 



with the postea-spinatus ; internally. 



ANTEA-SPINATUS. 



(Superacro?7iio-trochiterius.) 



(Fig. 78, a.) 



Occupying the antea- 

 spinatus fossa of the 

 scapula, this muscle is 

 ppamidal 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- 

 nal trochanter, and one 

 internal, to the summit 

 of the internal trochanter, 

 of the humerus. 



Fig. 78. 



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

 spinatus ; b, Fostea-spinatas ; c, Teres extemus ; d, Caput 

 magnum ; e, Caput medium ; /, Flexor brachii ; g, Extensor 

 metacarpi magnus ; ^, Extensor metacarpiobliquus;i,Flexor 

 metacarpi extemus ; k, Extensor pedis ; kf. Its tendon ; fc" 

 Fibrous band from the suspensory ligament ; I, Extensor 

 suffraginis ; V, Its tendon. 



