THE SCAPULA. 109 



the attachment of the coraco-acromial ligaments. The 

 posterior surface of the scapula above the spine forms 

 the supra-spinous fossa ; the surface below the spine forms 

 the infra-spinous fossa; it is smooth, and serves for the 

 origin of the infra-spinatus muscle. The anterior sur- 

 face is concave and shallow, and constitutes the venter of 

 the scapula; it is crossed by two or three curved lines. 



FIG. 51. THE SCAPULA, ANTERIOR SURFACE. 



The subscapular muscle arises from the whole extent of 

 this surface. The superior border is thin, concave, and 

 presents at its middle a notch, the supra-scapular, 

 which is converted into a foramen by the transverse liga- 

 ment ; it transmits the supra-scapular nerve. Projecting 

 from the outer portion of the superior border at its junc- 

 tion with the base is the coracoid process, a strong, finger- 



