THE SCAPULA, OR SHOULDER BLADE 



173 



toward its vertebral margin a shallow concavity is seen at its upper part; its centre 

 presents a prominent convexity, while toward the axillary border is a deep groove 

 which runs from the upper toward the lower part. The inner two-thirds of this 

 surface affords origin to the Infraspinatus nuscle; the outer third is only covered 

 by it, without giving attachment to its fibres. This surface is separated from the 

 axillary border by an elevated ridge, which runs from the lower margin of the glenoid 



Capsular 

 ligament 



Coraco-acromial 

 ligament 



FIG. 138. Left scapula. Anterior surface or venter. 



cavity downward and backward to the internal border, about an inch above the 

 inferior angle. The ridge serves for the attachment of a strong aponeurosis which 

 separates the Infraspinatus from the two Teres muscles. The surface of bone 

 between this line and the axillary border is narrow in the upper two-thirds of its 

 extent, and traversed near its centre by a groove for the passage of the dorsal is 

 scapulae vessels; it affords origin to the Teres minor muscle. Its lower third 



