110 PRACTICAL ANATOMY. 



shaped process of bone which curves upward, forward, 

 and outward above the glenoid cavity; it is rough, for the 

 attachment of muscles and ligaments, and serves also for 

 the protection of the shoulder-joint. The internal or 

 vertebral border is the longest; it is slightly convex, and 

 presents two well-marked lips, anterior and posterior, 

 the anterior giving attachment to the serratus magnus 

 muscle, the posterior to the supra- and infra- spinous 

 muscles. The external or axillary border is thick and 

 strong and corded in appearance; it is slightly concave, 

 but irregular. It commences above at the base of the 

 scapula and terminates at the inferior angle, and affords 

 attachment to the triceps above, and to some of the fibres 

 of the teres minor, teres major, and subscapular muscles. 

 The superior angle is at the junction of the superior with 

 the vertebral border; it is thin, and serves for the attach- 

 ment of the levator anguli scapulas and some of the 

 fibres of the serratus magnus. The inferior angle at the 

 junction of the vertebral with the axillary border is a 

 blunt, triangular portion of bone, which gives attach- 

 ment posteriorly to the- teres major and some fibres of 

 the latissimus dorsi, anteriorly to the fibres of the ser- 

 ratus magnus. The inferior angle is crossed posteriorly 

 by the fibres of the latissimus dorsi; in extreme mus- 

 cular action this muscle may slip beneath the inferior 

 angle. The base, situated at the junction of the superior 

 with the axillary border, supports the glenoid cavity, 

 which is a shallow, oval-shaped depression for articula- 

 tion with the head of the humerus. The glenoid cavity 

 looks outward and slightly upward, and extends from 

 the base of the coracoid process to the beginning of the 

 axillary border. Its long diameter is vertical. It is 

 broader below than above, and presents a well-marked 

 rim, to which the glenoid ligament is attached. Just 



