Fig. 34 



dorsuni ; it commences at the posterior border by a smooth triangular 

 surface over which the trapezius glides upon a bursa, and terminates 

 at the point of the shoul- 

 der in the acromion process. 

 The upper border of the 

 spine is rough and subcu- 

 taneous, and gives attach- 

 ment by two projecting lips 

 to the trapezius and del- 

 toid muscles; the surfaces 

 of the spine enter into the 

 formation of the supra and 

 infra-spinous fossae. The 

 nutritious foramina of the 

 scapula are situated in the 

 base of the spine. 



The acromion is some- 

 what triangular and flat- 

 tened from above down- 

 wards ; it overhangs the 

 glenoid cavity, the upper 

 surface being rough and 

 subcutaneous, the lower 

 smooth and corresponding 

 with the shoulder-joint. 

 Near its extremity, upon 

 the anterior border, is an 

 oval articular surface, for 

 the end of the clavicle. 



The coracoid process is a thick, round, and curved process of bone, 

 arising from the upper part of the neck of the scapula, and overarching 

 the glenoid cavity. It is about two inches in length and very strong ; 

 it gives attachment to several ligaments and muscles. 



Development. By six centres; one for the body, one for the 

 coracoid process, two for the acromion, one for the inferior angle, and 

 one for the posterior border. The ossific centre for the body appears in 

 the infra-spinous fossa at about the same time with the ossification of 

 the vertebrae ; for the coracoid process during the first year ; the acro- 

 mion process at puberty ; the inferior angle in the fifteenth year ; and 

 the posterior border at seventeen or eighteen. Union between the 



* A posterior view of the scapula. 1. The supra-spinous fossa. 2. The 

 infra-spinous fossa. 3. The superior border. 4. The supra-scapular notch. 

 5. The anterior or axillary border. 6. The head of the scapula and glenoid 

 cavity. ". The inferior angle. 8. The neck of the scapula, the ridge opposite 

 the number gives origin to the long head of the triceps. 9. The posterior 

 border or base of the scapula. 10. The spine. 11. The triangular smooth 

 surface, over which the tendon of the trapezius glides. 12. The acromion 

 process. 13. One of the nutritious foramina. 14. The coracoid process. 



