74 



SCAPULA. 



Fig. 28 * 



formed partly by the base of the coracoid process, is the supra-sca- 

 pular notch, for the transmission of the supra-scapular nerve. 



The inferior or anterior border is thick, and marked by several 

 grooves and depressions ; it terminates superiorly at the glenoid 

 cavity, and inferiorly at the inferior angle. Immediately below the 

 glenoid cavity is a rough ridge, which gives origin to the long head 

 of the triceps muscle. Upon the posterior surface of the border is a 

 depression for the teres minor ; and upon its anterior .surface a 

 deeper groove for the teres major : near the inferior angle is a pro- 

 jecting lip, which increases the surface of origin of the latter muscle. 

 The posterior border, the longest of the three, is also named the 

 base. It is intermediate in thickness between the superior and 

 inferior, and convex, being considerably inflected forwards towards 

 the superior angle. 



The anterior angle is the thickest part of the bone, and forms the 



head of the scapula ; it is immediately 

 surrounded by a depressed surface, 

 the neck. The head presents a shal- 

 low pyriform articular surface, the 

 glenoid cavity, having the pointed ex- 

 tremity upwards ; and at its apex is a 

 rough depression, which gives attach- 

 ment to the long tendon of the biceps. 

 The superior angle is thin and pointed. 

 The inferior angle is thick and smooth 

 upon the external surface for the ori- 

 gin of the teres major, and for a large 

 bursa over which the upper border of 

 the latissimus dorsi muscle plays. 



The spine of the scapula crosses the 

 upper part of its dorsum ; it com- 

 mences at the posterior border by a 

 smooth triangular surface over which 

 the trapezius glides upon a bursa, and 

 terminates at the point of the shoulder 



in the acromion process. The upper border of the spine is rough 

 and subcutaneous, and gives attachment by two projecting lips to 

 the trapezius and deltoid muscles. 



The acromion is somewhat triangular and flattened from above 

 downwards; it overhangs the glenoid cavity, the upper surface 

 being rough and subcutaneous, the lower smooth and correspond- 

 ing with the shoulder-joint. Near its extremity is an oval articular 



* 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 inferior border. 6. The head of the scapula and glenoid cavity. 7. The 

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



