90 



THE CAT. 



[CHAP. iv. 



projects freely as a small process terminating in a rounded end, and 

 called the acromion (a) ; but before so terminating, it gives off a 

 backwardly directed lamellar freely projecting process termed the 

 metacromion (m) . 



The anterior border of the scapula (which is rounded and convex) 

 exhibits at its lower end a rounded notch (n). Below this notch 

 there rises a short strongly projecting, much curved, pointed pro- 

 minence, called the coracoid process (Fig. 52, c) . 



The superior border of the scapula (v) is the shortest. It is very 

 slightly convex. 



The axillary border is the longest, and is more or less grooved on 

 its inner aspect (.r). It descends obliquely from the lower end of 



DC. 



Fig. 51. EIGHT SCAPULA, SEEN EXTERNALLY. 



a. Acromion. 



g. Glenoid surface. 



is. Jnfra-spinpus fossa. 



m. Metacromion. 



n. Supra-scapular notch. 



s. Spine. 



ss. Supra-spinous fossa. 

 v. Vertebral border. 

 x. Axillary border. 



! The coracoid process is shown at the right-hand 

 extremity of the figure above, and to the 



left of the letter a. 



the vertebral border to a rounded concave, shallow, articular 

 surface (0), called the glenoid cavity (into which the head of the 

 upper-arm bone is received), and which is overhung in front by the 

 coracoid process (c), while the acromion projects externally to it. 

 The part which supports the glenoid surface is called the neck. 



The anterior and vertebral borders meet in a rounded prominence, 

 while at the junction of the axillary and vertebral borders is a small 

 flattened space for the insertion of a muscle called the teres major. 



The coracoid and acromion arise from distinct centres of ossifica- 

 tion. The coracoid ossification contributes to form the glenoid cavity. 



The CLAVICLE is a very small slender styliform bone, pointed at 

 each end, and suspended in the flesh between the acromion process 

 of the scapula and the manubrium of the sternum, but not touching 

 either of those parts itself. 



3. The HUMERUS is the largest, but not the longest, bone of the 



