76 



THE SKELETON OF THE HORSE 



and is pitted by impressions into which the cartilage fits. The cartilage is the 

 unossified part of the foetal scapula. Its lower edge fits the depressions and eleva- 

 tions of the bone. It thins out toward the free edge, which is convex and lies 

 alongside of the upper parts of the vertebral spines. In front it continues the line 

 of the scapula, but behind it forms a rounded projection. The lower part of the 

 cartilage undergoes more or less ossification, so that the vertebral border of the 

 bone in old subjects is thin, irregular, and porous. 



The anterior or cervical angle (Angulus cranialis) is at the junction of the 



■■'■^. 



^ 



^^' 



Dorsal angle -^ ,. 



m 



Vascular groove 



Subscapular fossa 

 Anterior border 



rosity 



Glenoid cavity 



Coracoid process 



Fig. 42. — Left Scapula of Horse, Costal Surface. — (After Schmaltz, .\tlas d. Anat. d. Pferdes.) 



anterior and vertebral borders and lies opposite to the second thoracic spine. It is 

 relatively thin and is about a right angle. 



The posterior or dorsal angle (Angulus caudalis) is thick and rough; its 

 position can be determined readily in the living animal. 



The inferior or articular angle (Angulus glenoidalis) is joined to the body of 

 the bone bj^ the neck of the scai)ula (Collum scapuhe). It is enlarged, especially 

 in the sagittal cUrection. It bears the glenoid cavity (Cavitas glenoidalis) for articu- 

 lation with the head of the hinnerus. The cavity is oval in outline, and its margin 

 is cut into in front by the glenoid notch (Incisura glenoidalis), and is rounded off 



