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 sul^jects is thin, irr(>gular, and porous. 



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



Dorsal angle 



Vascular (jroove 



Subscapular fossa 

 Anterior border 



TulK'rosiiij 



Glenoid cavity Coracoid process 



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



It is 



its 



anterior and vertebral borders and lies opposite to the second thoracic spine 

 relatively thin and is about a right angle. 



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

 position can l)e det('nniiu>d rea<lily in the living animal. 



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

 the bone by the neck of the scajnila (('oliuiii scapuUie). It is enlarged, especially 

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

 lation with the head of the iium(>rus. The cavity is oval in outline, and its margin 

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



