THE ANTERIOR LIMBS. 99 



a pyramidal nucleus, base inferior, and flattened before and behind. In the 

 Horse, it appears at the centre of the cavity towards the seventh or eighth month ; 

 it increases and pushes forward the coracoid process beyond the articular sur- 

 face. In about nine or ten months it is fused with the principal part of the bone, 

 and in about a year with the coracoid nucleus. In the Ass and Mule, the glenoid 



Fig. 59. 



Fig. 60. 



SCAPULA OF THE HORSE (EXTERNAL FACE). 1, Subscapular fossa ; 2, anterior triangular 



1, Tuberosity of the spine ; 2, supra-spinous f ^face ; 3 posterior triangular surface ; 



fossa ; 3, infra-spinous fossa ; 4, nutrient *' *' vascular furrow ; 5, glenoid cavity ; 



foramen; 5, 5, 5, linear imprints for the ^ base of the coracoid process (insertion 



insertion of the coraco-humeralis ; 6, of the coraco-humeralis). 



tubercle for the same ; 7, border of the 



glenoid cavity ; 8, coracoid process ; 9, 



cervical angle; 10, dorsal angle; 11, 



cartilage of prolongation. 



nucleus appears about the fourth month, and its evolution is completed at the 

 seventh or eighth month. 



In the Ass, the scapula is usually more curved than in the Horse, while the 

 greater development of its superior border, and the more considerable constric- 

 tion of its neck, give it a peculiar appearance. It represents a wider and shorter 



