62 OUTLI^ES OF EQUINE ANATOMY. 



running obliquely downwards and backwards ; below, and 

 almost parallel to this a roughened ridge, mapping out tlie 

 line of attachment of flexor brachii, may be traced in a cir- 

 cular manner around the whole anterior part of the process. 

 On the inner surface is a ridge with a slight inclination 

 backwards, terminating inferiorly in a small process to which 

 coraco-humeralis is attached. Around the anterior margin 

 of the bone, just above the coracoid process, runs arteria 

 dorsalis scapulae with its accompanying vein and nerve 

 from within outwards, protected by a hand of white fibrous 

 tissue {cor aco- scapular ligament), which extends from the 

 process to about the middle of this margin of the bone ; 

 antea spinatus becomes attached to this ligament exter- 

 nally; subscapularis internally. The roughened anterior 

 margin at its superior part affords attachment to pectoralis 

 anticus and antea spinatus. The postero-superior margin 

 of the bone is rough and cancellous for attachment of the 

 scapular cartilage of elongation. This is a thin piece of 

 fibro-cartilage, extending upwards for about three inches, 

 having a tendency to ossification at its attached margin. 

 It becomes very thin superiorly, and curls inwards. Ante- 

 riorly its margin has a backward inclination, posteriorly it 

 is continued as a thin piece of cartilage beyond the pos- 

 terior angle of the bone. Its external surf ace affords attach- 

 ment, anteriorly to antea spinatus, centrally to postea 

 spinatus, and posteriorly to serratus magnus. To its inner 

 surface the rhomboidei are attached. The postero-supeiior 

 margin anteriorly forms an obtuse angle with the anterior 

 margin. Posteriorly, in a corresponding manner, it joins 

 the postero -inferior margin, at the extreme superior part 

 of which is a triangular surface roughened for attachment 

 of serratus magnus. From this the posterior margin of the 

 bone makes a curve in a downward direction to the inferior 

 angle. Superiorly this curve presents a sharp edge, to 

 which teres externus and internus, caput magnum of the 

 triceps extensor brachii and scapulo-ulnaris are attached. 

 Inferiorly it is more rounded, but still, for the most part, 

 roughened ; centrally for attachment of caput magnum, 

 around which the attachment of scapulo-humeralis extends 

 in a peculiar manner, at the extreme inferior part of 

 scapulo-humeralis posticus, externally of scapulo-humeralis 

 externus, internally of subscapularis. About four inches 

 from its inferior part, in some cases, we find a groove 



