i6o 



Anatomy of the Rabbit. 



of the thorax, the corresponding surfaces are more nearly ventral 

 and dorsal. Of its three borders, one, the superior border (margo 

 superior), is directed toward the occiput; another, the vertebral 

 border (margo vertebralis), toward the vertebral column; and the 

 third or axillary border (margo axillaris), toward the armpit. 

 The corresponding angles are medial (superior), inferior, and 

 lateral (glenoid). The lateral surface bears a stout bony plate, 

 the scapular spine (spina scapulae), which arises from the body of 

 the bone through about two-thirds of its extent, and ends ven- 

 trally in a free projection, the acromion. The posterior margin 

 of the acromion bears a backwardly-directed process, the meta- 



mv. 



Fig. 66. Lateral surface of the left scapula: a., acromion; a.i.. a.l.. and a.m., 

 inferior, lateral, and medial angles; e.g., glenoid cavity; c.s., neck of the scapula; 

 f.s. and f.i., supraspinous and infraspinous fossae; rn., met acromion; m.a.. m.s., and 

 m.v., axillary, superior, and vertebral borders; p.i*, LUifliUld lHocc»s; s.s., scapular 

 spine. 



cromion (processus hamatus). Through the presence of the 

 scapular spine, the lateral surface of the bone is divided into two 

 areas for muscular attachment. One of these, the supraspinous 

 fossa (fossa supraspinata) , lies in front of the spine, the other, 

 the infraspinous fossa (fossa infraspinata), behind it. The 

 infraspinous fossa is the more extensive one. The medial surface, 

 on the other hand, presents a single large shallow depression, the 

 subscapular foss a (fossa subscapulars) , which is triangular in 

 sTiapeandoccupies practically the entire surface. The apex or 

 lateral angle of the scapula, sometimes termed the head ot the 

 bone, is expanded to a considerable extent in comparison with the 



