The Skeleton of the Anterior Limb. 



161 



slender portion — the so-called neck of the scapula (collum scap- 

 ulae) — connecting it with the body of the bone. It bears a concave 

 depression, the glenoid cavity (cavitas glenoidalis), for articula- 

 tion with the humerus. The articulating surface is borne chiefly 

 on that part of the bone corresponding to the axillary border, but 

 it also extends in an anterior directum 

 to the base of an overhanging pro- 

 jection, the coracoid process (pro- 

 cessus coracoideus). The tree por- 

 tion of the latter forms a blunt, 

 hook-like projection lying toward the 

 medial surface of the bone. 



THE CLAVICLE. 



The clavicle (clavicula) is imper- 

 fectly developed in the rabbit, con- 

 sisting of a slender, arcuate rod of 

 bone, tipped by cartilage, which lies 

 in the interspace between the manu- 

 brium sterni and the head of the 

 humerus. It occupies only a portion of 

 tiiis interspace, being attached me- 

 dially by the sternoclavicular liga- 

 ment and laterally by the cleido- 

 humeral ligament. 



THE HUMERUS. 



Fig. 67. Anterior surface of the left 

 humerus: c capitulum; c.h., head of 

 humerus; e.l. and e.m., lateral and 

 medial epicondyles: f.r.. radial fossa; 

 s.h., deltoid tuberosity; s.i.. intertuber- 

 cular groove; t.h.. trochlea humeri; 

 t.mi. and t.mj., lesser and greater 

 tubercles. 



The humerus (Fig. 67) is typical 

 of the long bones of che proximal 

 and middle segments of the fore and 

 hind limbs in consisting of a central 

 portion, the body or shaft of the bone, and of proximal and 

 distal extremities for muscle attachment and articulation. The 

 proximal extremity bears on its medial side a smooth, convex 

 projection, the head of the humerus (caput humeri), for articulation 

 with the scapula. The articulation is nominally a ball-and-socket 



