176 



SKELETON OF THE PIG 



BONES OF THE THORACIC LIMB 



The scapula is very wide, the index being about 1 : 0.7. The spine is tri- 

 angular and is very wide in its middle, which curves backward over the infra- 

 spinous fossa and bears a large tuberosity. Its lower part bears a small projection 

 (rudimentary acromion). The anterior border is strongly convex in profile, sinuous 

 when viewed from the front, and thick and rough in its middle. The posterior 

 border is wide, shghtly concave, and bears a rough outer lip. The vertebral border 

 is convex, and the cartilage is not so extensive as in the horse and ox. The anteri- 

 or angle is thin and bent medially a little. The posterior angle is thick and is about 



9 f 



Fig. 183. — Left Sc^pl-la op Pig; Lateral View. 

 a, Anterior angle; b, posterior angle; c, anterior border; d, posterior border; e, neck; /, glenoid cavity; p, tuber 

 scapuliE: 1, spine; 2, tuber spinae; 3, acromion; 4, supraspinous fo-ssa; 5, infraspinouj fossa; 6, cartilage. 



a right angle. The neck is well defined. The rim of the glenoid cavity is rounded 

 and not notched. The tuber scapulae is just above the antero-me'dial part of 

 the glenoid cavity and bears no cUstinct coracoid process; it unites with the rest of 

 the bone at about one year. 



The humerus has an appearance in profile somewhat like an italic / minus the 

 cross-bar; this is due to the marked backward and forward inclination of the prox- 

 imal and distal ends respectively. The shaft is decidedly compressed from side to 

 side. The medial surface is extensive and flattened; it is separated from the 

 anterior surface by a distinct border, and bears no teres tubercle. The musculo- 

 spiral groove is shallow. The deltoid tuberosity is small, and there is a larger 

 rounded eminence midway between it and the lateral tuberosity. The nutrient 



