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, slightly 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 
Fig. 183.—Lerr Scapuna or Pic; Larerat View. 
1, Anterior angle; 6, posterior angle; c, anterior border; d, posterior border; e, neck; f, glenoid cavity; g, tuber 
scapule; 1, spine; 2, tuber spine; 3, acromion; 4, supraspinous fossa; 5, infraspinous fossa; 6, cartilage. 
aright angle. The neck is well defined. The rim of the glenoid cavity is rounded 
and not notched. The tuber scapule is just above the antero-medial part of 
the glenoid cavity and bears no distinct 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 f 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 
