SKELETON 1 1 



into a supra- and infra-spinous fossa. Ante- 

 riorly the spine bears two processes, the anteriorly- 

 directed acromion process and the posteriorly- 

 directed mctacromion process. The concave inner 

 surface of the scapula forms the subscapular fossa. 

 Anteriorly the scapula ends in a concave articular 

 surface, the glenoid cavity. The corocoid process 

 is a curved projection extending from the anterior 

 edge of the glenoid cavity. (Plate I., M.) 



3. The Humerus is the uppermost and largest of 

 the bones of the fore-leg. At its proximal end 

 the humerus has two prominences, of which the 

 outer and larger is the greater tuberosity, the inner 

 and smaller is the lesser tuberosity. Between the 

 two tuberosities is a rounded surface for articula- 

 tion with the scapula, known as the head of the 

 humerus. Along the anterior side of the upper 

 part of the shaft of the humerus is a slightly 

 roughened elevation, the deltoid ridge. The supra- 

 condyloid foramen is an elongated opening in the 

 lower part of the humerus. The olecranon fossa 

 is a deep depression on the posterior side of the hu- 

 merus just above its articular surface. (Plate I., N.) 



4. The Ulna and Radius are the two bones which 

 articulate with the humerus at its distal end. The 

 ulna is the larger and has a prominent process, 

 the olecranon, extending beyond its articulation 

 with the humerus. Below its articulation with 

 the humerus is the smaller cor onoid process, which 

 articulates with the radius. (Plate I., o. and p.) 



