THORACIC LIMBS. 65 



a smooth ovoid articular facet by which the bone articulates 

 with the glenoid cavity of the scapula. The head is not 

 separated from the body by a distinct anatomical neck as in the 

 human humerus. 



Along the lateral border of the proximal end of the shaft is 

 a high rough ridge semicircular in side view, the great 

 tuberosity (b}. It gives attachment to muscles and is marked 



FIG. 47. HUMERUS, VENTRAL SIDE. FIG. 48. HUMERUS, MEDIAL SIDE. 



#, head; 3, greater tuberosity; c, lesser tuberosity; d, bicipital groove; e, pectoral 

 ridge;y. deltoid ridge; g, rough area for insertion of latissimus dorsi and teres major; 

 A, nutrient foramen; t, capitulum;/. trochlea; /, coronoid fossa; m, radial fossa; . 

 medial epicondyle; o, lateral epicondyle; y, supracondyloid foramen. 



on its dorsal border by a deep depression for the tendon of the 

 infraspinatus muscle. On the medial margin of the proximal 

 end closely associated with the head is a smaller elevation, the 

 lesser tuberosity (c), also for muscular attachment. 



Between the greater and lesser tuberosities on the ventral 



