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 (4). It gives attachment to muscles and is marked 
Fic. 47.—HUMERUS, VENTRAL SIDE. Fic. 48.—Humervs, MEDIAL SIDE, 
a, head; 4, greater tuberosity; ¢, lesser tuberosity; ¢@, bicipital groove; e, pectoral 
ridge; /, deltoid ridge; g, rough area for insertion of latissimus dorsi and teres major; 
A, nutrient foramen; 2, capitulum; 7, trochlea; 4, coronoid fossa; 7, radial fossa; 7, 
medial epicondyle; 9, lateral epicondyle; 7, 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 (¢), also for muscular attachment. 
Between the greater and lesser tuberosities on the ventral 
