54 
ELEMENTS OF MAMMALIAN ANATOMY. 
mata, where it articulates at one end with the scapula, 
forming part of the glenoid cavity, and at the other end 
Fic. 32. CRANIAL As- 
pect oF RicHt Hu- 
MERUS. 
bl, Bicipital groove; 
cr, supracondyloid 
ridge; cp, capitel- 
lum for articulation 
with the radius; dr, 
deltoid ridge; et, 
external condyle; 
gt, greater tuber- 
osity; it, internal 
condyle; /t, lesser 
tuberosity; sp, su- 
pracondyloid fora- 
men or entepicon- 
dylar foramen; sr, 
supinator ridge; tr, 
trochlea for artic- 
ulation with ulna. 
In the other 
mammals the coracoid is represented 
with the presternum. 
by the coracoid process of the scapula, 
which ossifies from a separate center. 
In many of the lower vertebrates a dis-’ 
tinct coracoid is present. 
The humerus is the bone of the 
arm or brachium. It articulates prox- 
imally with the glenoid cavity of the 
scapula (Fig. 21) and distally with 
the ulna and radius. It consists of 
three parts: the proximal extremity 
bearing the fead, the middle portion 
or shaft, and the distal extremity (Fig. 
32). The greater and lesser tuber- 
osities separated by the bicipital groove 
lodging the tendon of the biceps mus- 
cle, are the two processes on the proxi- 
mal extremity. The former is the 
larger and more craniad and serves for 
the insertion of the supraspinatus mus- 
cle (Fig. 49). The distal extremity is 
marked by two important projections, 
the external and internal condyles. 
Extending proximad from the external 
condyle is the supinator ridge. Proxi- 
mad of the internal condyle is the 
supracondyloid foramen transmitting 
the median nerve and brachial artery 
(Figs. 72 and 89). The olecranon 
fossa is the deep cavity on the caudal 
aspect of the bone, opposite the coronoid fossa. The articu- 
