MUSCLES OF THE FRONT OF THE TRUNK. 
479 
is called the humerus ; this has a large rounded head, which 
is received into the glenoid cavity of the scapula; whilst its 
lower end is rather flattened, so as to articulate with the two 
bones of the fore-arm in the hinge-joint of the elbow. The 
Fig. 227 . —Muscles of the Front op the Trunk, the Superficial Layer 
BEING SHOWN ON THE LEFT SIDE OF THE FIGURE, THE MIDDLE LAYER ON THE 
RIGHT. 
1, sternum; 2 , sternal portion of the pectoralis major; 3 , clavicular portion of the 
same muscle; 4, space between the deltoid and pectoral muscles; 5 , deltoid; 6 , 6, 
clavicles; 7, external oblique; 8, digitations of the serratus magnus; 9, 9, latissi- 
mus dorsi; 10, aponeurosis of the external oblique; 11, linea alba; 12, umbilicus; 
13 , pectoralis minor; 14, 14, crests of the iliac bone; 15 , symphysis of the pubis ; 
16, crural arches; 17, rectus abdominis; 18, inferior oblique; 20, internal inter¬ 
costal; 21, external intercostal; 22, infra-clavicular; 23 , coracoid process; 24 , in¬ 
ferior border of the internal oblique and transversalis muscles; 25 , short head 
of the biceps ; 26 , long head of the biceps ; 27, biceps; 28, sternomastoid; 32 , 
adductor of the thigh; 33 , rectus femoris. 
