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.—Musctzs oF THE FRonT OF 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, ‘ 
