458 



THE MUSCLES AND FASCIA 



or the seventh, or both; and from the aponeurosis of the External oblique muscle 

 of the abdomen. The fibres from this extensive origin converge toward its in- 

 sertion, giving to the muscle a radiated appearance. Those fibres which arise 

 from the clavicle pass obliquely outward and downward and are usually separated 

 from the rest by a cellular interval; those from the lower part of the sternum, and 

 the cartilages of the lower true ribs, pass upward and outward, while the middle 

 fibres pass horizontally. They all terminate in a flat tendon, about two inches 



FIG. 347. Muscles of the thorax and front of the arm. Superficial view. 



broad, which is inserted into the outer bicipital ridge of the humerus. This tendon 

 consists of two "laminae, placed one in front of the other, and usually blended 

 together below. The superficial, the thicker, receives the clavicular and upper 

 half of the sternal portion of the muscle; and its fibres are inserted in the same 

 order as that in which they arise; that is to say, the outermost fibres of origin from 

 the clavicle are inserted at the uppermost part of the tendon; the upper fibres 



