BONES, MUSCLES, EXERCISE, AND REST. 263 



The supinator, XLIX. d, LI d, extends from the outer 

 ' side of the humerus and the outer bone of the fore-arm to the 

 inner bone; it rolls the arm outward, and turns the hand 

 upv\ ard. 



The flexors of the wrist, XLIX. f, Ji, and the long palmar 

 muscle, XLIX. g, extend from the lower end of the upper 

 arm, and send tendons to the bones of the wrist and hand. 

 They bend the wrist. 



The pectoral muscle, XLIX. i, is attached to the breast 

 bone and to some of the ribs in front, and extends back to 

 the upper and inner part of the humerus. It moves the arm 

 forward and upward obliquely. 



The external oblique, XLIX. k, LI. i, arises from the edge 

 of eight of the lower ribs, and passing downward and forward 

 it covers the abdomen in front, and is attached below to the 

 pelvis. It supports the abdomen, and, by its contractions, it 

 presses upon its contents and forces them and the diaphragm 

 upward in expiration, ( 286.) 



The semilunar line, XLIX. /, and the tinea alba, XLIX. m t 

 or white band, are layers of gristly matter extending from the 

 breast bone to the pelvis. They give support to the abdom- 

 inal muscles. 



The sartorius, or tailor's muscle, XLIX. o, LI. m, ex- 

 tends from the hip bone over and in front of the thigh, and is 

 joined to the inside of the bone of the leg, below the knee. 

 It aids in bending the thigh: it rolls the hip joint, and lifts 

 one leg over the other, as tailors sit. 



The gracilis, XLIX. q, assists the tailor's muscle. 



The muscle, XLIX. p, aids in turning the thigh outward. 



The psoas and iliac muscles, XLIX. r, u, are attached to 

 the back bone, and, passing over the pelvis, ar3 joined to the 

 thigh bone. They bend the thigh on the trunk. 



The pectineus and triceps, or three-headed muscles, XLIX. 

 s, t, extend from the front part of the pelvis to the inner side 

 of the thigh bone. They assist in bending the thigh, and in 

 'rolling it outward. . 



The rtcpis, }LIX. w, LI. p, is attached to the front part 



