MUSCLES OF THE ARM. 



FIG. 17. The muscles on the 

 back of the hand, forearm, and 

 lower half of the arm, as ex- 

 posed on dissecting away the 

 skin. 



8. The Parts of a Muscle. In 

 its most common form, a muscle 

 consists of a red soft middle 

 part, called its belly, which tapers 

 towards each end and passes into 

 very tough white cords named 

 tendons or sinews, The tendons 

 may be compared to ropes, tying 

 the working part of the muscle, 

 namely its belly, to the bones 

 which the muscle has to move. 

 The hard cord-like tendons of 

 the muscles which bend the 

 fingers,can easily be felt through 

 the skin in front of the wrist. 



9. The Muscles of the Arm, 

 some of which are shown in 

 Fig. 17, may be taken to il- 

 lustrate the structure and ar- 

 rangement of nearly all muscles. 

 We see that some (8, n, 12) pass 

 over the elbow-joint from arm to 

 forearm. Others (14, 15, 16, 17, 

 18) start from the ulna or radius 

 and pass over the wrist-joint to 

 the hand. Near the wrist most 

 of them end in slender tendons, 

 which are kept in place by a 

 strong cross-band of connective 

 tissue (++). The skin has been 

 dissected away from the back 



8. What parts has a muscle ? Their uses ? 

 . Describe the course of some of the arm-muscles. 



