BONES, MUSCLES, EXER 



1. Biceps, or two-headed flexor of thl 



c. Brachial muscle, extends from the middle of the hume- 

 rus to the front side of the lower arm. It aids in bending 

 the elbow. 



d. Supinator, turns the hand upward. 



e. Triceps, or three-headed extensor of the arm. 



f. Trapczius, draws the shoulder upward, backward, and 

 downward. 



g. Latissimus dorsi, or broadest muscle of the back, draws 

 the arm backward and downward. 



h. Serratus, or saw-edged muscle. One side has nine 

 fleshy teeth, which are attached to the upper nine ribs in 

 front : the opposite edge of the muscle is attached to the 

 front and outer edge of the shoulder-blacjLe. It draws the 

 shoulder-blade forward, and when this bone is fixed by the 

 other muscles, it aids in lifting the ribs. 



i. External oblique of the abdomen, aids in expiration. 

 ' k. Glutens maximus, or great gluteal muscle, straightens 

 the hip. 



I. Glutens medius, or middle gluteal muscle, extends from 

 the back part of the pelvis to the back and outer part of the 

 thigh bone. It draws the thigh outward and backward, and 

 rolls it outward. 



m. Sartorius, or tailor's muscle, crosses the leg. 



n. Vastus internus, straightens the leg. 



o. Vastus externus, straightens the leg. 



p. Rectus, straightens the leg. 



q. Tendon or cord forming the outer ham-string. 



r. Tendon forming the inner ham-string. 



s. GastrocnemiuS) forms the calf of the leg, and straight- 

 ens the ankle. 



