ACTION OF MUSCLE GROUPS 



127 



LARGE MUSCLES CLASSIFIED ACCORDING TO THEIR MOST 

 FREQUENT ACTION (Continued) 



REGION. 



ACTION. 



WRIST. 



HAND. 



To flex wrist 



To extend wrist. 



To flex fingers. 



To extend fingers. 



MUSCLES. 



To flex thumb 



To extend thumb . . 



THIGH, 



To flex thigh 



To extend thigh 



(also to extend trunk) 



To rotate outward. 



LEG.. 



To rotate inward. . 



To abduct. . 

 To adduct.. 

 To flex leg.. 



ANKLE 



To extend leg . 



Rotation outward. 

 Rotation inward. . 

 To flex ankle. . 



FOOT. 



To extend ankle. . 

 To flex toes. . 



To extend toes. 



Flexor carpi radialis. 

 Flexor carpi ulnaris. 

 Extensor carpi radialis 



(long and short). 

 Extensor carpi ulnaris. 

 Flexor digitorum (sub- 



lim.). 



Flexor digitorum (pro- 

 fund.). 

 Extensor digitorum 



(com.). 

 Extensors of index and 



little fingers 

 Thenar group. 

 Three extensors of 



thumb. 

 Ilio-psoas. 

 Gluteus maximus. 

 Biceps femoris. 

 Semitendinosus. 

 Semimembranosus. 

 Glutei-med. and min. 

 Sartorius. 

 Four adductors. 

 Two obturators. 

 Gluteus min. 

 Tensor fasciae latae. 

 Adductor magnus (long 



fibers of). 

 Three glutei. 

 Four adductors. 

 Biceps femoris. 

 Semitendinosus. 

 Semimembranosus. 

 Sartorius. 

 Quadriceps femoris (rec- 



tus and three vasti). 

 Sartorius. 

 Biceps. 

 Tibialis ant. 

 Peroneus tertius. 

 Tibialis post. 

 Peronei (long and short). 

 Flexor digitorum 



(longus). 



Flexor pollicis (longus). 

 Extensor digitorum 



(longus). 

 Extensor hallucis 



(longus). 



