74 ANATOMY AND PHYSIOLOGY FOR NURSES 



little finger. Action, extensor of little finger. Nerve, 

 posterior interosseous. 



Extensor Carpi Ulnaris. Origin, by two heads: First 

 head, external condyle of humerus ; second head, posterior 

 border of ulna. Insertion, base of fifth metacarpal bone. 

 Action, extends wrist. Nerve, posterior interosseous. 



Anconeus. Origin, back and external condyle of hu- 

 merus". Insertion, olecranon process and shaft of ulna. 

 Action, extends forearm. Nerve, musculospiral 



Supinator Brevis. Origin, external condyle o nerus 

 and oblique line of ulna. Insertion, neck of rad ^nd its 

 bicipital tuberosity. Action, supinates the forearm. 

 Nerve, posterior interosseous. 



Extensor Ossis Metacarpi Pollicis. Origin, back of 

 radius and ulna and interosseous membrane. Insertion, 

 base of metacarpal bone of thumb and fascia. Action, 

 extends the thumb. Nerve, posterior interosseous. 



Extensor Brevis Pollicis. Origin, back of radius. 

 Insertion, inner part of the base of first phalanx of 

 thumb. Action, extends the first phalanx of thumb and 

 abducts the wrist. Nerve, posterior interosseous. 



Extensor Longus Pollicis. Origin, posterior part of the 

 ulna and interosseous membrane. Action, extends second 

 phalanx of the thumb and abducts the wrist. Nerve, 

 posterior interosseous. 



Extensor Indicis. Origin, posterior part of ulna. Inser- 

 tion, second and third phalanges of index-finger. Action, 

 extends the index-finger. Nerve, posterior interosseous. 



MUSCLES OF THE HAND 



Abductor pollicis. Abductor minimi digiti. 



Opponens pollicis. Flexor brevis minimi digiti. 



Flexor brevis pollicis. Opponens minimi digiti. 



Abductor obliquus pollicis. Lumbricales. 



Adductor transversus pollicis. Dorsal interossei (4). 



Palmaris brevis. Palmar interossei (3). 



