180 



Muscles of the Upper Extremity. 



La, 



First Layer: 



M. pronator radii teres. Orig. : Internal 

 condyle of the humerus and coronoid pro- 

 cess of the ulna. Insert. : Middle of the 

 outer surface of the radius. 



M. flexor carpi radialis s. radialis inter- 

 ims. Orig. : Internal condyle of the humerus. 

 Insert. : Base of the metacarpal bone of 

 the index finger. (Pronator and flexor of 

 the hand.) 



M. palmar is longus. Orig.: Internal con- 

 dyle of the humerus. Insert. : Aponeurosis 

 palmar is (palmar fascia). (Tensor of the 

 palmar fascia and flexor of the hand.) 



M. flexor carpi ulnaris s. ulnaris inter - 

 nus. Orig.: Internal condyle of the humerus, 

 olecranon, and posterior border of the ulna. 

 Insert,: Pisiform bone (see Fig. 241, 248). 

 (Flexor and abductor of the hand.) 



Second Layer: 



M. flexor digltorum sublimis s. perforatus. 

 Orig. : Internal condyle of the humerus, 

 internal lateral ligament of the elbow-joint, 

 coronoid process of the ulna and radius be- 

 low the tuberosity. Insert.: By four tendons, 

 which, in the region of the first phalanx, 

 are perforated by the tendons of the deep 

 flexor, into the sides of the second phalanges 

 of the second to the fifth fingers (see 

 Fig. 247, 248). (Flexor of the second 

 238. The Muscles phalanges.) 



at the Inner Side 

 of the Forearm. 



Proc. 

 etyLrad 



