ioo 



THE UPPER EXTREMITY 



the ramus superficial and the ramus profundus. These 

 nerves may now be studied in so far as they lie on the 

 volar aspect of the forearm. The nervus profundus 

 soon disappears from view by passing backwards on the 

 lateral side of the radius through the fibres of the supinator 

 muscle. 



The ramus superficial proceeds distally under cover 

 of the fleshy belly of the brachioradialis. In the middle 



V. cephalic; 



N. cutan. antib. lat. ^-*^ 

 M. brachior 



N. radialis 



ramus superfic. 



(O.T. radial) 



M. ext. carp. /^ 

 rad. long. "T* 



N. cutan. antib. med. 

 N. medianus 



M. palmaris longi 



\ 



N. interosseus dorsahs' 



(O.T. posterior interosseous) 



M. ext. dig 



V, basilica 



M. supinator 



M. supinat 



N. cutan. antib. dorsalis 



M. anconaeus 

 Tendon m. biceps brachii 



FIG. 41. Transverse section through the Proximal Third of the 

 left Forearm. 



third of the forearm it lies along the lateral side of the 

 radial artery, and then leaves it by winding round the lateral 

 margin of the limb, under cover of the tendon of the 

 brachioradialis. It has been traced in its farther course 

 (p. 96). The ramus superficialis is a purely cutaneous nerve, 

 and gives off no branches until it gains the dorsal aspect of 

 the lower end of the forearm. 



Muscles. The muscles on the volar aspect and medial 

 border of the forearm are arranged in a superficial and a 

 deep group. They comprise the flexors of the wrist and 

 fingers, and also the pronators. In the superficial group 



