194 



THE NERVOUS SYSTEM. 



Fig. 129. 



II. The Nervus tibialis (Figs. 128 II, 129 T) passes backwards 

 and inwards to supply the extensors of the foot and the flexors of 

 the toes. Its branches are : 



(a) The R. cutaneus cruris posterior (Figs. 128 and 129 ct), ac- 

 companied by an artery and vein, passes to the skin of the calf, 

 (i) A twig to the upper part of the gastrocnemius (Fig. 129 g'}. 



The main nerve, after supplying 

 this twig, bifurcates to form the 

 next two nerves. 



(<?) The Nervits sitralis (Figs. 

 128, 8; 129 s) runs downwards 

 on the inner border of the M. 

 gastrocnemius and gives off : 



1 i ) A twig' (g"} to the upper 

 third of the muscle. 



(2) The liamus cutaneus me- 

 dius (cs] is given off below the 

 middle of the M. gastrocnemius ; 

 it passes to the skin of the 

 lower third of the leg. After 

 giving off the latter branch, the 

 N. suralis runs downwards along 

 the inner aspect of the Tendo 

 acliillis to the Aponeurosis plan- 

 taris of the sole of the foot 

 as far as the calcar, and gives 

 off : 



dv]I[ 



Nerves of the leg and sole of the foot. 

 Branch to the M. abduct, digit. V. 

 Branch to the M. adduct. digit. V. 

 M. rectus anterior. 

 M. biceps. 



Ramus cutaneus medius. 

 Ramus cutaneus cruris posterior. 

 Ramus digitalis volaris I. 

 Branch supplying R. digit, volaris I 



and II. 



vl 1 1 Second branch of the N. tibialis. 

 ^'5 Branch to the M. flex. brev. digit. V. 



Branches to the M. plantaria and the 



M. flexor digitormn. 

 Branch to the M. gastrocnemius. 

 Branch to the M. gastrocneinius. 

 N. peroneus. * 



N. suralis. 



M. semimembranosus. 

 Nervus tibialis. 



cs 

 ct 



dvl 

 dvll 



flp 



</' 

 }i" 



.tin 

 T, t 



