THE SPINAL NERVES. 195 



• (3) Branches [flp] to the 'Muse, plantaris and the M. flexor 

 digitorum. 



(4) A branch to the 31. abchictor hallucis. 



(5) The i?. digitalis volaris I (dvl) supplies the inner side of the 

 first toe by its terminal twig. 



(d) The Nervus tibialis (Fig. 129 t) passes downwards on the 

 hinder surface of the tibio-fibula^ sinks into the M. tibialis jmsticus 

 to appear again at its hinder border ; it then runs over the ankle- 

 joint into the sole of the foot, where it lies midway in the space 

 between the two Ossa tarsi and between the M. extensor tarsi and the 

 M. abductor digiti I longus ; the nerve then i-uns downwards in the 

 groove of the small Os tarsi and divides to form three branches : — 



(i) The first branch [dvll] runs to the space between the second 

 and third fingers, where it bifurcates : — 



(a) The Bauti digital, volaris /run transversely over the muscles 

 of the second toe, supply the muscles of the first toe, and bifur- 

 cate to form the H. digital, volaris I and //. 



(/3) The Bam. digit, volar, //divides in the space between the 

 second and third fingers to supply the Flex, plialang. and the adjacent 

 sides of these toes. 



(2) The second branch [dvlll) runs over the M. Jlex. metatarsi of 

 the third toe to the space between the third and fourth toes, and 

 bifurcates to supply the adjacent sides of these toes and the web 

 between them. 



(3) The third branch at once divides to supply : — 

 (a) The M. transv. metatarsi. 



{p) The MM. lumtiricales of the fourth toe. 



(y) The M. abductor digit. V (ab^), the M. flexor brevis dig. V 

 {F^), and the M. adductor dig. V (ad^) ; it then ends as — 



(Ô) A bifurcating branch forming the B. digit, volar, of the fourth 

 and fifth toes. 



III. ^^'ë. I^ ervus peroneus {N . peroneus communis suj)erior,YiQkex), 

 (Fig. 130^5^) is the second division of the sciatic nerve; it passes 

 between the outer head of origin of the 31. gastrocneinii/s and the 

 tendon of insertion of the 31. biceps, it then lies on the tibio-fibula 

 between the 31. gastrocnemius and the 31. peroneus, where it is ac- 

 companied by the Vena tibialis postica, then runs downwards upon 

 the 31. extensor cruris and the Flexor tarsi ant., and passes under 

 the 31. tibial, anticns and bifurcates ; its branches are : — 



o 2 



