196 



THE NERVOUS SYSTEM. 



a. The N. cuianeus cruris lateralis (Fig-. 128 cj)) ; which, Hke other 

 cutaneous nerves, runs in a common sheath tog-ether with an artery 

 and vein to the skin. It arises close to the sciatic nerve. 



b. Muscular branches to the MM. peroneus, tibialis antiais, extensor 

 crvris h revis, and the -flexor tarsi anterior. 



Fig. 130. 



Distribution of the JV. peroneus. 



A Inner terminal twig of N. peron. conini. 



inf. 

 li Outer terminal twig of N. peron. conini. 



inf. 

 cpl N. cutaneus dorsi jjedis lateralis. 

 pc N. peroneus. 



pci N. peroneus communis inferior 

 pi N. peroneus lateralis. 

 pin X. pei'oneus medialis. 



c. The N. peroneus medialis (Fig". 

 130 pvi) is the smaller of the two 

 terminal branches of the N. pero- 

 neus ; it courses with the Art. titii- 

 alis antica under the MM. jlexores 

 tarsi anterior and pjosterior and sup- 

 plies the latter. 



d. The N. peroneals lateralis (Fig. 

 T 30 jd) is the larger terminal branch 

 of the N. pjeroneus ; it passes down- 

 wards between the heads of the M. 

 tihialis anticus to the tendon of origin 

 of the Flexor tarsi posterior, where it 

 gives off two branches (Nos. i and 2) ; 

 the nerve then unites with the i\". 

 peroneus lateralis to form a common 

 stem, the N. peroneus comnivnis in- 

 ferior (Ecker). The N. peroneus 

 lateralis g-ives off : — 



(i) The N. cntaneus dorai pedis 

 lateralis (cpl), which passes to the 

 skin of the outer side of the 

 dorsum of the foot. 



(2) A second branch to the M. ex- 

 tensor of the fourth and fifth toes. 



e. The N'. pjeroneus communis in- 

 ferior (Fig". 130 p^<^^) runs on the 

 dorsum of the foot in company with 

 the Art. dorsalis pj^dis, underneath 

 the MM. extensores digiti 1 and // ; 

 it supplies several branches and then 

 bifurcates. It g"ives off : — 



(i) Branches to the MM. extensor 

 longns and fjrevis digiti I. 



