DISTRIBUTION Ol< THE CUTANEOUS \KKVKX 



II! (7 



through the posterior femoral cutaneous (small sciatic) nerve, and the lower middle 

 area by the first and second sacral nerves through the sural (external saphenous) 

 nerve. The outer area is supplied by the fifth lumbar and the first and second sacral 

 nerves lhrou'_di the lateral sural cutaneous (fibular coiiimunicatiii"') of the common 

 peroneal (external popliteal) nerve (fin'. 710). 



The skin of the dorsum of the foot, is supplied principally by the fourth and 

 fifth lumbar and by the first sacral nerves; the majority of the nerve-fibres 

 travel by the superficial peroneal (musculo-cutaneous) nerve, but the adjacent sides 

 of the first and second toes are supplied by the femoral (anterior crural) nerve and 

 the outer side of the dorsum of the little toe is supplied by the first and second 

 sacral nerves through the sural (external saphenous) (fig. 71(1). 



The skin of the region of the heel is supplied by the first and second sacral in 

 the inner surface and inner part of the under surface by the medial calcaneal 

 branches of the tibial (calcaneo-plantar) nerve and the posterior, external, and lower 

 aspects by the sural 'external saphenous) nerve (fig. 710). 



Fio. 714. DIAGRAM OF THE CUTANEOUS AREAS OF THE LOWER EXTREMITY. 



(After Thorburn.) 



The sole of the foot in front of the heel receives cutaneous fibres from the 

 last two lumbar and the first two sacral nerves; the inner area, which includes the 

 inner three and a half digits, being supplied by the medial plantar nerve which 

 conveys fibres of the fourth and fifth lumbar and the first sacral nerves: and the 

 outer area by the first and >econd sacral nerves through the lateral plantar nerve. 



The inner side of the foot is supplied by the third and fourth lumbar nerves 

 through the saphenous nerve and the outer side by the first and second sacral nerves 

 through the sural (external saphenous) nerve (fig. 710). 



The skin of the scrotum a-nd penis is supplied by the first lumbar nerve through 

 the ilio-inguinal nerves, and the second and third sacral nerves through the perineal 

 and dorsal penile branches of the pudendal (pudic) nerve (fig. 710). 



The cutaneous areas of the lower extremity which have been demarcated by 

 Head and Thorburn are shown in figs. 7K and 714. 



