TIBIAL NEEVE. 



733 



their union the nervus suralis results, which reaches the foot, winding round 

 the back of the lateral malleolus, along with the small saphenous vein. - The 

 nervus surah's supplies cutaneous branches to the lateral side and back of the 

 distal third of the leg, the ankle and heel, and the side of the foot and little toe, 

 as well as articular branches to the ankle and tarsal joints. 



ILIO-HYPOGASTRIC 



- /POSTERIOR CUTANEOUS N. 

 THE THIGH 



[LATERAL CUTANEOUS N. 

 I OF THE THIGH 



S.1.23 



S.l.2.3 



MEDIAL CUTANEOUS 



SAPHENOUS N. 



S12.3 



f LATERAL CUTANEOUS N. 



\Qf THE LEG 



-SUPERFICIAL PERONEAL N. 



..4.S.S.I ' 



134 



-H SUHAL N 



CALCANEAN N. 1 



MEDIAL PLANTAR N. 1 



\ LATERAL PLANTAR N. 



LAS 



A B 



FIG. 629. DISTRIBUTION OF CUTANEOUS NERVES ON THE BACK OF THE LOWER LIMB. 

 In A the distribution of the several nerves is represented, their names being given. 



a schematic representation is given of the areas supplied by the above nerves, the figures indicating 

 the spinal origin of the branches of distribution to each centre. 



nervus suralis communicates on the foot with the superficial peroneal nerve, and its 

 size varies with the size of that nerve. It may extend on to the dorsum of the foot for 

 a considerable distance, and may either reinforce or replace the branches of the above- 

 named nerve to the intervals between the fourth and fifth and the third and fourth 

 toes. The mode of formation of the nervus suralis is very variable. The usual arrange- 

 ment is that described. Frequently the peroneal anastomotic nerve and the medial sural 

 nerve (medial cutaneous nerve of the leg) do not unite, and in such cases the more usual 

 arrangement is for the tibial trunk alone to form the nervus suralis (nerve of the calf), 



