R.GASTROCNEM. 



R, AD SOLEUM 



R. AD POPLIT 



M.tibiaL. post. 



M, flex, 

 comm. lone;. 



N. TIBIALIS POST. 

 N. PERONEUS 



N.SURALI5 

 S.SAPHEN.EXT. 



M. flexor 



halluc. long, 



162 Spinal Nerves. 



The great sciatic nerve 

 divides at a varying point into 

 two branches, which, in the pop- 

 liteal space are known as the 

 external and internal 

 popliteal^ further down are 

 called the peroneal and 

 posterior tibial nerves. 

 1. The external pop- 

 liteal or peroneal nerve 

 descends to the fibula, and sends 

 off articular branches to 

 the knee-joint and cuta- 

 neous branches, the N. cuta- 

 'iicus surae externus et medius to 

 the skin. It then divides into 

 two branches, a superficial, 

 the m u s c u 1 o - c u t a n e o u s, 

 and a deep, the anterior 

 t i b i a 1, 



a) The musculo- cuta- 

 neous branch, (N, peroneus 

 superficialis) passes forwards be- 

 tween the MM.perond and exten- 

 sor loncjus digitorum, pierces the 

 deep fascia and is finally divided 

 into an external branch, 

 N. cutaneus pedis dorsalis medius, 

 communicating with the short 

 saphenous nerve, and an inter- 

 nal, JN 7 . cutaneus pedls dorsalis 

 interims, communicating with 

 the great saphenous nerve. 

 They form the seven dor- 

 sal nerves of the toes 

 (Fig. 507). 



b) The anterior tibial 

 branch (N. peroneus profundus) 

 passes forwards to the fore 



part of the interosseous membrane, and gives off muscular branches for 

 the MM. tlbialis anticus, extensor lonyus digitorum, peroneus tertius and 



Ten Jo 

 AchilHs 



506. The Posterior Tibial 

 Nerve. 



