THE NERVOUS SYSTEM. 



225 



FIG. 102 VENTRAL ASPECT OF THE NERVES OF HIND-LIMB. 

 4, 5, 6, 7, 1, 2, and 3, Fourth, fifth, sixth, and seventh lumbar, and first, 

 second, and third sacral nerves ; a, branch from the fourth to the fifth ; 

 ac, anterior crural; cu, saphenous; d, anterior tibial; e, peroneal or 

 musculocutaneous ; ex, external popliteal or peroneal; ef, external 

 plantar; fo, obturator foramen; gs, greater sciatic; g, external sper- 

 matic ; it, internal popliteal ; ip, internal plantar ; kn, knee ; /, external 

 cutaneous; Is, lumbosacral cord; t, posterior tibial; s, small sciatic. 



19 



