966 



NEUROLOGY 



MEDIAL DORSAL CUTA- 

 NEOUS 



SAPHENOUS VEIN 



'HENOUS 

 NERVE 



BRANCH 

 DEEP PERONEAl 



phalangeal joint of the great toe and sends a filament to the first Interosseous 

 dorsalis muscle. 



The Superficial Peroneal Nerve (n. peronceus super ficialis ; musculocutaneous nerve] 

 (Figs. 827, 835) supplies the Peronei longus and brevis and the skin over the greater 

 part of the dorsum of the foot. It passes forward between the Peronsei and the 

 Extensor digitorum longus, pierces the deep fascia at the lower third of the leg, and 



divides into a medial and an inter- 

 mediate dorsal cutaneous nerve. In 

 its course between the muscles, the 

 nerve gives off muscular branches 

 to the Peronsei longus and brevis, 

 and cutaneous filaments to the 

 integument of the lower part of 

 the leg. 



The medial dorsal cutaneous 

 nerve (n. cutaneus dorsalis medial is; 

 internal dorsal cutaneous branch} 

 passes in front of the ankle-joint, 

 and divides into two dorsal digital 

 branches, one of which supplies 

 the medial side of the great toe, 

 the other, the adjacent side of the 

 second and third toes. It also 

 supplies the integument of the 

 medial side of the foot and ankle, 

 and communicates with the saphe- 

 nous nerve, and with the deep 

 peroneal nerve (Fig. 825). 



The intermediate dorsal cuta- 

 neous nerve (n. cutaneus dorsalis 

 intermedius; external dorsal cuta- 

 neous branch}, the smaller, passes 

 along the lateral part of the dor- 

 sum of the foot, and divides into 

 dorsal digital branches, which sup- 

 ply the contiguous sides of the 

 third and fourth, and of the 

 fourth and fifth toes. It also 

 supplies the skin of the lateral 



side of the foot and ankle, and communicates with the sural nerve (Fig. 825). 

 The branches of the superficial peroneal nerve supply the skin of the dorsal 

 surfaces of all the toes excepting the lateral side of the little toe, and the adjoining 

 sides of the great and second toes, the former being supplied by the lateral dorsal 

 cutaneous nerve from the sural nerve, and the latter by the medial branch of the 

 deep peroneal nerve. Frequently some of the lateral branches of the superficial 

 peroneal are absent, and their places are then taken by branches of the sural 

 nerve. 



The Pudendal Plexus (plexus pudendus} (Fig. 828). The pudendal plexus is 

 not sharply marked off from the sacral plexus, and as a consequence some of the 

 branches which spring from it may arise in conjunction with those of the sacral 

 plexus. It lies on the posterior wall of the pelvis, and is usually formed by branches 

 from the anterior divisions of the second and third sacral nerves, the whole of the 

 anterior divisions of the fourth and fifth sacral nerves, and the coccygeal nerve. 



BRANCHES 

 EXTERNAL PLAN 

 TAR NERVE 



BRANCHES OF INTERNAL 

 PLANTAR NERVE 



FIG. 836. Nerves of the dorsum of the foot. (Teetut.) 



