176 



DISSECTION OF THE LEG. 



clean the 

 fascia. 



Cutaneous 

 veins : 



internal 

 saphenous ; 



external 

 saphenous. 



Source of 

 the cutane- 

 ous nerves. 



Musculo- 

 cutaneous 

 supplies 

 most of the 

 toes; 



divides into 

 inner and 



lies the external saphenous nerve ; and about the middle of the 

 instep the internal saphenous nerve ceases. In the interval between 

 the great and second toes the cutaneous 

 part of the anterior tibial nerve appears. 



The digital nerves should be traced to 

 the ends of the toes by removing the 

 integuments ; and after the several vessels 

 and nerves are dissected, the fat is to be 

 taken away, in order that the fascia may 

 be seen. 



The VENOUS ARCH on the dorsum of 

 the foot has its convexity turned forwards, 

 and receives digital branches from the 

 toes ; at its concavity it is joined by 

 small veins from the instep. Internally 

 and externally it passes into the saphenous 

 veins. 



The INTERNAL SAPHENOUS VEIN begins 

 at the inner side of the great toe, and 

 in the arch. It ascends in front of the 

 inner malleolus along the inner side of the 

 tibia into the thigh. Branches enter it 

 from the inner border and sole of the 

 foot. 



The EXTERNAL SAPHENOUS VEIN begins 

 on the outside of the little toe and foot, 

 as well as in the venous arch ; and it is 

 continued below the outer ankle to the 

 back of the leg (p. 187). 



CUTANEOUS NERVES (fig. 66). The 

 superficial nerves on the front of the leg 

 and foot are derived mainly from the 

 musculo - cutaneous and anterior tibial 

 branches of the external popliteal trunk, 

 and from the external saphenous nerve 

 from the two popliteals. Some incon- 

 siderable offsets ramify on the front of the 

 leg from the internal saphenous and 

 external popliteal. 



The MUSCULO-CUTANEOUS NERVE ( 2 ) ends 



on the dorsum of the foot and toes. 

 Perforating the fascia in the lower third 

 of the leg with a cutaneous artery, it 

 divides into two principal branches 



(inner and outer), which give dorsal digital nerves to the sides of 

 all the toes, except the outer part of the little toe and the contiguous 

 sides of the great toe and the next. The branches may be traced 

 in the integument as far as the end of the last phalanx : 



The inner branch ( 3 ) sends one offset to the inner side of the 

 foot and great toe, and another to the adjacent sides of the second 



FIG. 66. CUTANEOUS 

 NERVES OF THE FRONT 



OF THE LEG AND FoOT. 



1. Anterior tibial. 



2. Musculo - cutaneous, 

 with 3, its inner, and 4, 

 its outer branch. 



5. Internal saphenous. 



6. Offsets of external 

 popliteal, lateral cuta- 

 neous. 



