420 SPECIAL ANATOMY. 



the dorsum of the foot, and supplies with an internal arched 

 branch the skin of this region, as far as the root of the great 

 toe ; with an external branch the collateral surfaces of the 

 third and fourth toes. 



5. Ramus superjicialis internus s. N. cutaneus dorsi pedis in- 

 tern, supplies the mm. peronei, passes over the ankle joint 

 inwards, towards the internal malleolus, supplies the skin on 

 the internal border of the dorsum pedis and bifurcates. Its 

 internal branch supplies the inner surface of the great, and 

 the collateral surfaces of the same and the second toe ; its 

 external branch the collateral surfaces of the second and third 

 toes. 



y. The deeper terminal or muscular branch. 



6. N. tibialis anticus winds round the capitulum fibula, for- 

 wards, descends on the anterior surface of lig. inteross. out- 

 side and before art. tibialis antica, between m. extensor digi- 

 tor. longus communis, hallucis and tibialis anticus, gives 

 branches to these muscles, passes under lig. cruciatum, upon 

 the dorsum pedis, into the sheath of extensor halluc. and bi- 

 furcates. 



a. Ramus internus, continuation of the trunk, passes under 

 art. metatarsea (pedicea ?) directly forwards, between first 

 and second os metatarsi, unites with the fifth, and supplies, 

 accordingly, the dorsal side of the collateral surfaces of the 

 first and second toes. 



b. Ramus externus passes transversely outwards, close upon 

 the tarsus, under extern, brevis halluc. and digitor. corn- 

 munis, and supplies them. 



b. N. tibialis s. peronceus internus, descends as the continuation 

 of n. ischiadicus, vertically through the popliteal space, between 

 the heads of the gastrocnemius, then on the posterior surface of 

 the tibia, covered by m. soleus, and on the internal border of ten- 

 do Achillis, behind and under the internal malleolus, where it bi- 

 furcates. Situation : in the popliteal space, on the posterior and 

 outer side of vena poplitaa, covered only by the fascia ; as far as 

 tendon Achillis, by mm. gastrocnemius and soleus, on the outer 

 side of art. tibialis postica ; behind and below the malleolus, co- 

 vered by the fascia, in a sheath with the vasa tibialia (and behind 

 them), behind the tendons of m. tibialis posticus and flexor, com- 

 mun. digit longus. 



. Branches : for the posterior part of the knee-joint, for m. popli- 



