DISSECTION OF THE LOWER EXTREMITY 165 



(a) Common peroneal nerve (N. peronaeus communis) (0. T. external 

 popliteal nerve). 



(oa) Superficial peroneal nerve (N. peronaeus superficialis) (0. 

 T. musculocutaneous nerve). 



(ab) Deep peroneal nerve (N. peronaeus profundus) (0. T. ante- 

 rior tibial nerve). 



What muscles are supplied by the superficial peroneal nerve? 

 What cutaneous area? Review at this stage of the dissection the 

 distribution of the deep peroneal nerve. What are the homo- 

 logues of these nerves in the forearm? 



MEDIAL REGION OF LEG (REGIO CRURIS ME- 

 DIALIS) (0. T. TIBIAL REGION). 



The student has but little to examine here, as the tibia is sub- 

 cutaneous. Study 



(a) Tendons of insertion of Mm. sartorius, gracilis, and semitendinosus. 



(b) Great saphenous vein (V. saphena magna) (0. T. internal saphenous 



vein ) . 



(c) Branches of saphenous nerve (N. saphenus) (0. T. internal saphe- 



nous nerve). 



(ca) Infrapatellar branch (ramus infrapatellaris) . 



(cb) Medial cutaneous rami of leg (rami cutanei cruris mediales) . 



(d) Medial inferior artery of knee (A. genu inferior medialis) (0. T. 



inferior internal articular artery). 



(e) Tibial collateral ligament of knee-joint (Lig. collateral tibiale) (0. 



T. internal lateral ligament). 



POSTERIOR REGION OF LEG AND HEEL (REGIO 



CRURIS POSTERIOR ET REGIO CALCANEA) 



(0. T. POSTERIOR TIBIOFIBULAR REGION). 



Note how the leg tapers from above downward. The large, 

 convex, fleshy upper half is known as the calf (sura). The lower 

 half rapidly diminishes in size, so that the tibia and fibula may 

 be felt as they pass into their respective malleoli. Behind each 

 malleolus will be found a fossa. Flex the foot and extend it and 

 note the play of tendons in each fossa. These fossae become 

 obliterated in pathological processes involving the synovial mem- 

 brane of the ankle-joint. Outline the stronger tendon (tendo 

 calcaneus [Achillis] ) passing down to the os calcaneum. 



Superficial- Fascia of Leg. 



Make the muscles of the calf tense and continue the medial 



