Nerves of Leg

Question 1

Origin: Saphenous N.

Answer 1

femoral nerve

Question 2

Course: Saphenous N.

Answer 2

descends w/ femoral vessels through femoral triangle and adductor canal and then descends w/ great saphenous vein

Question 3

Distribution: Saphenous N.

Answer 3

supplies skin on medial side of ankle and foot

Question 4

Origin: Sural N.

Answer 4

usually arises from branches of both tibial and common fibular nerves

Question 5

Course: Sural N.

Answer 5

descends between heads of gastrocenemius and becomes superficial at middle of leg; descends with small saphenous vein and passes inferior to lateral malleolus to lateral side of foot

Question 6

Distribution: Sural N.

Answer 6

supplies skin on posterior and lateral aspects of leg and lateral side of foot

Question 7

Origin: Tibial N.

Answer 7

sciatic nerve

Question 8

Course: Tibial N.

Answer 8

forms as sciatic bifurcates at apex of popliteal fossa; descends through popliteal fossa and lies on popliteus; runs inferiorly on tibialis posterior w/ posterior tibial vessels; terminates beneath flexor retinaculum by dividing into medial and lateral planter nerves

Question 9

Distribution: Tibial N.

Answer 9

supplies posterior muscles of leg and knee joint

Question 10

Origin: Common Fibular (peroneal) N.

Answer 10

sciatic nerve

Question 11

Course: Common Fibular (peroneal) N.

Answer 11

forms as sciatic bifurcates at apex of popliteal fossa and follows medial border of biceps femoris and its tendon; passes over posterior aspect of head of fibula deep to fibularis longus, where it divides into deep and superficial fibular nerves

Question 12

Distribution: Common Fibular (peroneal) N.

Answer 12

supplies skin on lateral part of posterior aspect of leg via the lateral sural cutaneous nerve; also supplies knee joint via its articular branch

Question 13

Origin: Superficial Fibular (peroneal) N.

Answer 13

Common fibular nerve

Question 14

Course: Superficial Fibular (peroneal) N.

Answer 14

arises between fibularis longus and neck of fibula and descends in lateral compartment of leg; pierces deep fascia at distal third of leg to become subcutaneous

Question 15

Distribution: Superficial Fibular (peroneal) N.

Answer 15

supplies fibularis longus and brevis and skin on distal third of anterior surface of leg and dorsum of foot

Question 16

Origin: Deep Fibular (peroneal) N.

Answer 16

common fibular nerve

Question 17

Course: Deep Fibular (peroneal) N.

Answer 17

Arises betwween fibularis longus and neck of fibula; passes through extensor digitorum longus and descends on interosseous membrane; crosses distal end of tibia and enters dorsum of foot

Question 18

Distribution: Deep Fibular (peroneal) N.

Answer 18

supplies anterior muscles of leg, dorsum of foot, and skin of first interdigital cleft; sends articular branches to joints it crosses