Lower Extremity (leg) innervation and action

Question 1

Gastrocnemius

Answer 1

Innervation: S1 - S2
Tibial nerve
Action: Plantarflexes foot and flexes knee

Question 2

Soleus

Answer 2

Innervation: S1-S2
Tibial nerve
Action: Plantarflexes foot

Question 3

Anterior tibialis

Answer 3

Innervation:  L4-L5
                      Deep fibular nerve
Action:  Dorsiflexion
              Inversion
              Dynamic support of medial arch of foot

Question 4

Extensor digitorum longus

Answer 4

Innervation: L5-S1
Deep fibular nerve
Action: Dorsiflexion
Extension of lateral 4 toes

Question 5

Fibularis longus

Answer 5

Innervation: L5-S1-S2
                     Superficial fibular nerve
Action:  Eversion
              Plantarflexion
              Supports arches of foot

Question 6

Fibularis brevis

Answer 6

Innervation: L5-S1-S2
Superior fibular nerve
Action: Eversion

Question 7

Fibularis (peroneas) tertius

Answer 7

Innervation: L5-S1
Deep fibular nerve
Action: Dorsiflexion
Eversion