Muscles of the Lateral Leg/Anterior Leg

Question 1

Peroneus Longus

Answer 1

O: head and lateral surface of fibula

I: base of first metatarsal bone and medial cuneiform

A: eversion of foot; weak plantarflexion; supports transverse and medial/lateral longitudinal arches

N: superficial fibular (peroneal n.) (L5, S1, S2)

Question 2

Peroneus Brevis

Answer 2

O: lateral surface of fibula; inferior 2/3

I: dorsal tuberosity on lat. side of base of fifth metatarsal

A: eversion of foot; weakly plantarflexes

N: superficial fibular nerve (L5, S1, S2)

Question 3

Tibialis Anterior

Answer 3

O: lateral condyle and superior 1/2 of lateral tibia

I: med. and inf. surfaces of medial cuneiform and 1st metatarsal

A: dorsiflexion; inverts foot; supports med. longitudinal arch

N: deep fibular n. (L4, L5)

Question 4

Extensor Digitorum Longus

Answer 4

O: lat. condyle of tibia, ant surface of fibula, interosseous membrane

I: middle and distal phalanges of lateral 4 digits

A: Extension of lateral 4 digits and dorsiflexion of foot

N: Deep fibular n. (L4, L5)

Question 5

Extensor Hallucis Longus

Answer 5

O: middle ant. surface of fibular and interosseous membrane

I: dorsal part of base of the distal phalanx of hallux

A: extends hallux and dorsiflexes foot

N: deep fibular n. (L4, L5)

Question 6

Peroneus Tertius

Answer 6

O: inf ant surface of fibula and interosseous membrane

I: dorsum of base of 5th metatarsal

A: dorsiflexes foot and helps evert

N: deep fibular n. (L4, L5)