Muscles of the anterior compartment of the leg

Question 1

What are the 4 muscles of the anterior compartment of the leg?

Answer 1

• Tibialis anterior
• Extensor digitorum longus
• Extensor hallucis longus
• Peroneus (fibularis) tertius

Question 2

Where does the arterial blood supply of the anterior compartment of the leg come from?

Answer 2

Anterior tibial artery

Question 3

Tibialis Anterior

Answer 3

O: Lateral surface of tibia

I: Medial cuneiform and base of first metatarsal (after passing extensor retinacula)

I: Deep peroneal (fibular) nerve

A: Dorsiflexion and inversion of foot

Question 4

Extensor Digitorum Longus

Answer 4

O: Lateral condyle of tibia, medial surface of fibula and interosseous membrane

I: 4 tendonds insert into second to fifth toes (middle and distal phalanges) (after passing extensor retinacula)

I: Deep peroneal (fibular) nerve

A: Extension of four toes and assists dorsiflexion

Question 5

Extensor Hallucis Longus

Answer 5

O: Medial surface of fibular shaft

I: Base of distal phalanx of great toe

I: Deep peroneal (fibular) nerve

A: Extension of great toe and assists dorsiflexion

Question 6

Peroneus (Fibularis) Tertius

Answer 6

O: Medial surface of fibula (below origin of EDL)

I: Base of the fifth metatarsal

I: Deep peroneal (fibular) nerve

A: Eversion and assists dorsiflexion