Muscles of the Lower Leg : Anterior Compartment

Question 1

Tibialis Anterior

Answer 1

O : Lateral condyle of the tibia, proximal 2/3 of anterior tibia and proximal 2/3 of the interosseous membrane
I : Medial cuneiform and base of 1st metatarsal
A : Dorsiflex the foot at the ankle joint

Question 2

Extensor Hallucis Longus

Answer 2

O :Middle 1/3 of anterior fibula, middle 1/3 of interosseous membrane
I : Dorsal surface of the distal phalanx of the first toe
A :
1. Extend the first toe at metatarsophalangeal and interphalangeal joint
2. Dorsiflex the foot at the ankle joint

Question 3

Extensor Digitorum Longus

Answer 3

O : Lateral condyle of the tibia, proximal 2/3 of fibula and proximal 1/3 of interosseous membrane
I : Dorsal surface of toes 2-5 via its dorsal digital expansion onto the dorsal surface of the middle and distal phalanges
A :
1. Extends toes 2-5 at the metatarsophalangeal and interphalangeal
2. Dorsiflex the foot at the ankle joint

Question 4

Fibularis Tertius

Answer 4

O : Distal 1/3 of the anterior fibula and distal 1/3 of interosseous membrane
I : Dorsal surface of the base of the 5th metatarsal
A : Dorsiflex the foot at the ankle joint