Ankle Anterior Compartment

Question 1

What are the muscles in the anterior compartment

Answer 1

Tibialis anterior
Extensor digitorum Longus
Extensor hallucis Longus
Peroneus tertius

Question 2

What is the origin, insertion and action for tibialis anterior

Answer 2

Origin - upper 1/2 to 2/3 lateral surface of tibia and adjacent Interosseous membrane
Insertion - medial surface of medial cuneiform and base of 1st MT
- blends with peroneus Longus
Action - dorsiflexion of ankle and inversion of foot

Question 3

What is the origin, insertion and action for extensor digitorum Longus

Answer 3

Origin - upper 2/3 anterior surface of fibula
- upper part of Interosseous membrane
- lateral tibial condyle
Insertion - extensor hood (dorsal digital expansion), base of middle and distal phalanges of toes 2-5
Action - extension of lateral 4 toes at MTP jts
- extension of IP jts
- assists dorsiflexion of ankle

Question 4

What is the origin, insertion and action for extensor hallucis Longus

Answer 4

Origin - middle 1/2 of anterior surface of fibula and adjacent Interosseous membrane
Insertion - dorsal surface, base of distal phalanx of great toe
- slips to base of proximal phalanx & 1st MT
Action - extends all joints of great toe, mainly MTP joint
- powerful dorsiflexor

Question 5

What is the origin, insertion and action for peroneus tertius

Answer 5

Origin (part of EDL) - lower 1/4 of medial fibula and adjacent Interosseous membrane
Insertion - base of 5th MT, medial and dorsal aspect
Action - weak dorsiflexor of foot (with EDL)
- weak Evertor of footy