AnatomyDeck

Muscle

Extensor digitorum longus

Extends the lateral four toes

Lower limbMuscular system

High-yield

Extends toes 2–5 and dorsiflexes the ankle; deep fibular nerve.

Overview

An anterior leg muscle extending the toes and dorsiflexing the ankle, forming dorsal digital expansions.

Reference facts

  • Origin

    Lateral condyle of the tibia, proximal fibula, and interosseous membrane

  • Insertion

    Middle and distal phalanges of the lateral four toes (via extensor expansions)

  • Action

    Extends the lateral four toes and dorsiflexes the ankle

  • Innervation

    Deep fibular (peroneal) nerve (L5, S1)

  • Blood supply

    Anterior tibial artery

Your notes