Lower limb

Tendons of extensor digitorum longus

Tendines musculi extensoris digitorum longi

Origin

Continuation of the muscle belly of extensor digitorum longus, which arises from the lateral tibial condyle and the anterior surface of the fibula

Insertion

Middle phalanx and distal phalanx of the second to fifth toes, via the extensor expansion

Function

Extension of toes 2-5 at the MTP and IP joints, and supports dorsiflexion of the ankle

Innervation

Deep fibular (peroneal) nerve, L5-S1

Movement & chain

Connect the muscle belly to the dorsal digital expansions of toes II–V; synergist with tibialis anterior in ankle dorsiflexion.

Palpation

The four tendons are clearly visible and can be followed across the dorsum of the foot during active toe extension.

Clinical

In lacerations of the dorsum of the foot, these tendons, together with the deep fibular nerve and the dorsalis pedis artery, are at increased risk of being cut; after injury to the extensor retinaculum, the tendons can 'bowstring'.

Segmental innervation

L5–S1 (deep fibular nerve)

In clinical practice

Frequent repositioning to prevent trochanteric and heel pressure ulcers; ensure hip dislocation precautions in total hip arthroplasty patients.

Region in the model

Lower limb