Extensor digitorum longus

Original Editor - Ahmed Nasr Top Contributors - Ahmed Nasr and Kim Jackson

Origin

Extensor digitorum longus1.png

Most of extensor digitorum longus  arises from the anterior surface of the medial surface of the fibula and the upper part of anterior surface of the interosseus membrane, while a small part arises from the lateral tibial condyle.[1]

Insertion

It divides into  four slips that insert into the proximal and distal phalanges of the lateral four digits of the foot. [1][2]

Nerve Supply

Deep peroneal nerve, a branch of the common peroneal nerve.(L4, L5)[1]

Action

Extends lateral four digits and dorsiflexes the ankle.

Extensor digitorium longus tends to be overactive and tight for an inhibited Tibialis anterior, so stretching and myofascial release of the muscle together with activation tibialis anterior is indicated to regain muscle balance.

  1. 1.0 1.1 1.2 Keith L. , Anne M. R . Clinically Oriented Anatomy . philidephia : Lippincott Williams & Wilkins.Feb 13, 2013
  2. Anatomy next. Extensor digitorium longus. Available from:https://www.anatomynext.com/extensor-digitorum-longus/ (24july 2019)