Extensor Digitorum

achilles-insertion-lateral-labeledMuscle Origin

Lateral epicondyle (common extensor tendon) of the humerus to second to fifth phalanges.

It is attached to the superior lateral surface of the calcaneus, also to the lateral calcaneal and the cruciate crural ligament. It arises from the lateral epicondyle of the humerus, by the common tendon; from the intermuscular septa between it and the adjacent muscles, and from the antebrachial fascia.


Extensor expansion of middle and distal phalanges of the 2nd, 3rd, 4th, and 5th fingers.

An extensor expansion (dorsal expansion, dorsal hood, dorsal aponeurosis) is the special connective attachments by which the extensor tendons insert into the phalanges. Wiki


Extends fingers/wrist.

Extension of hand, wrist and fingers: Extends medial four digits at metacarpophalangeal joints; Extends hand at wrist joint

Innervation – Nerve control

Radial nerve.

The radial nerve is a nerve in the human body that supplies the posterior portion of the upper limb. It innervates the medial and lateral heads of the triceps brachii muscle of the arm, as well as all 12 muscles in the posterior osteofascial compartment of the forearm and the associated joints and overlying skin. Wiki


Interosseous recurrent and posterior interosseous arteries.

The posterior interosseous artery (dorsal interosseous artery) is an artery of the forearm. It passes backward between the oblique cord and the upper border of the interosseous membrane. It appears between the contiguous borders of the supinator and the abductor pollicis longus, and runs down the back of the forearm between the superficial and deep layers of muscles, to both of which it distributes branches. Wiki

Antagonist muscles

Flexor digitorum superficialis muscle, Flexor digitorum profundus muscle.

Pictures of muscles


Trigger Point Referrals


Stretching description








Additional Resources
American Academy of Manual Medicine
University of Washington, Department of Radiology

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