Deltoid Muscle Biceps Brachii Brachioradialis Muscle Palmaris Longus Muscle Extensor Carpi Radialis Longus Muscle Extensor RetinaculumDorsal Interossei Muscle Extensor Carpi Ulnaris Muscle Extensor Digitorum Communis Muscle Extensor Carpi Radialis Brevis Muscle Triceps Brachii Muscle Biceps Brachii Muscle Posterior Brachialis Muscle
Extensor Digitorum Communis Muscle
Extensor Digitorum Communis is a long muscle with one origin and multiple insertions.
Extensor Digitorum Communis has following origin and insertions:
Origin : It arises from the Lateral Epicondyle of the Humerus via a common extensor tendon.
It runs downwards and divides into four parts.
Insertion : Extensor Digitorum Communis gets inserted into the Extensor Expansion and via it to the posterior surface of the medial four Phalanges.
The tendon of this muscle divides several times, at different levels (at the level of metacarpophalangeal joint and interphalangeal joint) before it can insert into its final destination. Result is the formation of a net like structure on the back of hand. That’s why this muscle is given the name of extensor expansion.
It is supplied in most part by Posterior Interosseous Artery.
Extensor Digitorum Communis is innervated via Radial Nerve.
Contraction of Extensor Digitorum Communis causes extension of the Wrist joint and all 4 medial Phalanges.
Any isolated damage or injury to this muscle is quite rate. However, a rare condition associated with extensor digitorum is called isolated compartment syndrome. This condition is characterized by excessive swelling, pain and poor perfusion of tissues. The swelling is enhanced to such degree that it starts to hamper the supply of blood to tissues causing tissue death.