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Extensor digiti minimi

The extensor digiti minimi (Latin: musculus extensor digiti minimi) is a slender, long superficial muscle of the forearm that extends between the humerus and fifth finger. It belongs to the posterior compartment of the forearm muscles and lies in the first or superficial layer. As the name suggests, this muscle extends the fifth finger.

Extensor digiti minimi
OriginLateral epicondyle of humerus
InsertionBases of middle and distal phalanges of 5th finger
Action Extension of 5th finger
InnervationPosterior interosseous nerve of radial nerve (C7, C8)
Blood supply Anterior and posterior interosseous arteries, radial recurrent artery
Forearm muscles (colored), Upper extremity, Muscles, Human arm, Anteromedial view, Dorsolateral view
Muscles of forearm by
Extensor digiti minimi, Forearm muscles, Muscles of forearm, Posterior compartment of forearm muscles, Posterior compartment muscles, Human muscle, Arm muscles, Extensors
Extensor digiti minimi by



The extensor digiti minimi muscle originates from the lateral epicondyle of the humerus.



The extensor digiti minimi inserts on the bases of the middle and distal phalanges of the fifth finger.



The extensor digiti minimi muscle provides the extension of the fifth finger at the fifth metacarpophalangeal and interphalangeal joints.



The extensor digiti minimi is innervated by the posterior interosseous branch of the radial nerve (C7, C8). The radial nerve arises from the brachial plexus.


Blood supply

The extensor digiti minimi muscle receives arterial blood supply from the posterior and anterior interosseous arteries and radial recurrent artery. The first two arteries are branches of the common interosseous artery, while the radial recurrent artery arises from the radial artery.