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Extensor carpi radialis longus

Other Terms: Musculus extensor carpi radialis longus, Muscle long extenseur radial du carpe

Muscle parts

None

Latin name

Musculus extensor carpi radialis longus

Latin muscle parts

None

Group

Antebrachial muscle – posterior compartment – lateral group

Etymology

In English this muscle’s name is the long muscle on the radial side that straightens the wrist. The word extensor comes from the Latin ex meaning “out from” and tendere meaning “to stretch.” Carpi is the genitive form of the Latin carpus meaning “wrist.” Radialis is used in reference to the muscle’s position on the radial side of the forearm. This term comes from the Latin radius meaning “a rod or spoke,” which is the shape of the bone. The term longus is Latin for “long” and is typically used when there is a similar muscle that has the same name but is shorter.

Origin

Distal part of lateral supracondylar ridge of the humerus and lateral epicondyle via the common extensor tendon

Insertion

Posterior surface at the base of 2nd metacarpal bone

Action

Extension of the wrist; abducts (radial deviation) the wrist

Nerve supply

Radial nerve (C6 and C7)

Blood supply

From proximal to distal, the muscle receives blood from the radial collateral artery, the radial recurrent artery, the recurrent interosseous artery, and the posterior interosseous artery.

Latin

Musculus extensor carpi radialis longus

French

Muscle long extenseur radial du carpe

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