Extensor carpi radialis brevis

The extensor carpi radialis brevis (Latin: musculus extensor carpi radialis brevis) is a slim and long superficial muscle of the forearm that stretches between the humerus and the third metacarpal bone. It belongs to the lateral compartment of the forearm muscles. The extensor carpi radialis brevis is the deepest muscle of the lateral forearm compartment, and it lies inferior to the extensor carpi radialis longus muscle.

Extensor carpi radialis brevis, Arm extensors, Arm muscles, Forearm muscles, Muscles of forearm, Extensors of forearm, Lateral compartment muscles, Lateral compartment of forearm, Muscles of upper limb, Human muscles
Extensor carpi radialis brevis by Anatomy Next
Extensor carpi radialis brevis
OriginLateral epicondyle of humerus
Insertion Base of 3rd metacarpal bone
Action Extension and abduction of hand
InnervationRadial nerve (C7, C8)
Blood supply Radial recurrent, radial collateral and radial arteries

Origin

The extensor carpi radialis brevis muscle originates from the lateral epicondyle of the humerus.

Extensor carpi radialis brevis, Origin of extensor carpi radialis brevis, Insertion of extensor carpi radialis brevis, Forearm muscles, Muscles of the forearm, Arm muscles, Muscles of upper limb, Lateral compartment muscles, Lateral compartment of forearm muscles, Human muscles
Origin and insertion of extensor carpi radialis brevis by Anatomy Next

Insertion

The extensor carpi radialis brevis descends and inserts on the base of the third metacarpal bone.

Action

The extensor carpi radialis brevis muscle together with the extensor carpi radialis longus provides the extension and abduction of the hand at the wrist joint.

Extensor carpi radialis brevis, Action of extensor carpi radialis brevis, Function of extensor carpi radialis brevis, Arm extensors, Arm muscles, Forearm muscles, Muscles of forearm, Extensors of forearm, Lateral compartment muscles, Lateral compartment of forearm, Muscles of upper limb, Human muscles, Human hand, Hand muscles
Action of extensor carpi radialis brevis by Anatomy Next

Innervation

The extensor carpi radialis brevis is innervated by the radial nerve (C7, C8) - a branch of the brachial plexus.

Blood supply

The extensor carpi radialis brevis muscle receives arterial blood supply from the radial recurrent, radial and radial collateral arteries. The radial recurrent artery arises from the radial artery, while the radial collateral artery is a branch of the deep brachial artery.