- Skeletal system
- Head muscles
- Neck muscles
- Muscles of upper limb
- Muscles of pectoral girdle
- Muscles of shoulder region
- Muscles of upper arm
- Muscles of forearm
- Anterior compartment
- Lateral compartment
- Posterior compartment
- Muscles of hand
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- Muscles of lower limb
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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|
|Origin||Lateral epicondyle of humerus|
|Insertion||Base of 3rd metacarpal bone|
|Action||Extension and abduction of hand|
|Innervation||Radial nerve (C7, C8)|
|Blood supply||Radial recurrent, radial collateral and radial arteries|
The extensor carpi radialis brevis muscle originates from the lateral epicondyle of the humerus.
The extensor carpi radialis brevis descends and inserts on the base of the third metacarpal bone.
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.
The extensor carpi radialis brevis is innervated by the radial nerve (C7, C8) - a branch of the brachial plexus.
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.