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extensor carpi radialis brevis muscle
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Illustration of the human forearm from an anterior view, showing the superficial layer of muscles, tendons, and ligaments. Major structures including the biceps brachii, brachialis, pronator teres, flexor carpi radialis, and palmaris longus muscles are labeled, along with nerves and arteries such as the median nerve and radial artery. An anatomical illustration of the human forearm and hand from a posterior view, showing labeled muscles and tendons including the triceps brachii, brachioradialis, extensor digitorum, and various extensor and abductor muscles and tendons. Illustration of the human upper arm from a posterior view, showing labeled muscles and nerves including the triceps brachii, deltoid, supraspinatus, infraspinatus, and several forearm extensor muscles.
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extensor carpi radialis brevis muscle

anatomy
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Illustration of the human forearm from an anterior view, showing the superficial layer of muscles, tendons, and ligaments. Major structures including the biceps brachii, brachialis, pronator teres, flexor carpi radialis, and palmaris longus muscles are labeled, along with nerves and arteries such as the median nerve and radial artery.
Muscles of the human forearm The forearm contains flexor and extensor muscles, which help control fine movements of the wrist, hand, and fingers.

The extensor carpi radialis brevis is a muscle in the forearm that helps to extend the wrist. It originates from the lateral epicondylar region of the humerus, a bone in the upper arm. This muscle, along with others, runs along the back of the forearm to the metacarpal bones in the hand.12

Overuse of the extensor carpi radialis brevis muscle can lead to an injury known as tennis elbow. This condition causes pain on the outer side of the elbow and is often associated with repetitive extension of the wrist. While common in tennis players, it can occur from any activity involving repeated wrist extension.2

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3 Britannica Sources
  1. extensor muscle
  2. tennis elbow
  3. flexor muscle

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