Lateral epicondyle of humerus

Muscles attaching or palpated here

• Anconeus — Small triangular muscle at the back of the elbow that helps the triceps straighten the elbow and steadies the joint.
• Brachialis — Broad muscle under the biceps that is the strongest flexor of the elbow in any forearm position.
• Brachioradialis — Long, superficial muscle on the thumb side of the forearm that flexes the elbow, most strongly with the thumb pointing up.
• Extensor carpi radialis brevis — Wrist extensor lying just under its longer partner, running from the lateral epicondyle to the middle finger metacarpal and lifting the back of the hand.
• Extensor carpi radialis longus — Outer forearm muscle running from above the lateral epicondyle to the index finger metacarpal, extending the wrist and tilting it towards the thumb.
• Extensor carpi ulnaris — Long muscle on the back of the forearm next to the ulna that extends the wrist and tilts it towards the little finger.
• Extensor digitorum — Muscle in the middle of the back of the forearm whose four tendons straighten the fingers and help extend the wrist.
• Supinator — Deep, curved muscle that wraps around the top of the radius and turns the palm up (supination) in any elbow position.
• Wrist extensors — Group of muscles on the back of the forearm, mostly arising from the common extensor tendon at the lateral epicondyle, that straighten and lift the wrist and fingers.