extensor pollicis longus muscle

Extensor pollicis longus (EPL) muscle is a muscle of the deep compartment in the posterior compartment of the forearm. It passes through the 3extensor compartment of the wrist, then continues laterally towards the thumb around Lister's tubercle. The tendon of EPL defines the ulnar border of the anatomical snuff box. It is one of the extrinsic muscles of the hand.

Summary

• origin: posterior surface of the middle 1/3 of the ulna and interosseous membrane
• insertion: posterior surface of the base of the distal phalanx of thumb
• innervation: posterior interosseous nerve (C7 and C8), a continuation of the deep branch of the radial nerve (C7, C8)
• arterial supply: anterior and posterior interosseous arteries
• action: extends the thumb at the carpometacarpal and interphalangeal joints, and partially adducts 1 metacarpal

Related pathology

• distal intersection syndrome
• EPL tenosynovitis, common after activities such as drum playing

Siehe auch:

• Fingermuskulatur
• Extensoren des Unterarmes
• Ruptur des Musculus extensor pollicis longus
• Musculus extensor pollicis et indicis communis

und weiter:

• Extensoren
• extensor pollicis longus tendon tear