What is the extensor pollicis longus?
Extensor pollicis longus (EPL) is a long muscle located at the deep layer with extensor pollicis brevis, abductor pollicis longus, extensor indicis, and supinator muscle in the posterior compartment of the forearm.
What is the function of extensor pollicis longus muscle?
Function. The main action of extensor pollicis longus is extension of the thumb at the metacarpophalangeal and interphalangeal joints. Extension at the metacarpophalangeal joint occurs in synergy with extensor pollicis brevis muscle.
What is the action of extensor pollicis longus and brevis?
Function. Together with extensor pollicis longus, extensor pollicis brevis is in charge of extension of the thumb in the first metacarpophalangeal joint. It also extends the thumb in the carpometacarpal joint of the thumb. This movement is important in the anatomy of the grip, as it enables letting go of an object.
What is the function of extensor pollicis brevis muscle?
Function. In a close relationship to the abductor pollicis longus, the extensor pollicis brevis both extends and abducts the thumb at the carpometacarpal and metacarpophalangeal joints.
Is the abductor pollicis longus and extensor tendon?
The Abductor pollicis longus (APL) is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilization of the thumb. Its tendon is present in the first extensor compartment of the wrist. It lies immediately below the supinator and sometimes unites with it.
What tendon is located in between the abductor pollicis longus and extensor pollicis longus?
EPL tendon. The extensor pollicis brevis (EPB) tendon. The abductor pollicis longus (APL) tendon.
Where is extensor pollicis brevis located?
forearm
The extensor pollicis brevis (EPB) belongs to the deep group of the posterior fascial compartment of the forearm. It is a part of the lateral border of the anatomical snuffbox.
Where does flexor pollicis longus attach?
thumb
Flexor pollicis longus muscle
| Origin | Anterior surface of radius and interosseous membrane |
|---|---|
| Insertion | Palmar surface of distal phalanx of thumb |
| Action | Metacarpophalangeal and interphalangeal joint 1; Thumb flexion |
| Innervation | Median nerve (anterior interosseous nerve C7, C8) |
Is abductor pollicis longus and extensor or flexor?
The Abductor pollicis longus (APL) is one of a deep extensor of the forearm and is responsible for facilitating movement and stabilization of the thumb. Its tendon is present in the first extensor compartment of the wrist.
