What is the function of extensor pollicis brevis muscle?
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 action of the extensor pollicis longus?
The main action of extensor pollicis longus is extension of the thumb at the metacarpophalangeal and interphalangeal joints. When the thumb reaches the full extension or abduction, extensor pollicis longus can also assist in adduction of the thumb.
What is the action of extensor Indicis?
Function. The primary function of Extensor Indicis Propius is the extension of second digit at metacarpophalangeal and interphalangeal joints. It may assist in wrist extension. It assists in abducting the index finger.
What does the abductor pollicis brevis do?
Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb. The abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb.
Which of the following is the primary function of the extensor pollicis longus muscle select one?
Function. The EPL mainly hyper-/extends the interphalangeal joint of the distal phalanx of the thumb. It also serves as accessory extensors and adductors of the metacarpophalangeal of the proximal phalanx and carpometacarpal joints of the first metacarpal. It may also assist in wrist joint extension.
What is an antagonist to the extensor pollicis longus and brevis muscles?
| Extensor pollicis longus muscle | |
|---|---|
| Nerve | posterior interosseous nerve (branching from the radial nerve) |
| Actions | extension of the thumb (metacarpophalangeal and interphalangeal) |
| Antagonist | Flexor pollicis longus muscle, Flexor pollicis brevis muscle |
| Identifiers |
Why does my abductor pollicis brevis hurt?
De Quervain’s Tenosynovitis is a painful condition which affects the thumb muscles (Abductor Pollicis Longus and extensor Pollicis Brevis). Commonly seen in females who are in the post-natal phase, it is caused by a rapid increase in load on the thumb muscles and tendons.
How do you test for the function of the abductor pollicis brevis?
The abductor pollicis brevis pulls the thumb away from the palm at a right angle. One way to test this is to lie the forearm on a table, palm up and ask the patient to point their thumb towards the ceiling. At the same time, you can push down on the thumb to give some resistance.
What is the function of the extensor pollicis brevis?
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.
Which is part of the abductor pollicis longus muscle?
Absence; fusion of tendon with that of the extensor pollicis longus or abductor pollicis longus muscle. 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.
What causes rupture of extensor pollicis longus tendon?
Inflammation or a rupture of extensor pollicis longus tendon is commonly referred to as “drummer’s paralysis”. This condition is most commonly caused by blunt mechanical injuries to the wrist area or a simple overuse of the extensor pollicis longus muscle.
Which is the deep extensor of the thumb?
Extensor pollicis brevis is a deep extensor of the thumb that lies deep to extensor digitorum muscle. It sits directly medial to abductor pollicis longus and posterolateral to extensor pollicis longus muscle.