How do you test the APB muscle?
The function can be tested by providing resistance to abduction up and away from the plane of the palm.
What is EPB muscle?
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.
What Innervates APB?
Innervation. The abductor pollicis longus muscle is innervated by the posterior interosseous nerve, which is a continuation of the deep branch of the radial nerve after it passes through the supinator muscle. Abductor pollicis longus lies close to the radial nerve.
How does abductor pollicis brevis work?
The abductor pollicis brevis acts to abduct the thumb by way of the metacarpophalangeal joint and the carpometacarpal joint, in addition to providing some assistance in the opposition and extension of the thumb.
Where is the EPB tendon located?
As mentioned previously, the EPB tendon is classically described as inserting into the dorsum of the base of the proximal phalanx of the thumb.
Why does the EPB of my thumb hurt?
This condition consists of a tenosynovitis of the first dorsal compartment. Within this compartment at the wrist is contained the extensor pollicis brevis (EPB) and abductor pollicis longus (APL) tendons. It is manifested by pain at the base of the thumb that migrates up the wrist and forearm.
Where does the APB insert?
Origin and insertion After originating from these locations, the muscle fibers form a single muscle belly that runs distally and radially (lateral) towards the thumb. Near the insertion, the muscle ends in a flat tendon that inserts onto the radial aspect of the base of the proximal phalanx of thumb.
What muscle is responsible for thumb opposition?
Opponens pollicisOpponens pollicis extends from the trapezium bone and flexor retinaculum to the first metacarpal bone. The main function of this muscle is the opposition of the thumb in the first carpometacarpal joint.
What muscle causes thumb abduction?
Abductor pollicis brevis muscleThe abductor pollicis brevis is a muscle in the hand that functions as an abductor of the thumb. Abduction of the thumb by acting across the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb.
How do you treat abductor pollicis brevis pain?
Wear a special forearm and thumb splint called a thumb- spica splint. This splint keeps the wrist and lower joints of the thumb from moving. The splint allows the APL and EPB tendons to rest, giving them a chance to begin to heal.
How do you treat adductor pollicis brevis pain?
Most of these injuries can be treated simply by immobilising the thumb using a splint to allow the damaged ligament to heal. In the case of extensive or total ligament tear, surgery and rehabilitation is required to repair the ligament and restore thumb stability.
How do you strengthen abductor pollicis brevis?
0:361:36Exercises to Strengthen the Abductor Pollicis Brevis Muscle - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd abduct away hold for five seconds. And then slowly return back toward the palm. And then you canMoreAnd abduct away hold for five seconds. And then slowly return back toward the palm. And then you can also attach it around all the fingers. And open the entire hand holding for five seconds.
How do you treat flexor pollicis brevis muscle?
Treatment. Activate Flexor Pollicis Brevis Muscle - Place the palm facing up and wrist in a neutral position. Bring the thumb to touch the base of the little finger and apply pressure as much as possible. Hold the pressure for a few seconds and release it.
How do you treat extensor pollicis brevis?
How are Extensor Tendon Injuries Treated?Splinting the affected part to heal in proper alignment.Anti-inflammatory medications.Special exercises and hand therapy.
What is the action of the extensor pollicis 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 action of the 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.