Abductor Pollicis Brevis

Images: Thenar atrophy


Origin: Transverse carpal ligament, the Scaphoid and Trapezium

Insertion: Radial base of Thumb Proximal Phalanx and the thumb extensor mechanism

Function: Abducts the Thumb basal (carpometacarpal) Joint along with other muscles which palmar abduct and radial abduct the basal joint, and extends the thumb interphalangeal Joint

Nerve: Motor Branch of Median Nerve

Artery: Superficial Volar Branch of Radial artery

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