ABDUCTOR POLLICIS BREVIS
Origin
Tubercle of scaphoid & flexor retinaculum
Action
Abducts thumb at MCP & CMC jnts
Insertion
Radial sesamoid of prox phalanx of thumb & tendon of extensor pollicis longus
Nerve
Recurrent (muscular) br of median N (C8, T1) occasionally by ulnar N
