OPPONENS POLLICIS
Origin
Flexor retinaculum and tubercle of trapezium
Action
Opposes (med rotates and flexes ) CMC and MCP jnts of thumb
Insertion
Whole of radial border of 1st MC
Nerve
Recurrent (muscular) br of median N (C8,T1) (may also be from deep br of ulnar N (T1))