Musculus abductor pollicis brevis

Beginning:


 * tuberculum ossis scaphoidei;
 * retinaculum musculorum flexorum.

Tendon:


 * Base of proximal article of thumb;
 * sesamoid bone of thumb (radial).

Innervation:


 * nervus medianus.

Function:


 * Abduction of the thumb (like the musculus abductor pollicis longus).