Musculus flexor pollicis brevis

Musculus flexor pollicis brevis has two heads: caput superficiale and caput profundum.

The beginning:


 * carpal bones - os capitatum, os trapezoideum and ligg. intercarpalia palmaria (caput profundum)
 * retinaculum musculorum flexorum and tuberculum ossis trapezii (caput superficiale)

Extension:


 * Lateral base of the proximal phalanx of the thumb;
 * sesamoid bone of the thumb (radial).

Innervation:


 * caput superficiale: nervus medianus;
 * caput profundum: nervus ulnaris.

Function:


 * Flexion of the metacarpophalangeal joint of the thumb;
 * partial abduction of the thumb;
 * partial opposition of the thumb.