Musculus flexor pollicis brevis

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.

References

• ČIHÁK, Radomír. Anatomie 1. 2. vydání. Praha : Grada, 2001. 497 s. ISBN 80-7169-970-5.