Flexor pollicis longus
Musculus flexor pollicis longus
MuscularDeep musclesArmLeft and right
View left in 3D View right in 3D
- What it is
- Deep flexor arising from the anterior surface of the radius and interosseous membrane; its tendon passes through the carpal tunnel to the distal phalanx of the thumb.
- Function
- Flexes the thumb, especially its tip joint.
- Size
- About 20 cm long.
- Clinical note
- Inability to bend the thumb tip (with an intact index fingertip) points to anterior interosseous nerve palsy. The tendon is shown only as far as the thumb's metacarpal.