Flexor Pollicis Brevis

flexor pollicis brevis

MusclePro

Anatomy

Origin: Flexor retinaculum and trapezium, and first metacarpal bone.
Insertion: Base of proximal phalanx of thumb.
Nerve: Lateral portion—median nerve (C8, T1). Medial portion—ulnar nerve (C8, T1).
Actions: Flexes metacarpophalangeal joint of thumb, assists in abduction and rotation of thumb, acts together with other muscles of thenar eminence to oppose thumb to other fingers.

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