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Flexor Pollicis Brevis

Last updated on Monday, April 27 2009 by blondarb

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Muscle Name: flexor pollicis brevis

AKA:  musculus flexor pollicis brevis

Abbreviation: FPB

Spinal Nerve Roots:

Brachial Plexus Trunks:
    lower trunk

Brachial Plexus Cords:
    medial cord

Named Nerves:
    median nerve
    ulnar nerve

Proximal Attachment:  trapezoid, flexor retinaculum

Distal Attachment:  thumb, proximal phalanx

Action:  Flexes the thumb at the first metacarpophalangeal joint

Needle Insertion:  In the medial aspect of the thenar eminince.

Activation for EMG:  Flex the thumb at the metacarpophalangeal  (MCP) joint.