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Extensor Pollicis Brevis

Last updated on Monday, April 27 2009 by blondarb

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Muscle Name: extensor pollicis brevis

AKA:  musculus extensor pollicis brevis

Abbreviation:  EPB

Spinal Nerve Roots:

Brachial Plexus Trunks:
    middle trunk
    lower trunk

Brachial Plexus Cords:
    posterior cord

Named Nerves:
    radial nerve

Proximal Attachment:  radius

Distal Attachment:  Thumb, proximal phalanx

Action:  extension of thumb at metacarpophalangeal joint

Needle Insertion:  Three to four centimeters proximal to the distal tip of the radius in the pronated forearm.

Activation for EMG:  Extend the thumb.