Muscle Name: extensor pollicis brevis

AKA:  musculus extensor pollicis brevis

Abbreviation:  EPB

Spinal Nerve Roots:
    C7
    C8

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.

Pitfalls:  

Notes: