Hand Exam: Motor 12/13 – Extensor Carpi Ulnaris (ECU)

Extensor Carpi Ulnaris (ECU)

  • Instruct the patient “Pull your hand up and out to the side”
  • Insertion: base of 5th metacarpal
  • Action: primarily ulnar deviation of the wrist, helps with wrist extension some too
  • Innervation: posterior interosseous branch of the radial nerve
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