Spinal Reflexes – Myotactic (Stretch) Reflexes – Extensor Carpi Radialis Reflex
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Myotactic (Stretch) Reflexes

Extensor Carpi Radialis Reflex

• Anatomy and Physiology
  The extensor carpi radialis muscle is one of the extensors of the carpus. It is innervated by the radial nerve. The origin of this reflex is C7-T1 in the spinal cord.
• Assessment
  The limb is supported under the elbow, maintaining a flexed elbow and carpus. The muscle belly is struck distal to the elbow. The expected response is a slight extension of the carpus.