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Median Versus Ulnar – Palmar Mixed Nerve Studies

Median Nerve (Figure 10–12A)

Recording Site:

  Median nerve at the wrist:
  G1 placed over the middle of the wrist between the tendons to the flexor carpi radialis and palmaris longus
  G2 placed 3–4 cm proximally

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Stimulation Site:

  Median nerve in the palm: In the palm, 8 cm from the active recording electrode on a line drawn from the median wrist to the web space between the index and middle fingers

Distal Distance:

  8 cm

Ulnar Nerve (Figure 10–12B)

Recording Site:

  Ulnar nerve at the wrist:
  G1 placed over the medial wrist, adjacent to the flexor carpi ulnaris tendon
  G2 placed 3–4 cm proximally

Stimulation Site:

  Ulnar nerve in the palm: In the palm, 8 cm from the active recording electrode on a line drawn from the ulnar wrist to the web space between the ring and little fingers

Distal Distance:

  8 cm

Key Points:

      In normal subjects, the difference between the median and ulnar palmar latencies is <0.4 ms when the same distance is used for both studies.
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