Wrist – Thenar

Surface Recording Technique, Antidromic Study
  • Giuliano Gentili
  • Mario Di Napoli

Original Settings

Sensitivity was 10 μV/division, low-frequency filter was 20 Hz, high-frequency filter was 2 kHz, sweep speed was 1.5 ms/division, and the machine used was a two-channel Medelec Synergy Oxford Instrument. Duration of pulse and rate of pulse were not specified.


This study was performed in the supine position with the thumb (digit I) in the maximal palmar abduction.


Following the antidromic method [ 1] proposed previously by Bergeron and Braddom [ 2], the median sensory nerve conduction study was performed recording the action potentials from the palmar cutaneous branch (PCB) over the thenar eminence (Fig. 1). The active recording (A) electrode was placed on the skin of the midthenar eminence at the halfway point on an imaginary line connecting the ulnar aspect of the first metacarpophalangeal joint and the palmaris longus(PL) tendon as it crossed the distal wrist crease. The reference (R) electrode was placed distally toward the base of the digit II...


  1. 1.
    Rathakrishnan R, Therimadasamy AK, Chan YH et al (2007) The median palmar cutaneous nerve in normal subjects and CTS. Clin Neurophysiol 118:776–780PubMedCrossRefGoogle Scholar
  2. 2.
    Bergeron JW, Braddom RL (1998) Palmar cutaneous nerve recording and clarification of median premotor potential generators. Am J Phys Med Rehabil 77:399–406PubMedCrossRefGoogle Scholar
  3. 3.
    Bland JDP (2000) A neurophysiological grading scale for carpal tunnel syndrome. Muscle Nerve 23:1280–1283PubMedCrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Giuliano Gentili
    • 1
  • Mario Di Napoli
    • 1
  1. 1.Neurological ServiceS. Camillo de’ Lellis General HospitalRietiItaly

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