Autonomous Sensory Zones of Peripheral Nerves


Autonomous Sensory Zones of Peripheral Nerves


Definition: These are the regions where single nerve roots supply distinct and non-overlapping areas of skin. By their nature the “autonomous zones” represent only a small portion of any dermatome and only a few nerve roots have such autonomous zones. The size of autonomous zone for a particular nerve is variable from individual to individual.
Sensory zones of a Peripheral nerve:
  1. Maximal zone: Maximal area supplied by a peripheral nerve
  2. Intermediate zone: Area of overlap of the maximal zone of different peripheral nerves
  3. Autonomous zone: Area exclusively supplied by a particular peripheral nerve
Note:
  • Maximal zone = Intermediate zone + Autonomous zone
  • With the interruption of a sensory nerve, all modalities of cutaneous sensation are lost only over the autonomous zone.
  • Within a few days of complete interruption of a sensory nerve, the autonomous zone shrinks and the intermediate zone enlarges, which may be due to actual ingrowth of fibers from adjacent normal nerve.




  • Radial nerve: 1st dorsal web space of hand (Anatomical snuff box)
  • Median nerve: Distal phalanx (tip) of index finger (2nd finger)
    • Other: Tip of thumb
  • Ulnar nerve: Distal phalanx (tip) of little finger (5th finger)
  • Common peroneal nerve/Common fibular nerve/External popliteal nerve/Lateral popliteal nerve: Central strip on dorsum of foot
  • Deep peroneal nerve: 1st dorsal web space
  • Posterior tibial nerve: Sole of foot
  • Sciatic nerve: Mixed pattern of Common peroneal nerve and Posterior tibial nerve

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