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:
- Maximal zone: Maximal area supplied by a peripheral nerve
- Intermediate zone: Area of overlap of the maximal zone of different peripheral nerves
- 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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