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Physiology

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Central Nervous System

Question
19 out of 20
 

If a single spinal nerve is cut, the area of tactile loss is always greater than the area of loss of painful sensations, because



A Tactile information is carried by myelinated fast conducting fibres

B Tactile receptors adapt quickly

C Degree of overlap of fibres carrying tactile sensation is much less

D In the primary sensory cortex tactile sensation is represented on a larger area

Ans. C Degree of overlap of fibres carrying tactile sensation is much less
  1. Sensory changes due to interruption of a single peripheral nerve vary, depending on whether the nerve involved is predominantly muscular, cutaneous or mixed.
  2. "Following injury to a cutaneous nerve the area of sensory loss is always less than its anatomic distribution because of overlaps from adjacent nerve".
  3. "The area of tactile loss, is greater than that of pain relates both to a lack of collateralization (regeneration) from adjacent tactile fibres (in contrast to rapid collalteral regeneration of pain fibres) and to a greater overlap of pain sensory units".

Central Nervous System Flashcard List

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