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Question
Constrictions at intervals in a nerve fibre are known as
Options:
A .  Nodes of Ranvier
B .  Nodes of schwann
C .  Dorsal fissure
D .  Ventral fissure
Answer: Option A
:
A
Nodes of Ranvier, also known as myelin sheath gaps, are periodic gaps in the insulating myelin sheaths of myelinated axons where the axonal membrane is exposed to the extracellular space.

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