Constrictions at intervals in a nerve fibre are known as

Nodes of Ranvier

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Nodes of schwann

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Dorsal fissure

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Ventral fissure

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Solution

The correct option is A
Nodes of Ranvier

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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Constrictions at intervals in a nerve fibre are known as

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