How are neurons classified depending on the presence or absence of myelin sheath?

Monjur Alahi

How are neurons classified depending on the presence or absence of myelin sheath?


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Salim Ahmed Kawsar

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Depending on the presence or absence of myelin sheath neurons are classified into two types: 

1. Myelinated nerve fibre/ medullated nerve fibres: These nerve fibres have an insulating fatty layer called myelin sheath around the axon. This makes the fibre appear white in colour. 

2. Non-myelinated/ non-medullated nerve fibres: These nerve fibres lack myelin sheath. The fibres are grey in colour due to absence of myelin sheath.

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