What is the difference between Medullated Nerve Fibres and Non-Medullated Nerve Fibres ?

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Medullated Nerve / Myelinated Fibre:

1. The axon is surrounded by a layer of fatty proteinaceous materials called myelin sheath.

2. The myelin sheath provides white colour to the nerve fibre.

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3. Presence of nodes of Ranveir.

4. The conduction of nerve impulse is faster.

5. They are found in brain and spinal chord.

Non-Medullated Nerve / Non-Myelinated Fibre:

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1. Myelin sheaths are absent.

2. It appears grey in colour due to absent of myelin sheath.

3. Nodes of Ranveir are absent.

4. The conduction of nerve impulse is slower.

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5. These are found in sympatric and para-sympathetic nerves.

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