Question

Explain the above statement in simple words....​

Answer 1

Answer:

nerve fibres or neurons are myelinated, ie enclosed by myelin sheath, in the nerve fibres arising from brain and spine (cranial and spinal nerve). the myelin sheath is secreted by certain cells called schwann cells. but exceptionally the schwann cells present in the neuron of autonomous and somatic neural system, doesnt secrete myelin and hence they are unmyelinated.

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Answer 2

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★ Myelinated nerve fibers are nerve fibers that are insulated by a myelin sheath whereas unmyelinated nerve fibers are nerve fibers that do not have a myelin sheath.

★ Myelinated neurons are neurons whose axons are surrounded by myelin; the myelin has has an insulating effect and allows the axons to conduct neural impulses faster.

★ Myelinated nerve fibres are found in spinal and cranial nerves where signals have to be conducted at a faster rate.

nerve fibres are found in spinal and cranial nerves where signals have to be conducted at a faster rate.Unmyelinated nerve fibres are commonly found in autonomic and somatic nervous systems.

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