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Organisation of the PNS

At intervals,...

Question

At intervals, myelinated nerve fibres possess unmyelinated areas called ______.

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Solution

The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon. At intervals, myelinated nerve fibres possess unmyelinated areas called node of Ranvier. They provides faster transmission of electrical impulses through axon.

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Q. Give the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre.

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

Q. Short / Long answer type questions.
What is a nerve fibre? Describe the structure of a myelinated fibre.

Q. The conduction of impulse along a myelinated nerve fibre is called

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Organisation of the PNS

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