Question

nerve fibers are enclosed with a tubular medullary sheath.give reason​

Answer 1

Answer:

A nerve is formed of a bundle of axons (nerve fibres) enclosed in a tubular medullary sheath. This sheath over the axon acts like an insulation and prevents mixing of impulses in the adjacent fibres.

Explanation:

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Answer 2

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A nerve is formed of a bundle of axons (nerve fibres) enclosed in a tubular medullary sheath.This sheath over the axon acts like an insulation and prevents mixing of impulses in the adjacent fibres.

Explanation

1. Sensory nerve: It contains only sensory neurons,it brings impulses from sense organs as these have sensory fibres.e.g.optic nerve of the eye.
2. Motor nerve: It contains only motor neurons,these carry impulses to muscles or glands from the brain or spinal cord. e.g.nerves going to the muscles of the eyeball.
3. Mixed nerve:It is the one which carries both sensory and motor neurons,e.g.the nerve which goes to the tongue.

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