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Organisation of the PNS

why does shcw...

Question

why does shcwann cell doesn't form myelin sheath in non-myelinated nerve fibre?

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Solution

Schwann cell is the main glial cell present in peripheral nerves. Myelin sheath is an outgrowth of schwann cell and is uasually present only around axon of a neuron for normal functioning of nervous system. Schwann cells doesn't form myelin sheath in non-myelinated nerve fibre because non-myelinated fibres contains a group of smaller axons that form cavity in single schwann cell without formin a spiral of mesoaxon. These are mainly involved in axon maintainence and survival of neuron. e.g. olfactory nerve fibres.

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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. Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

Q. Consider the following statements and state true or false.
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.

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.

Q. Assertion :Myelin sheath insulates nerve fibre and prevents its depolarization Reason: Nerve impulses are conducted more rapidly in non-myelinated fibres than myelinated ones

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