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CNS

Myelin of ner...

Question

Myelin of nerve fibres of CNS is produced and maintained by ________________.

A

Microglia

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B

Schwann cells

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C

Astrocytes

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D

Oligodendrocytes

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Solution

The correct option is D Oligodendrocytes
Oligodendrocytes are highly specialized neural cells whose function is to myelinate central nervous system axons.
Myelin sheaths are extraordinarily large extensions of the oligodendrocyte cell membrane and are highly complex structures.
Oligodendrocytes main functions are to provide support and insulation to axons in the central nervous system of some vertebrates, equivalent to the function performed by Schwann cells in the peripheral nervous system. Hence, Myelin of nerve fibres of CNS is produced and maintained by Oligodendrocytes.
So, the correct answer is 'Oligodendrocytes'.

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Similar questions

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. Distinguish between :
Impulse conduction in a myelinated nerve fibre and non-myelinated nerve fibre

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.

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