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What Is a Neuron

Myelin sheath...

Question

Myelin sheath in PNS is formed by schwann cells and in CNS myelin sheath is formed by oligodendrocytes. Am I correct?

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Solution

gokul you are right,,samyuktha you are saying it in a opposite manner

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Q. Myelin sheath is produced by oligodendrocytes in CNS and Schwann cells in PNS. But unmylinated neurons are present in ANS and SNS...how are they unmylinated if oligodendrocytes produce them??

Q. Match the items given in column I with those given in column II.
Choose the correct option.

	Column I		Column II
a.	Oligodendrocytes	(i)	Synthesize myelin sheath in PNS
b.	Multipolar neurons	(ii)	Cerebral cortex
c.	Schwann cells	(iii)	Synthesize myelin sheath in CNS
d.	Bipolar neurons	(iv)	Retina of eye

Q. Is myelin sheath present around the Schwann cell or Schwann cells are present around myelin sheath?

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

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