Schwann cells are neuroglial cells that produce myelin in the peripheral nervous system.
However, not all axons are myelinated - some will remain unmyelinated.
There must be some signal that indicates which cells are to be myelinated - what is it?
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$\begingroup$ Are you asking what the signal is that makes some neurons remain un-myelinated? "Unable to form" seems to imply that they should be myelinated but somehow fail to be, rather than that some should be myelinated and others should not. Or are you asking why myelination is not necessary for all neurons? $\endgroup$ – Bryan Krause♦ Sep 6 '18 at 18:07
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$\begingroup$ I m asking that why schwann cells donot form myelin sheath around axon in non myelinated neurons? $\endgroup$ – user45858 Sep 6 '18 at 18:44
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$\begingroup$ Are you asking what the signal is that makes some neurons remain un-myelinated, or are you asking why myelination is not necessary for all neurons? $\endgroup$ – Bryan Krause♦ Sep 6 '18 at 18:45
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1$\begingroup$ Yes I m asking what the signal is that makes some neurons unmyelinated? $\endgroup$ – user45858 Sep 6 '18 at 18:48
