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(D) $Schwann$ cells are the primary glial cells of the peripheral nervous system $(PNS)$.They are responsible for the formation of the myelin sheath a

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Both myelinated and unmyelinated nerve fibers

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(D) $Schwann$ cells are the primary glial cells of the peripheral nervous system $(PNS)$.They are responsible for the formation of the myelin sheath around the axons of neurons.In myelinated nerve fibers,$Schwann$ cells wrap around the axon multiple times to form the myelin sheath.In unmyelinated nerve fibers,$Schwann$ cells still surround the axons but do not form a thick myelin sheath.Therefore,$Schwann$ cells are associated with both myelinated and unmyelinated nerve fibers.

The covering of $Schwann$ cells is associated with:

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