Q.The supporting cells that produce myelin sheath in the PNS are _________.
Schwann cells are the PNS glial cells that build the myelin sheath around peripheral nerves.
Myelin-producing glial cells differ by location. In the CNS, oligodendrocytes wrap central axons in myelin. In the PNS, Schwann cells do the equivalent job, wrapping peripheral axons in myelin.
Step 1. Eliminate Oligodendrocytes -- these are the CNS myelin-formers, not PNS.
Step 2. Eliminate Satellite cells -- these support neuron cell bodies (especially in ganglia) but do not themselves form myelin.
Step 3. Eliminate Astrocytes -- these are CNS-only cells that maintain the blood-brain barrier and regulate neurotransmitter levels, not myelin-formers.
Step 4. Schwann cells remain -- the PNS's most abundant glial cell, whose specific job is producing the myelin sheath of medullated peripheral nerves.
(d) Schwann cells.
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