MEDICAL PHYSIOLOGY

Detailed explanation-1: -They may form a thick sheath of myelin or create indented plasma membrane folds around peripheral axons throughout the PNS. Where a Schwann cell covers an axon, the outer Schwann cell surface is known as the neurilemma. This shields the axon from interstitial fluids.

Detailed explanation-2: -Peripheral nervous system (PNS) myelin is formed by the differentiation of the plasma membrane of Schwann cells. One of the biochemical characteristics that distinguishes myelin from other biological membranes is its high lipid-to-protein ratio.

Detailed explanation-3: -Schwann cell, also called neurilemma cell, any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons.

Detailed explanation-4: -Schwann cells adopt one of two distinct relationships with axons, either myelinating individual axons or ensheathing multiple, small axons in what are termed Remak bundles.