Which of the Following Statements Concerning Myelination is True

Question

Which of the following statements concerning myelination is true?
A) Unmyelinated axons rest in invaginations of Schwann cells or oligodendrocytes.
B) Myelination will not influence the speed of conduction of action potentials.
C) The myelin sheath inhibits the flow of electrical charges at nodes.
D) The myelin sheath is a protein wrapping.
E) The myelin sheath does not electrically insulate the axons from one another.

Accepted Answer

Unmyelinated axons indeed rest in invaginations of Schwann cells in the peripheral nervous system or are associated with oligodendrocytes in the central nervous system, even though they are not wrapped by myelin sheaths. This arrangement allows for some degree of support and protection, albeit without the significant increase in conduction velocity afforded by myelination.