Schwann cells differ from oligodendrocytes in which of the following ways?
A. Oligodendrocytes are only found in the PNS; Schwann cells are only found in the CNS.
B. Schwann cells form sheaths around several axons, while oligodendrocytes form sheaths around only one axon.
C. Schwann cells form myelin; oligodendrocytes do not.
D. Schwann cells form a myelin sheath around a portion of only one axon, while oligodendrocytes can surround portions of several axons.
E. None of the choices are correct.
Answer: D
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