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Example Questions
Example Question #11 : Understanding Structures Of The Nervous System
What are the areas of unmyelinated axon called on a neuron?
Possible Answers:
Nissl bodies
Gap junctions
Schwann cells
Axonal gaps
Nodes of Ranvier
Correct answer:
Nodes of Ranvier
Explanation:
The vast majority of neurons are myelinated (by Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system) in order to allow for saltatory conduction, which greatly increases conduction speed. This occurs as the action potential "leaps" from one node of Ranvier to the next node of Ranvier rather than having to pass down the entire length of the axon.
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