A node of Ranvier (myelin sheath gap)
A) occurs only in ganglia.
B) is one segment of the myelin sheath.
C) occurs in the PNS but not in the CNS.
D) is a bare region of axonal membrane in myelinated axons only.

Question

Quizplus · Accepted Answer

A node of Ranvier is a small gap that occurs in the myelin sheath of myelinated axons. It is a bare region of axonal membrane where the axon is not covered by myelin. Nodes of Ranvier are important for the rapid conduction of nerve impulses along the axon. Nodes of Ranvier occur in both the central nervous system (CNS) and the peripheral nervous system (PNS).

A Node of Ranvier (Myelin Sheath Gap)