Which statement about myelinated nerve fibers is incorrect?

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The conduction speed in myelinated fibers is slower compared to unmyelinated fibers.Electrical currents in the membrane occur at the nodes of Ranvier.Impulse transmission occurs via saltatory conduction.Local anesthetics are only effective when the nerve lacks a myelin sheath.

Explanation

The conduction velocity in myelinated nerve fibers is actually faster than in unmyelinated fibers due to saltatory conduction, which occurs at the nodes of Ranvier. Therefore, the statement claiming slower impulse transmission in myelinated fibers is false. Local anesthesia tends to be effective primarily on unmyelinated or demyelinated nerves.