The ~nodes~ of Ranvier are the small constricted portions of the neuron's |myelin sheath| which separate the |axons| along the cell's length. These narrowings, or gaps, are more permeable to potassium and sodium ions than the rest of the |axon| body. Consequently, these ~nodes~ allow ~nerve~ impulses to be transmitted from the |axons|, where otherwise the impulses would be shielded by the insulating |myelin sheath|.
