Extensibility probably. Because neuroglia isn't involved in conduction of impulse for sure. Neither does it excites an impulse as that would be the function of a synapse. It might be extensibility

Answer: Cell division

Explanation:Only type of neural cell which can divide are the Neuroglial Cells. They don't conduct signal as they lack excitability. And extensibility is the feature of Muscular cells. None of the neurons ever show extensibility.