electrical pulses produced by neurons travel along specialized extensions called:

Axon.

Explanation:

Neurons have three parts namely, a cell body(perikaryon), dendrites and axon.Axon is the thin tapering long process that conduct nerve impulses away from the cell body towards succeeding neurons or target organs.Axons are covered by a protective myelin sheath that provides insulation to nerve fibres. The myelin sheath are interrupted by small gaps called Nodes of Ranvier.The Nerve impulse travels from one node to another.