Answer: The structure of axon bundle in nervous system is just like a telegraph wire.
Explanation: There is structural and functional similarity between the nervous system and telegraph. In a telegraph the wire of the cable are bundled to form a single cable just like the way a group of axons bundle themselves.
Also the axons are covered by a myelin (also known as white matter) to insulate them in a similar way as the plastic coating of an electric wire of telegraph. Both axon in the nervous system and the telegraph wire send signal across its ends.