A nerve is an enclosed, cable-like bundle of axons in the peripheral nervous system
Neuron are found in nervous system in all the body.

This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Nerves are the longest cell of our body. They constitute of smaller & functional units called neurons. They help in sending messages to & fro from our brain to various parts of our body & vice-versa.
types of neurons ( Structure)
i) non-polar
ii) uni polar
iii) Pseudounipolar 
iv) multipolar