Explain the structure of a motor nerve cell with the help of a diagram.

A neuron is the longest cell of our body. It has three parts — cell body, axon and dendrites.

1. The cell body called cyton contains the nucleus.
2. Many short fibres called dendrons arise from the cell. They further divide to form dendrites. Dendrites receive messages from other neurons.
3. A single, long fibre called axon extends from the other side of the cell body. It is covered by a sheath called myelin sheath.

Below diagram shows the structure of a neuron: