Question

Define neuron.

Answer 1

Definition (Neuron):

Neurons are the fundamental units of the brain and nervous system which is responsible for receiving sensory input from the external world, sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between.

Salient features:

1. A neuron consists of a cell body, dendrites, axon, and axon terminals.
2. neurons resemble a small tree with fine hair-like structures arising from its terminals.
3. The length of a nerve cell can vary from nanometers to meters.
4. All neurons are variations on a common structural theme.