Neurons perform several important tasks:

Afferent neurons are sensory neurons. They relay messages from the sense organs and receptors to the brain or spinal cord. These are the eyes, ears, nose, mouth, and skin.

Efferent neurons are the motor nuerons. They convey signals from the brain and spinal cord to the glands and the muscles, enabling the body to move.

Inter-neurons, are thousands of times more numerous than motor or sensory neurons. They carry information between neurons in the brain and between neurons in the spinal cord.