Nerve cells. They carry electrical messages from one area of the body to another area.

Long bundles of neurons that run inside of your vertebral column. It carries impulses from all parts of the body to the brain and from the brain to all parts of your body. Reflex arcs occur here.

Regulates the flow of information between the brain and the rest of the body.

A neuron that picks up stimuli from the internal or external environment and converts each stimulus into a nerve impulse.

neurons that carry outgoing information from the brain and spinal cord to the muscles and glands

The mass of nerve tissue that is the main control center of the nervous system

A neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.

any event or situation that evokes a response

An action or change in behavior that occurs as a result of a stimulus.