Reflex actions are quick because there is a direct link in the spinal cord called an inter neuron (between the sensory neuron and a motor neuron) that causes a muscle to make the protective response.

The axons of a neuron – the arm-like structures ... School of Medicine took a fresh look at the nanoscopic structure of mouse brain cells to reveal a "pearls on a string" structure.

Neurons are cells that act as the brain's fundamental building blocks, transmitting information through electrical signals. When a neuron receives a stimulus, changes in membrane voltage (the ...