Medically reviewed by Nicholas R. Metrus, MD Key Takeaways Neurons are cells that transmit electrical signals through the nervous system.Motor neurons control muscle activity and movement by carrying ...

Researchers developed a way to help people with amputation or paralysis regain limb control. Their optogenetic technique could offer more precise control over muscle contraction, along with a dramatic ...

Alex Smith was 11 years old when he lost his right arm in 2003. A drunk driver operating a boat collided with his family’s vessel on Lake Austin, sending him overboard. He hit a propeller, and his arm ...

Everyone is familiar, at least hand-wavingly, with the distinction between slow-twitch and fast-twitch muscle-fiber types. The former are great for running marathons; the latter are ideal for ...