The sympathetic nervous system controls the body's flight or fight mechanism. Learn about its vital functions, & how it regulates bodily processes.

Medically reviewed by Michael Menna, DO Key Takeaways The body's organ systems include your circulatory and respiratory ...

Find out about the sympathetic nervous system, which causes your fight or flight response, and learn more about how it functions.

The Tangled Jungle Since researchers first began to study the nervous system in ancient times, they have tended to compare its structure to contemporary technologies.

Glial cells play an important role in supporting the body's nervous system. Several types of glial cells exist. Learn more here.

How does the gut microbiota impact the nervous and mucosal immune systems? The enteric nervous system (ENS) consists of two ganglionated neural networks within the gut wall known as the myenteric ...

The discovery of sympathetic nervous system cells in lampreys draws a closer tie between the animal and complex vertebrates — such as humans.

What is ataxia? As a stand-alone condition, "ataxia is a degenerative disease of the nervous system," explains Andrew Rosen, chief executive officer of the National Ataxia Foundation.