Balance - How Do We Do It?
How does our sense of balance work?
Motion sickness relates to our sense of balance and equilibrium.
Researchers in space and aeronautical medicine call this sense
spatial orientation, because it tells the brain where the body is "in
space:" what direction it is pointing, what direction it is moving,
and if it is turning or standing still.
Our sense of balance is regulated by a complex interaction of the
following parts of the nervous system:
The inner ears (also called the labyrinth) monitor
the directions of motion, such as turning or forward-backward, side-to-side,
and up-and- down motions.
- The eyes observe where the body is in space (i.e.,
upside down, right side up, etc.) and also the directions of motion.
- Skin pressure receptors such as those located in the
feet and seat sense what part of the body is down and touching the ground.
- Muscle and joint sensory receptors report what parts
of the body are moving.
- The central nervous system (the brain and spinal cord) processes
all the bits of information from the four other systems to make some
coordinated sense out of it all.
For more information regarding the sense of balance and
health, please see MedicineNet.com's Motion
Sickness Center and Vestibular Disorders Center.
Last Editorial Review: 4/5/2002