• The nervous system is made up of the brain, spinal cord,
and a network of neurons. This system is responsible for
sending, receiving, and interpreting information from all
parts of the body. This system can be divided into two
parts: the central nervous system and the peripheral
nervous system.
• The central nervous system is the processing center
for the nervous system. It receives information and
sends information to the peripheral nervous system.
The two main organs of the central nervous system are
the brain and spinal cord. The brain processes
sensory information sent from the spinal cord. Both
the brain and spinal cord are protected by three layers
of tissue called the meninges.
• The peripheral nervous system carries information to
and from the central nervous system. There are two
types of cells in the peripheral nervous system.
These cells carry information to and from the central
nervous system. Cells of the sensory nervous
system send information to the central nervous
system from internal organs.
• Each neuron receives an impulse and must pass it on to
the next neuron and make sure the correct impulse
continues on its path. Through a chain of chemical
events, the dendrites pick up an impulse through the
axon and transmitted to the next neuron. The entire
impulse passes through a neuron in about seven
milliseconds — faster than a lightning strike.
• There are more nerve cells in the
human brain than there are stars in
the Milky Way.
• An average adult male brain weighs
about 1375 grams.
• An average adult female brain is
about 1275 grams.
• The left side of human brain controls
the right side of the body and the right
side of the brain controls the left side
of the body.
The Nervous System works with many other systems in
your body they include:
• Skeletal System because the bones provide calcium that
is essential for the function of the nervous system
• Respiratory System because the brain monitors
respiratory volume and blood.
• Muscular System because receptors in muscles provide
the brain with info about body positions and
movements.
BRAIN
SPINAL CORD
NERVES
http://www.emc.maricopa.edu/faculty/farabee/biobk/biobo
oknerv.html
http://en.wikipedia.org/wiki/Nervous_system
http://faculty.washington.edu/chudler/organ.html