1. The Nervous System

2. Main parts of the nervous system
THE BRAIN is the center of the nervous system
Your nervous system is a system of nerve cells that connect your brain with every part of your body
THE SPINAL CORD is the main nerve of your body. 31 pairs of nerves branch out from your spinal cord

3. JOBS of nervous system
Sends messages from the brain to the rest of the body along nerve cells (neurons)
You taste, hear, and smell with your brain
Sensory nerve cells in your body send signals to your brain
Your brain sorts these messages and tells you what you are seeing, hearing, tasting, smelling, or feeling

4. More about the neurons They are also called neurons
Your brain has about one trillion neurons
Your spinal cord has one billion neurons
Neurons collect, receive, and send information very quickly around your body
They are found throughout your body-eyes, ears, mouth, nose, skin, muscles, joints…..

5. Dendrites and Axons Short twig like fibers
They receive nerve signals and send them into the bodies of nerve cells
These signals leave the cells on longer fibers called axons
Axons transmit information from one neuron to another

6. MORE ABOUT THE BRAIN There are 3 parts of the brain
The cerebellum- controls coordination and complex movements of your muscles (like playing sports)
Cerebrum- largest part of brain. Controls your ability to think, learn, remember
Brain stem- Control important life processes that take place in your body (attention, arousal, and consciousness…) All info passes thru here on way to brain

7. Interesting facts about brain
The right half of the brain controls the movement on the left side of your body
The left half controls the right side of your body
Weight = grams or 3 lbs (as adult)
Weight = grams (as infant)
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
The world record for time without sleep is 264 hours (11 days) by Randy Gardner in 1965

8. Interesting facts about spinal cord
Length of human spinal cord is cm
Weight is 35 grams
31 spinal nerves

10. SPINAL CORD