The central nervous system controls all of the body's activities and is made up of the brain and spinal cord. The spinal cord connects the brain to the rest of the nervous system and sends messages to the brain. The brain is divided into three main parts - the cerebrum, cerebellum, and brain stem. The cerebrum controls functions like thinking, memory, and movement. The cerebellum controls balance and posture. The brain stem connects the brain to the spinal cord and controls vital functions. Sense organs gather environmental information and send it to the central nervous system via the outer nervous system.

2. * The Central Nervous System controls all of the body’s
activities.
* The Central Nervous System is made of two
main organs.
1. The brain
2. The spinal cord

3. * The spinal cord sends messages to the
brain.
* The spinal cord is the part of the nervous system that
connects the brain to the rest of the nervous system.

4. * The brain controls everything in the
body.
* The brain is made of more than 10
billion nerves!
* The brain is divided into three parts
and is protected by the skull.

5. Do you know how much heavy
the brain is?

6. * The Brain has three main parts…
1. The Cerebrum
2. The Cerebellum
3. The Brain Stem

8. * The Cerebrum is the largest part of the brain.
1. The cerebrum controls your thinking.
2. The cerebrum controls your memory.
3. The cerebrum controls your speaking.
4. The cerebrum controls your movement
and identifies the information gathered by
your sense organs.

9. * The cerebellum is below and to the back of
the cerebrum.
1. The cerebellum controls you balance.
2. The cerebellum controls your posture.

11. * The Brain Stem connects the brain to
the spinal cord.
* The nerves in the brain stem control
your heartbeat, breathing, and blood
pressure.

12. * The vertebrae are the many bones
that protect the nerves in the spinal
cord.

14. * The Outer Nervous System’s job is
to connect the Central Nervous
System to the rest of the body.
* The outer nervous system carries
messages between the central nervous
system and the rest of the body.

15. * The outer nervous system is made of
the nerves and the sense organs.
Ear Eye
Skin
Nerves
Tongue
smell

16. * An automatic reaction that happens
without thinking about it.
* A reflex happens quickly in
less than a second.

17. * The outer nervous system controls
the body’s activities that you don’t
think about.
* The outer nervous system controls
activities in your small intestine, your
breathing, and your heartbeat.
controls

18. Sense organs
carry messages
about the
environment to
the central
nervous system.

19. The environment is everything
outside the body.
The sense organs gather
information from outside the body,
then send the messages to the
brain.

21. How eyes work
First light enters the eye through the cornea, and
passes through the pupil.
The iris controls the amount of light.
The light goes through the lens, which the image is
sharp.
The retina receives the light, and sends the
information through the optic nerve to the brain.
The brain create the images we see.

22. When a sound is made, the air
around the sound vibrates.
Hearing starts when some of the
sound waves go into the ear.

24. How ears work
Sound enters our body through the outer ear, travels
down the ear canal to the ear drum, and makes it
vibrate.
The way the ear drum moves depends on the type of
sound that receives.
This ear drum movement is transmitied to the small
bones of the ear (the hammer, the anvil, and the
stirrup), and reaches the cochlea.
The information collected by the cochlea travels to
the brain through the auditory nerve.
The brain interprets the nerve impulses as sound.

25. Do you know what the ear
controls??

26. The sense of touch is located in the skin.
The nerves in the skin allow us to feel
texture, pressure, heat, cold, and pain.
Texture is how something feels.

28. SMELL AND TASTE

29. HOW SMELL AND TASTE WORK.
Smell goes through nostril to nasal cavities and reach
the olfatory bulb with contains the cells that detect
semlls.
When we eat food takes contact with the taste buds
on our tongue and palate.

30. Do you know…?
You have a nerve along your whole arm.
The “funny bone” is the only place on the arm
where the nerve is not protected.
The “funny bone” is on the elbow.
http://kidshealth.org/kid/talk/qa/funny_bone.html

32. Do you know how we can keep
all our sense organs clean and
healthy?

33. Do you know how we can take
care our brain?

34. What are the main subsystems
of the nervous system?

35. What are the parts of the central
nervous system?
And the outer nervous system?
What are the main parts of the brain?

37. Cerebrum. The cerebrum is the largest part of the
brain and makes up 85% of the brain’s weight.
Water. The brain is made up of about 75% water.
No pain. There are no pain receptors in the brain, so
the brain can feel no pain.
Stopped growing. Your brain stopped growing at
age 18.
New neurons. Humans continue to make new
neurons throughout life in response to mental
activity.
Sleep. While you sleep at night may be the best time
for your brain to consolidate all your memories from
the day.