1. What are the main parts of the human nervous system?
Q.Q. 4/2/19
What are the main parts of the human nervous system?
The brain, the spinal cord and nerves

2. Unit #10: Human Body Systems
The Nervous System

3. What is the role of the Nervous System?
Your nervous system receives information both inside and outside of your body.
Then, it processes the information and forms a response to it.
The basic unit of the nervous system is a type of cell called a neuron.

4. Neuron Structure
Neurons carry messages from one part of your body to another.
A neuron has 3 basic parts.
1) Dendrites – carry message TO the cell body
2) Cell body – relays message; contains main cell structures (i.e. nucleus, mitochondria, etc.)
3) Axon- – carry message AWAY from the cell body

5. Neuron Structure Animation Dendrite Dendrites carry nerve
Receiving Impulse!
Neuron Structure
Animation
Dendrite
Dendrites carry nerve
impulses toward a
neuron’s cell body.
Cell Body
The cell body controls
the cell’s basic functions.
Synapse
The space between
an axon of 1 neuron and the dendrites of another.
Axon
Impulses travel along axon away from cell to next cell.
Myelin Sheath
Some axons are covered
by a myelin sheath
that increases the speed
of an impulse.
*multiple schlerosis disease animation

6. *peripheral = to the sides (peripheral vision)
Nervous System
The nervous system consists of two major divisions:
central nervous system
peripheral nervous system.
*The central nervous system - the control center of the body. It includes the brain and spinal cord.
*The peripheral nervous system - all the other body nerves, connecting to the brain and spinal cord.
*peripheral = to the sides (peripheral vision)

7. 1
Your Nervous System
1) Brain 2
2) Spinal cord
3) Peripheral nerves 3

8. The Spinal Cord
The spinal cord is a thick column of nerve tissue that connects the brain to nerves in the peripheral nervous system.

9. Major Parts of the Brain
1) The cerebrum- main region that receives messages from sense organs, controls thinking, memory, communication, and reasoning.
2) The cerebellum- coordinates your body’s movements and helps you keep your balance.
3) The brain stem- controls many of your body’s involuntary actions

12. 1) The Cerebrum
The largest region of the brain and is responsible for conscious activities and intelligence, learning and judgment.
Divided into 2 Hemispheres (Left and Right)
Each hemisphere deals with mainly the opposite side of the body.
The hemispheres are connected by a band of tissue called the corpus callosum

13. Facial movements Animations

14. 4 Lobes (regions) of the Cerebrum:
Frontal Lobe – Evaluating consequences, making judgments, forming plans
Parietal Lobe – Reading and Speech
Temporal Lobe – Hearing and Smell
Occipital Lobe - Vision

15. Mixed Messages
Test how well your brain can handle conflicting messages.
Try This
Read the list of words, saying the color of each word as your partner times you. Do not read the words, rather identify their colors.

16. Mixed Messages

17. Cerebellum – second largest region of brain
Coordinates and balances the action of muscles
This enables the body to move gracefully and efficiently.
“Bell” shape =
“Ball” in the back”!

18. 3) Brain Stem – connects the brain and the spinal cord
Important functions include: regulation of blood pressure, heart rate, breathing and swallowing.
Consists of 3 structures:
the midbrain – noise & light adjusting
Pons - breathing
Medulla oblongata– heart rate, swallowing

20. Ticket Out!
Complete the Brain diagram and glue in notebook to be checked before leaving today!