The Nervous The Nervous SystemSystem

By: Katherine PeaseBy: Katherine Peasehttp://powerbacks.com/web_pages/science.html

What is your Nervous What is your Nervous System?System?

What does it do for What does it do for you?you?

Brainstorm answers as a classBrainstorm answers as a class

Listen and Watch to see if correct.Listen and Watch to see if correct.

So…So… What is your What is your

Nervous System? Nervous System?The Nervous System The Nervous System is a busy and complex is a busy and complex network of nerves.network of nerves.

Here is another way to look at it…Here is another way to look at it…

Central Nervous Central Nervous System is…System is…

consists consists of the brain of the brain and spinal and spinal chordchord

Peripheral Nervous Peripheral Nervous System is…System is…

Consists of the Consists of the nerves that run nerves that run through out the body.through out the body.

These nerves carry These nerves carry messages between messages between the central nervous the central nervous system and the body.system and the body.

http://www.bbc.co.uk/science/humanbody/body/factfiles/nervous_anatomy.shtml

The Nervous system has The Nervous system has 3 main parts….3 main parts….

BrainBrainNeuronsNeuronsSpinal ChordSpinal Chord

http://www.contmediausa.com/shop/app/products/Human3D/human3dnervoussystem.html

What is the main What is the main function of the brain?function of the brain?

It is the control center It is the control center for the entire body.for the entire body.

The brain contains…The brain contains…CerebrumCerebrumCerebellumCerebellumMedullaMedullaSpinal ChordSpinal Chord

http://www.brainhealthandpuzzles.com/diagram_of_brain.html

Function of the Function of the Cerebrum…Cerebrum…To control thinking, To control thinking,

learning, memory, learning, memory, awareness, and some awareness, and some voluntary movements.voluntary movements.

It controls all the It controls all the sensessenses

Larges part of the brainLarges part of the brain

Function of the Function of the Cerebellum…Cerebellum…

It controls muscle It controls muscle activity and balance.activity and balance.

Located at the back of Located at the back of the head.the head.

Function of the Function of the Medulla…Medulla…

Smallest part of brainSmallest part of brainControls automatic functions such asControls automatic functions such as

BreathingBreathingHeartbeatHeartbeatGland secretionsGland secretionsReflexesReflexesDigestive actionDigestive action

Function of the Spinal Function of the Spinal Chord…Chord…

It carries messages It carries messages between the brain between the brain and the rest of the and the rest of the body.body.

It is protected by the It is protected by the backbone.backbone. Spinal chord

What are Neurons and What are Neurons and what are their what are their

function?function?Nerve CellsNerve CellsFunction is to carry electric Function is to carry electric

messages (impulses).messages (impulses).

http://serendip.brynmawr.edu/bb/kinser/Nerve7.html

Types of NeuronsTypes of NeuronsMotor NeuronsMotor Neurons: carry impulses away : carry impulses away

from the central nervous system to from the central nervous system to muscles and glands.muscles and glands.

Sensory NeuronsSensory Neurons: carry impulses : carry impulses from receptors in sense organs to the from receptors in sense organs to the central nervous system.central nervous system.

Inter-neuronsInter-neurons: connect sensory : connect sensory neurons and motor neuronsneurons and motor neurons

Parts of a neuron…Parts of a neuron…

http://serendip.brynmawr.edu/bb/kinser/Nerve7.html

Parts of Neuron Parts of Neuron Function…Function…Dendrites: carry Dendrites: carry

message toward the message toward the nerve cell bodynerve cell body

Axon: carry message Axon: carry message away form nerve to away form nerve to cell bodycell body

Parts of Neuron Parts of Neuron Function…Function…Synapses: Small Synapses: Small

space between space between cellscellsImpulses travel Impulses travel

across them to across them to connect sensory connect sensory neurons to neurons to motor neuronsmotor neurons

A reflex arc is …

the neural pathway that a nerve impulse follows.

Click link below to Click link below to see / learn about a see / learn about a

nerve impulsenerve impulse

http://learn.genetics.utahhttp://learn.genetics.utah.edu/content/addiction/re.edu/content/addiction/reward/neurontalk.htmlward/neurontalk.html

Let’s Review what we learned…Let’s Review what we learned…