By …Beezer, Billie, Kaitlyn, and Joey

The Nervous System

What goes on inside the nervous system?

Nervous Systems• Central nervous system(CNS) –

includes your brain and spinal cord. It processes messages.

• Peripheral nervous system – consists of nerves which connect everything to the CNS

Nervous System Vocabulary

• Neurons – transfer messages throughout your body using electrical energy.

• Impulses – the electrical messages that pass along neurons.

• Dendrites – extensions of neurons by which the neurons receive information.

Nervous System Vocabulary

• Axon – a fiber that transmits information to other neurons

Central Nervous System

• The CNS works close with the PNS.• It gets information from the sensory

neurons and gives messages to various parts of the body and motor neurons.

The Peripheral Nervous System

• The structure of the neuron starts with the axons which breaks into axon terminals, connects to dendrites which connect to the cell body which protects the nucleus.

• Neurons have a cell body, dendrites, and axons.

• A neuron has many dendrites, allowing it to receive impulses from many other cells.

The Brain

Vocabulary

• Brain: The biggest organ in the nervous system.• Involuntary: Processes that the brain controls

automatically.• Voluntary: Activities controlled by your nerves and

brain.• Cerebrum: The largest part of the brain where your

thoughts and memories are stored.• Hemispheres: The two halves of the cerebrum.• Medulla: The part of the brain that connects to the

spinal cord that controls blood pressure, heart rate, involuntary breathing, and other involuntary activities.

• Cerebellum: The second largest part of the brain that controls the body’s position.

Cerebrum• The largest part of your brain.• Voluntary.• Memories and thoughts are

stored there.

Cerebellum• The second largest part of the

brain.• Keeps track or the body’s

position.(balance)• Located right below the

cerebrum.

Medulla

• Connects to spinal cord.• Small.• Controls heart rate.• Blood pressure.• Involuntary breathing and other

involuntary activities.

The Nerves

Nerve Vocabulary• Nerves – Axons bundled together with blood

vessels and connective tissue.

• Motor neurons- a neuron that sends impulses from the brain and spinal cord to other systems.

• Reflex – A quick involuntary action that allows you to move before the information reaches your brain.

Nerves• Nerves connect CNS to the body• Nerves extend throughout the body.• Most of the nerves contain the axons

of both sensory and motor neurons.• The structure of the nerve starts

with the spinal cord and connects to the nerves, goes to the axon, to the axon terminal and ends with the muscle fiber.

Spinal Cord

Vocabulary• Impulses- the electrical messages that

pass along the neurons.• Receptors- specialized dendrites that

detect changes inside and outside the body.

• Nerves- axons bundled together with blood and connective tissue.

• Brain- part of your central nervous system, is the nervous system’s largest organ.

Neurons- specialized cells that transfer messages throughout the body in the form of fast-moving electrical energy.Reflex-a quick, involuntary action

Vocabulary

Vertebra• Bones that surround the spinal cord that

are there to help protect it.

Receptors

• Receptors are sensory neurons that detect changes inside and outside the body.

Receptors

• Receptors are sensory neurons that detect changes inside and outside the body.

Fun Facts

• There are about 100 billion neurons in the brain.

• The Nervous System can transmit impulses as fast as 100 meters per second.

• The right half of the brain controls imagination and creativity, while the left half controls speaking, reading, writing, and solving problems.

• The brain is actually made up of 75% water.

Thank you for your attention. We made this PowerPoint especially for you! Yes you! We really wanted you to learn about the nervous system so we were very excited to make this. Now if you didn’t enjoy this PowerPoint then your missing out! The nervous system is too cool, and if you didn’t like it then well…that’s not very nice. The nervous system is VERY sad…=(….see look how sad it is! But if you LIKED it well then that’s a whole new story that we can’t get into because I’m running out of space on this Slide…awwww! Well bye!!!