Nervous system
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Nervous System. Tina Remes Walters 2011. Stimulus. Any internal or external changes that brings about a response. Outside the body: noise light temperature Inside the body: hormones. Homeostasis.

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Nervous System

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Nervous System

Tina Remes Walters



Any internal or external changes that brings about a response.

Outside the body: noise



Inside the body: hormones


The regulation of steady, life-maintaining conditions inside of an organism.

Examples: heart beat



Message carried by neurons.


Nerve cells

Parts: 1. Cell body

2. Dendrites receives impulses from the

neurons and sends them to

the cell body.

3. Axon carries impulses away from the

cell body.

Types of Nerve Cells

  • Sensory Neurons receives information and

    sends impulses to the brain

    and spinal cord. Message

    is then sent to the motor


Types of Nerve Cells

  • Motor Neurons Impulses from the brain or

    spinal cord to muscles or


  • Interneurons Relays messages to motor

    neurons from the sensory



Space between Neurons

Nervous System

Central Nervous System

  • Brain

  • Spinal Cord

Peripheral Nervous System

  • Nerves outside of the central nervous system

  • Connects the brain & the spinal cord to other parts of the body.

The Brain

  • Coordinates all of your body activities.

  • 100 billion neurons

  • 10% of all neurons in

    the body.

The Brain

  • Cerebrum a. Thinking

    b. Largest part of the brain.

    c. Impulses from senses are


    d. Stores memories

    e. Controls movement

    f. Cortex outer layer

    ridges and grooves

The Brain

  • Cerebellum a. Stimuli from eyes, ears,

    muscles and tendons are


    b. Coordinates voluntary

    muscle movement.

    c. Maintains muscle tone

    d. balance

The Brain

  • Brain Stem a. Base of the brain.

    b. Connects brain to spinal cord.

Parts of the Brain Stem

1. Midbrain

2. Pons

  • Medulla a. Involuntary muscles

    b. Heart beat

    c. Breathing

    d. Blood pressure

    e. Coughing and swallowing.

Parts of the Brain

4. Spinal Cord Extension of the brain stem.

Carries impulses from all parts of

the body to the brain and back.

Peripheral Nervous System

  • 12 pairs of nerves from brain—cranial nerves

  • 31 pairs of nerves from your spinal cord—spinal nerves. Bundle of sensory and motor neurons bound together by connective tissue.

Peripheral Nervous System


1. controls voluntary


2. cranial & spinal

nerves that go

from the central

nervous system to

the skeletal



Involuntary Actions:

heart rate



  • An involuntary, automatic response to a stimulus.

  • Controlled by spinal cord not brain.

  • You can’t control

Drugs and the Nervous System

  • Depressants

    Slows the body’s activities

  • Stimulant

    Speeds up activities of the central nervous



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