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

Nervous System

Tina Remes Walters

2011


Stimulus

Stimulus

Any internal or external changes that brings about a response.

Outside the body: noise

light

temperature

Inside the body: hormones


Homeostasis

Homeostasis

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

Examples: heart beat

digestion


Impulse

Impulse

Message carried by neurons.


Neurons

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

Types of Nerve Cells

  • Sensory Neurons receives information and

    sends impulses to the brain

    and spinal cord. Message

    is then sent to the motor

    neurons.


Types of nerve cells1

Types of Nerve Cells

  • Motor Neurons Impulses from the brain or

    spinal cord to muscles or

    glands.

  • Interneurons Relays messages to motor

    neurons from the sensory

    neurons.


Synapses

Synapses

Space between Neurons


Nervous system1

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

The Brain

  • Coordinates all of your body activities.

  • 100 billion neurons

  • 10% of all neurons in

    the body.


The brain1

The Brain

  • Cerebrum a. Thinking

    b. Largest part of the brain.

    c. Impulses from senses are

    interpreted

    d. Stores memories

    e. Controls movement

    f. Cortex outer layer

    ridges and grooves


The brain2

The Brain

  • Cerebellum a. Stimuli from eyes, ears,

    muscles and tendons are

    interpreted.

    b. Coordinates voluntary

    muscle movement.

    c. Maintains muscle tone

    d. balance


The brain3

The Brain

  • Brain Stem a. Base of the brain.

    b. Connects brain to spinal cord.


Parts of the brain stem

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

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

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 system1

Peripheral Nervous System

Somatic

1. controls voluntary

action

2. cranial & spinal

nerves that go

from the central

nervous system to

the skeletal

muscles

Autonomic

Involuntary Actions:

heart rate

breathing


Reflexes

Reflexes

  • An involuntary, automatic response to a stimulus.

  • Controlled by spinal cord not brain.

  • You can’t control


Drugs and the nervous system

Drugs and the Nervous System

  • Depressants

    Slows the body’s activities

  • Stimulant

    Speeds up activities of the central nervous

    system.

    Caffeine


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