The Peripheral Nervous System

The P.N.S.

Peripheral Nervous System• Somatic Nervous System (___)

– ________________________________– Motor nerves – Messages between brain and body

- ________________________________• Autonomic Nervous System _( )

– ________________________________

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Peripheral Nervous System• _____________________

__________________________________________; the axons carry the messages from one nerve to the next.

• The PNS is made up:- _____________________ Found in the Skull

- _____________________ Found in the Spinal Cord.

Spinal NervesSpinal Nerves carry: Spinal Nerves carry: - _______________________- _______________________- sensory (touch), and - sensory (touch), and - _______________________ _______________________ signals between the spinal cord signals between the spinal cord and the body.and the body.

Cranial Nerves• Cranial nerves

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• They are “wired directly to the brain.

• _____________________________________________

Types of NervesSensory nerves______________________________________

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Motor nerves:______________________________________

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Motor vs. Sensory Nerves

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Motor Neurons carry messages Motor Neurons carry messages concerning voluntary movements from concerning voluntary movements from the brain to the muscles.the brain to the muscles.

Motor nerve:Motor nerve:

StartsStarts: ___________ : ___________

EndsEnds:_____________:_____________

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The Sensory Nerves relay to the brain The Sensory Nerves relay to the brain information that originates OUTSIDE the information that originates OUTSIDE the body and is registered by the five sensesbody and is registered by the five senses..

Sensory nerve:Sensory nerve:StartStart: ________________________Ends:Ends: ____________ ____________

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You accidentally touch the burnerYou accidentally touch the burneron your stove at home….on your stove at home….

What happens?What happens?

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HOW DOES THIS HAPPEN?HOW DOES THIS HAPPEN?

REFLEX RESPONSEREFLEX RESPONSE

Reflex Response1) The touch receptors in your hand _______________

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2) BUT this nerve impulse doesn’t get sent to the brain. WHY?

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3) Instead, a nerve impulse is commanded from the spinal cord to the hand muscles, telling them to draw away.

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Consequences of Damage to Nerve Cells

A. The nerve does not ___________________

B. The transmission of impulses may _______ ______________________________________________________________________

C. Interpretation of the impulse may be

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Review Questions- PNS1) What are the 2 divisions of the peripheral nervous system and

how are the different?

2) What is a nerve?

3) What two types of nerves exist and what are 2 differences between them?

?

4) What 3 types of neurons are involved in reflex responses and in what order do nerve impulses travel through them?

5) What is the difference between a voluntary movement such as walking and an involuntary movement such as a reflex response?

6) What could are consequences of nerve damage?