Transcript The Peripheral Nervous System The P.N.S.

The Peripheral
Nervous
System
The P.N.S.
Peripheral Nervous System
• Somatic Nervous System
(___)
– ________________________________
– Motor nerves
– Messages between brain and body
- ________________________________
• Autonomic Nervous System _(
)
– ________________________________
-_________________________________
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 Nerves
Spinal Nerves carry:
- _______________________
- sensory (touch), and
- _______________________
signals between the spinal cord
and the body.
Cranial Nerves
• Cranial nerves
_________________
_________________
___________
• They are “wired
directly to the brain.
• _________________
_________________
___________
Types of Nerves
Sensory nerves
______________________________________
____________________________________
Motor nerves:
______________________________________
____________________________________
Motor vs. Sensory Nerves
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???
Motor Neurons carry messages
concerning voluntary movements from
the brain to the muscles.
Motor nerve:
Starts: ___________
Ends:_____________
_______________
_______________
_______________
The Sensory Nerves relay to the brain
information that originates OUTSIDE the
body and is registered by the five senses.
Sensory nerve:
Start: ____________
Ends: ____________
_______________
_______________
_______________
You accidentally touch the burner
on your stove at home….
What happens?
________________________________
HOW DOES THIS HAPPEN?
REFLEX RESPONSE
Reflex Response
1) The touch receptors in your hand _______________
__________________________________________
__________________________________________
2) BUT this nerve impulse doesn’t get sent to the brain.
WHY?
__________________________________________
__________________________________________
3) Instead, a nerve impulse is commanded from the spinal
cord to the hand muscles, telling them to draw away.
__________________________________________
__________________________________________
__________________________________________
Consequences of Damage to
Nerve Cells
A. The nerve does not ___________________
B. The transmission of impulses may _______
___________________________________
___________________________________
C. Interpretation of the impulse may be
___________________________________
___________________________________
___________________________________
Review Questions- PNS
1) 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?