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Download The Peripheral Nervous System The P.N.S.
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Transcript
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 ________________ ________________ ________________ _____________ _____________ _____________ _____________ _____________ _____________ _________________ _________________ _________________ _________________ _________________ _____________ _____________ _____________ _____________ ??? 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?
