The Nervous System Central Nervous System (CNS) Peripheral Nervous System (PNS)
PNS PERIPHERAL NERVOUS SYSTEM
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Transcript of PNS PERIPHERAL NERVOUS SYSTEM
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PNS PERIPHERAL
NERVOUS SYSTEM
Pages 433-4351. VOLUNTARY PNS2. INVOLUNTARY PNS
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Voluntary PNSmade up of voluntary
SOMATIC nerves- a.k.a. voluntary SENSORY & MOTOR neurons
under CONSCIOUS control
how you relate with the EXTERNAL environment
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Involuntary PNS also called the Autonomic Nervous System
(the ANS) made up of autonomic (“automatic”)
nerves to your internal glands & organs (heart, lung, liver, etc.)
Unconcious divided into the:
1. SYMPATHETIC NERVOUS SYSTEM=stress system! “fight or flight”!=adrenaline!
2. PARASYMPATHETIC NERVOUS SYSTEM=think PARAmedic keeping you normal / at homeostasis=“rest & digest”
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PNS: SENSORY RECEPTORS
highly modified structures on the dendrites of sensory neurons
Examples skin receptors: pain, temp., pressure, etc.
(see handout) nose (called olfactory receptors) tongue (“tastebuds”) *eyes: photoreceptors *ears: hearing & balance receptors