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Nervous System Basics
I. Function
II. Subdivisions
III. Anatomy
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Functions of the Nervous System
1. Sensory Input
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Functions of the Nervous System
1. Sensory Input
2. Integration
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Functions of the Nervous System
1. Sensory Input
2. Integration
3. Motor Output
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Nervous System Basics
I. Function
II. Subdivisions
III. Anatomy
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Nervous system
CNS PNS
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord– Integration Center
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord– Integration Center– Interpret stimuli & cause motor
response
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord– Integration Center– Interpret stimuli & cause motor
responses
• Peripheral Nervous System– Spinal & Cranial Nerves
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord– Integration Center– Interpret stimuli & cause motor
responses
• Peripheral Nervous System– Spinal & Cranial Nerves – Link body to CNS
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Nervous system
CNS PNS
Efferent Afferent
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Subdivisions of the PNS• Sensory (Afferent) Division
– Carry impulse to CNS
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Subdivisions of the PNS• Sensory (Afferent) Division
– Carry impulse to CNS
• Receptor types– Somatic sensory receptors
– Visceral sensory receptors
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Nervous System Organization• Central Nervous System (CNS)
– Brain & Spinal Cord– Integration Center– Interpret stimuli & cause motor
responses
• Peripheral Nervous System– Spinal & Cranial Nerves – Link body to CNS
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Subdivisions of the PNS• Motor (Efferent) Division
– Carry impulse from CNS to the _________ organs
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Subdivisions of the PNS• Motor (Efferent) Division
– Carry impulse from CNS to the _________ organs
• Potential Effects:– Muscle contraction
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Subdivisions of the PNS• Motor (Efferent) Division
– Carry impulse from CNS to the _________ organs
• Potential Effects:– Muscle contraction
– Hormone secretion
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Nervous system
CNS PNS
Efferent Afferent
Somatic Autonomic
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Efferent Subdivisions
• Somatic Nervous System– Motor nerves carrying
impulse to _______ muscle
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Efferent Subdivisions
• Somatic Nervous System– Motor nerves carrying
impulse to _______ muscle
– “Voluntary Nervous System”
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Efferent Subdivisions
• Somatic Nervous System– Motor nerves carrying
impulse to _______ muscle
– “Voluntary Nervous System”
– Conscious control
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Efferent Subdivisions
• Autonomic Nervous System– Motor nerves carrying impulse
to glands, ________ & _______ muscle
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Efferent Subdivisions
• Autonomic Nervous System– Motor nerves carrying impulse
to glands, ________ & _______ muscle
– “Involuntary Nervous System”
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Efferent Subdivisions
• Autonomic Nervous System– Motor nerves carrying impulse
to glands, ________ & _______ muscle
– “Involuntary Nervous System”
– Runs on “Autopilot”
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Efferent Subdivisions
• Autonomic Nervous System– Motor nerves carrying impulse
to glands, ________ & _______ muscle
– “Involuntary Nervous System”
– Runs on “Autopilot”
– Maintains homeostasis
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Nervous system
CNS PNS
Efferent Afferent
Somatic Autonomic
Sympathetic Parasympathetic
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Autonomic Nervous System
• Sympathetic Nervous System– Emergency situations
– “Fight of Flight” response
– Effects on body include:• sweating• scalp “prickling”• increased heart rate• Adrenalin release
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• Parasympathetic– Non-emergency situations
Autonomic NS Subdivisions
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• Parasympathetic– Non-emergency situations
– “Resting and Digesting”
Autonomic NS Subdivisions
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Autonomic NS Subdivisions
• Parasympathetic– Non-emergency situations
– “Resting and Digesting”
– Effects include:• decreased heart rate• increases peristalsis• bladder contraction
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Nervous System Basics
I. Function
II. Subdivisions
III. Anatomy
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1. Neuroglia (“nerve glue”)• Supporting skeleton for nerves
Types of Nervous Tissue
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1. Neuroglia (“nerve glue”)• Supporting skeleton for nerves• Insulate nerves by forming a “myelin
sheath”
Types of Nervous Tissue
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1. Neuroglia (“nerve glue”)• Supporting skeleton for nerves• Insulate nerves by forming a “myelin
sheath”
2. Neuron (nerve cells)• Specialized cells that transmit _________
impulses
Types of Nervous Tissue
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Receive signals from other __________
Dendrites
Axon
Synaptic Terminal
Cell Body
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Contains nucleus and organelles
Dendrites
Axon
Synaptic Terminal
Cell Body
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Generates and transmits the ________potential
Dendrites
Axon
Synaptic Terminal
Cell Body
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Dendrites
Axon
Synaptic Terminal
Cell Body
Sends chemical signalscalled _____________ to adjacent neurons
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Communication Between Neurons
Synapse
Sending Neuron Receiving Neuron
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What is a Nerve?
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What is a Nerve?
Nerve . Bundle
Nerve
Neuron
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Motor root - Carries signal out to organs
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Motor root - Carries signal out to organs
Sensory root – Carries signal in from organs
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Motor root - Carries signal out to organs
Sensory root – Carries signal in from organs
Motor + Sensory Root = Spinal Nerve
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Motor root - Carries signal out to organs
Sensory root – Carries signal in from organs
Motor + Sensory Root = Spinal Nerve
Dura Mater - Tough Protective tissue
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Summary
• Nervous system allows for sensory input, integration, and response to stimuli
• Nervous system can be subdivided based on function and location
• Nerves transmit electrical impulses down an axon