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