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 EfferentAfferent

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 EfferentAfferent SomaticAutonomic

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 EfferentAfferent SomaticAutonomic 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

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

R eceive 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 signals called _____________ to adjacent neurons

Communication Between Neurons Synapse Sending NeuronReceiving Neuron

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