Autonomic NS

Topics: Acetylcholine, Nervous system, Peripheral nervous system Pages: 10 (787 words) Published: October 5, 2013
Autonomic
Nervous System

I. Kevin Johnson, AS,BS, NREMT-P
Paramedic Program
Inver Hills Community College

Nervous System
Central Nervous
System
brain & spinal cord

Peripheral Nervous
System
Cranial and peripheral
nerves
Somatic nervous system
voluntary movement

Autonomic

Central Nervous System
Peripheral Nervous System
Somatic Nervous System

Autonomic Nervous System

Parasympathetic

Sympathetic

Alpha
Receptors

Beta
Receptors

Autonomic Nervous System
Responsible for control of involuntary or
visceral bodily functions
cardiovascular
respiratory
digestive
urinary
reproductive functions
Key role in the bodies response to stress

Automonic Nervous System
Sympathetic nervous system
allow body to function under stress
fight or flight

Parasympathetic nervous system
controls vegatative functions
feed or breed or rest and repose
constant opposition to sympathetic system

Autonomic Nervous System

Major components
Neuron
Sensory - Afferent
Motoneurons - Efferent

Neurotransmitter
chemical substance which travels across a
synaptic junction to act on a target cell.

Effector Organs
specific tissues stimulated by the autonomic
nervous system

Neuron

Sensory

Motoneuron

Neurotransmitters
Autonomic Nervous system
activated by reflex centers located in the brain
and spinal cord

Reflex arc
complete circuit of nerves involved in an
involuntary movement
From the stimuli to the effector organ

Neurotransmitters
Norepinephrine
Post-ganglionic Neurotransmitter for the
sympathetic Nervous system

Acetylcholine
pre-ganglionic Neurotransmitter for both
systems
Post-ganglionic neurotransmitter for the
parasympathetic nervous system

Synapse
Junction of Pre and Post synaptic neurons
Neurotransmitter produced in presynaptic
membrane
Moves across synaptic space
binds with receptor on postsynaptic membrane
causes impulse potential

Synapse
Neurotransmitter
Electric Current

Rejuventated
Electric Current
Postganglionic
Neuron

Preganglionic
Neuron
MAO

Neuroreceptor

Dopamine
Cycle

Neurologic Conduction
Initiation
Sensory bodies initiate impulse
depolarization
Afferent impulse

Conduction
impulse is conducted along neuron to
Synaptic Junction
Neurotransmitter is released

Neurologic Conduction
Synaptic Activity
neurotransmitter is release
crosses synaptic cleft
Stimulates receptors on next neuron
Immediately, neurotransmitter is inactivated by
enzyme (cholinesterase)
Action Potential is intiated along 2nd neuron

impulse travels down efferent neuron to
Effector Gland or muscle

Sympathetic
Thoracolumbar
Conduction takes
place along very short
neurons, effecting
directly on gland or
muscle

Parasympathetic
Vagus Nerve
Main regulator of
Automatic functions
Neuron pathways are
much longer, making
this a slower system

Reflex Arc
Craniosacral
brain to affector organ
parasympathetic nervous system

Thoracolumbar
ganglia are located near the spine
makes for a quicker response
Sympathetic nervous system

Reflex Arc
Reflex Arc
complete
circuit of
nerves involved
in involuntary
movement

Sympathetic Nervous System
norepinephrine stimulates
receptor directly
Thoraco-lumbar
System
Terminal of
postganglionic
Fiber
synaptic junction
ACh released

Sympathetic Stimulation
stimulate sweat glands
constrict peripheral vessels
increase blood to skeletal
muscles
increase chronotropic and
inotropic effects
bronchodilation
stimulation of NRG
production
reduce blood flow to
abdomen
decrease digestive activity
relax smooth muscle in wall
of bladder
release glucose stores from
liver

Adrenal Medulla
This area of the nervous system is also
stimulated by the release of
norepinephrine.
This releases
noradrenalin & adrenalin

These are released into the body to also react
with receptors and prolong the effects of
sympathetic...
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