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The Nervous System is Very Important
Our nerves send messages to everywhere in our body from the brain!
The two main parts of the nervous system include the brain and the spinal cord.
The human brain is considered “mission control” for the nervous system.
… composed of both central, brain and spinal cord, & peripheral components w/the latter having both somatic & autonomic, parasympathetic & sympathetic, subdivisions …
… consider the central nervous system … its major purpose is to receive, process, interpret, & send out information … the brain is composed of inter-related specialized areas of function that are carefully coordinated through a network of connections …
The Divisions of theNervous System
The Divisions include:
The Central Nervous System
The Peripheral Nervous System
The Somatic Nervous System
The Autonomic Nervous System
The Sympathetic Nervous System
The Parasympathetic Nervous System
Our nervous system monitors and controls just
about every organ system. It’s
done through a series of positive
& negative feedback loops.
CNS
CNS is the Central Nervous System
It is composed of the brain & the spinal cord
The CNS is surrounded by bone-skull & vertebrae
Most of the sensory input that is carried into the PNS remains below the level of conscious awareness
The input that does reach the conscious level contributes to perception of our external environment
2 Main Components of the
PNS:
Sensory Pathways, afferent, that provide input from the body in the CNS
Motor Pathways, efferent, that carry signals to muscles and glands - effectors
The Peripheral Nervous System contains
nerves & it connects the brain & the spinal cord,
which is CNS, to the rest of
the body
SNS•SNS = The
Somatic Nervous System
• it includes all nerves that control the muscular system & external sensory receptors
• the motor neurons of the SNS are different from the neurons in ANS
• inhibitory signals can’t be sent through the motor neurons of the somatic nervous system
ANS ANS = Autonomic Nervous System
ANS is that part of PNS consisting of motor neurons that control our internal organs
It has 2 subsystems It controls muscles in the
heart & the smooth muscle in internal organs including the intestine, bladder, & uterus
Motor neurons in ANS don’t reach their targets directly, as do those in the somatic system, but rather connect to a secondary motor neuron, which in turn innervates the target organ
Sympathetic & Parasympathetic
The Sympathetic Nervous System is involved in the fight, or flight response.
The Parasympathetic Nervous System is involved in relaxation.
Diseases / Disordersfrom Ivy Rose
Term Definition Cause Effect
MultipleSclerosis
chronic disease of the nervous system that can affect young or middle-aged adults usually involves recurrent relapses followed by remissions, but some patients experience a chronic progressive course
the myelin sheaths surrounding the nerves in the brain & spinal cord are damaged, which affects the function of the nerves involved
different parts of the brain & spinal cord; usually resulting in scattered symptoms
CerebralPalsy
non-progressive disorder of movement
attributed to damage to the brain, generally occurring before, during, or immediately after birth.
spastic paralysis - sensation is often affected, leading to a lack of balance, & intelligence, posture & speech are frequently impaired
Parkinson's
Disease
degenerative disease process that affects the basal ganglia of the brain
a deficiency of the neurotransmitter dopamine also associated with aging
tremor, rigidity & poverty of spontaneous movements
Sciatica common condition arising from compression of, or damage to, a nerve or nerve root
normally caused by degeneration of an intervertebral disc, which protrudes laterally to compress a lower lumbar or an upper sacral spinal nerve root
pain felt down the back & outer side of the thigh, leg, and foot back is stiff & painful there may be numbness & weakness in the leg
Many drugs affect the central nervous system AND how it worksMany "recreational drugs" can alter the user's consciousness
Risks Include: loss of motor control judgment being altered incorrectly produced
illegal drugs that can include dangerous substances such as talc, poisons, herbicides or other particles, which don't dissolve in the bloodstream that may block blood flow
dull all senses
Drinking can lead to:• clumsiness• un-coordination• very emotional• double vision• nausea• loss of balance• vomiting• unconsciousness• memory loss• etc.
…Drinking disrupts the nervous system's reaction times & it can make us act in an appropriate manner b/c nerve impulses take longer to travel to the brain.
Alcohol is a nervous system depressant … A unit contains 8 grams of alcohol & consists of 1 large
beer, 1 glass of wine, or 1 pub measure of spirits …
Without a Nervous System
HyperlinksThe Visual Dictionary
Ivy Rose Holistic
The Sympathetic Nervous System
Here are few sites that were used for research
in this media presentation.
…just click on what you
would like to view; otherwise known as the
hyperlink…
hyperlink = a selectable element in an electronic document that you click on that serves as an
access point to another electronic resource
Creative Directors:Creative Directors:Chanel ClarkChanel ClarkKiara CrooksKiara Crooks
Lauren QuadeLauren Quade
Research Production Supervisors:Research Production Supervisors:Kiara CrooksKiara Crooks
Lauren QuadeLauren Quade
PowerPoint Media Administration Manager:PowerPoint Media Administration Manager:Chanel ClarkChanel Clark
Sponsor:Sponsor:Kepshire Inc.Kepshire Inc.
And thank you to all of our viewersAnd thank you to all of our viewers
