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 the Nervous 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 Componen ts 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 AANS = Autonomic Nervous System AANS is that part of PNS consisting of motor neurons that control our internal organs IIt has 2 subsystems IIt controls muscles in the heart & the smooth muscle in internal organs including the intestine, bladder, & uterus M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 / Disorders from Ivy Rose from Ivy Rose TermDefinitionCauseEffect Multiple Sclerosis  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 Cerebral Palsy  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 works Many "recreational drugs" can alter the user's consciousness Risks Include: lloss of motor control jjudgment being altered i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 d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

Hyperlinks The Visual Dictionary Google 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

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