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CNS CHARACTERISTICSEncased in bone, surrounded by
cerebrospinal fluidBrain receives/sends information
Encased in craniumSpinal cord made up of spinal nerves
nerve impulses & spinal reflexesEncased in vertebra
TYPES OF TISSUE IN CNSWhite matter
Myelinated nerve fibers & nerve tractsGray matter
Interneurons that pass information to skeletal muscle
PNS CHARACTERISTICSSensory and somatic nervous cellsSends and receives information from CNSConsists of the nerves and ganglia outside
the brain and spinal cord
Autonomic Nervous SystemPart of the PNSLocated in medulla oblangataControl visceral functionsThree parts
Parasympathetic NSSympathetic NSIntrinsic NS
SOMATIC NERVOUS SYSTEMMotor and sensory informationVoluntary control of body movement
Skeletal muscle
Sympathetic vs. Parasympathetic
Sympathetic (thoracolumbar Division)
Parasympathetic (Craniosacral Division)
Prepares the body for energy-expending, stressful, or emergency situations.
Increases Heart and Breathing Rates
Responsible for vasomotor tone
More active under ordinary and restful situations
Restores the body to resting state
Sympathetic Vs. Parasympathetic (Organs) Sympathetic Parasympathetic
EyesHeartLungsBlood VesselsSweat GlandsDigestive TractKidney
Cardiac Muscle (Frequency of contraction)
Digestive System (Salivary Glands)
Respiratory System: (Blood Vessels, Lymphatic Vessels, and Nerves)
SympatheticPreganglionic fibers Secrete acetylcholine (adrenergic)Originate from neurons within the lateral
horn of spinal cordWhat is Ganglia?:
Sympathetic chain ganglia:(Paravertebral ganglia or Lateral Ganglia) lies on both sides of the vertebral column
Collateral ganglia: (Prevertebral ganglia) anterior to vertebral column
Sympathetic Continued….Postganglionic FibersExtend sympathetic ganglia to visceral
Postganglionic Axons
What is Rami? Rami: (Ramus)
Def: A branch, as of nerve, vein, artery
Symapthetic Division (consists 2)
White Rami:(preganglionic) nerve branch between symapthetic ganglion and spinal nerve
Gray Rami: (postganglionic) connects sympathetic trunk and consists postganglionic fibers
ParasympatheticIncludes Parasympathetic FibersPregangolic Fibers (Long)Secrete acetylcholine (cholinergic)Arise from Neurons
Terminal Ganglia
Parasympathetic Continued….Postgangolic Fibers (Short)Continue from ganglia to specific muscles
or glandsUnmyelinatedNeurotransmitters combine receptors
Neurotransmitters / Receptors (Sympathetic vs.
Parasympathetic)
Sympathetic:Norepinephrine :travels
across the synaptic cleftAdrenergic (receptor)
Alpha 1&2Beta 1&2
Epinephrine: stimulatesParasympathetic:Acetylcholine (ACh) :
Cholinergic (receptor)NicotinicMuscarinic
REFLEX ARCSPathways for impulses
Autonomic Nervous System operates through reflex arcs.
Visceral Sensory System.Gives sensory input to ANS.Visceral sensory neurons.
monitor temperature, pain, irritation, chemical changes, and stretch in the visceral organs.
VISCERAL REFLEX ARCSVisceral sensory
and Autonomic neurons
spinal reflexes.Some involve
peripheral neurons: spinal cord not involved.
adjust the activity of a visceral effector, often unconsciously.
TerminationTerminating actions of autonomic
neurotransmitters Acetylcholinesterase (parasympathetic) Norepinephrine (Sympathetic)
●Enzyme monoamine oxidase inactivates noreoinephrine
WORKS CITED "What Is the Autonomic Nervous System?" About.com
Psychology. N.p., n.d. Web. 19 Mar. 2014.<http://psychology.about.com/od/aindex/g/autonomic-nervous- system.htm>
"Peripheral Nervous System Anatomy ." Peripheral Nervous System Anatomy. N.p., n.d. Web. 18 Mar.
2014. <http://emedicine.medscape.com/article/1948687-overview>
THE AUTONOMIC NERVOUS SYSTEM. O.W. Henson, Jr., Ph.D., n.d. Web. 16 Mar. 2014. <http://www.csus.edu/indiv/l/lancasterw/bio122/supplementary%20materials/autonomic%20synopsis.htm>.
Hole, John W., Jr. Hole's Human Anatomy & Physiology. 11th ed. New York: McGraw Hill, 2007. Print.
Inkling.com. N.p., 2009. Web. 13 Mar. 2014. <https://www.inkling.com/read/medical-sciences-naish-revest-syndercombe-1st/chapter-4/neurotransmitters-and-
receptors>.