Anatomy- Nervous System.pdf - Nervous System ANATOMY AND...

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Trans # 1Group # 1: Surname, Surname, Surname | STH: Surname | TH: Surname1 of 12Nervous SystemANATOMY AND PHYSIOLOGY27 August 2019 / Prof. James RabagoI. FUNCTIONS OF THE NERVOUS SYSTEMA.OVERVIEWNervous SystemInvolved in some way in nearly every body functionConsidered as a communication functionReceiving signals from and sending commands to differentareas of the bodyCommunication of the nervous system helps to coordinate thebody functions to maintain homeostasisB.FUNCTIONSMajor Functions of the Nervous System (RICME)Receiving Sensory InputSensory receptors monitor external and internalstimuliWe are aware sensations of vision, hearing, taste,smell, touch, pain, body position and temperaturebecause of the stimuliAtsubconscious levelblood pH, blood gases andblood pressure are processedIntegrating informationMajor organsBrainSpinal cordOrgans process sensory input and initiatingresponsesInput may produce an immediate response bestored as memory or ignoredControlling muscles and glandsSkeletalmusclesnormallycontractwhenstimulated by nervous systemThus, by controlling skeletal muscle, nervoussystem controls major movements of the bodyNervous system also participates in controllingcardiac muscle, smooth muscle and many glandsMaintaining homeostasisNervous system’s ability to detect, interpret andrespond to changes in internal and externalconditionsSystem can stimulate or inhibit the activities ofother systems to help maintain a constantinternal environmentEstablishing and Maintaining Mental ActivityBrain is center of mental activityincluding consciousness, memory and thinkingII. DIVISIONS OF THE NERVOUS SYSTEMNervous SystemDivided into Major divisionsCentral nervous systemBrainSpinal cordPeripheral nervous systemAll nervous tissue outside the central nervoussystem (nerves and ganglia)oFunctions to link CNS with various partsof the bodyoCarries information about the differenttissues of the body to the CNS and carriescommands from the CNS that alter bodyactivities-70mv, -90 would represent hyper-polarizationand +30 is the action potential.Sensory Division of PNSAlso known as afferent (toward) divisionConducts action potentials from sensory receptors tothe CNSSensory NeuronsNeurons that transmit action potentials from theperiphery to the CNSMotor NeuronsNeurons that transmit action potentials from the CNStoward the peripheryMotor Divisions of PNSEfferent (away) divisionConducts action potentials from CNS to effector organssuch asmuscles and glandsCan be subdivided by type of effector being innervatedSomatic(bodily) nervous systemAutonomic (self-governing) nervous systemoTransmits action potentials from theCNS to cardiac muscle, smooth muscleand glandsoDivided onto divisionsSympathetic divisionParasympathetic division

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