Divisions of the Human Nervous System

• 1. DIVISIONSof theHUMANNERVOUSSYSTEM

2. Divisions of the Human Nervous SystemAutonomic NervousSystemCerebro-SpinalSystem SympatheticSystem ParasympatheticSystem Central NervousSystem Peripheral NervousSystem 3. Autonomic or SympatheticNervous System acts as a control system functioninglargely below the level of consciousness,and controls visceral functions. many of its activities areautonomous or self-regulating 4. 2 Divisions / Systems of Autonomic NSSympathetic System consists of nerves andganglia acts as a unit; is activein emotion stimulates the body onlyfor using energy involved in the fight orflight response duringemergency situation orin high emotionParasympatheticSystem composed of fibers fromthe cranial region sometimes called restand digest system as itquiets the body andreturns it to a lowerintensity of arousal. It isinvolved in relaxation. Itconserves energy andcontrols sedentary 5. Cerebro-Spinal System The portion of the nervous system comprising thebrain, cranial nerves, spinal cord and the spinalnerves concerned with transmission of impulsesfrom sense organs to the voluntary musclesThe brain and spinal cord is protected by threemeningesDura materArachnoidPia mater 6. Central Nervous SystemThe centralnervous system(CNS) is theprocessingcenter for thenervoussystem. 7. TheBrain-It weighs 3pounds andcontains90% of thebodyneurons-is a highlyspecializedorgan 8. BRAIN AREAS 9. Motor Area 10. Body-sense Area 11. Visual Area 12. Auditory Area 13. Speech Area 14. Smell Area 15. Taste Area 16. Association Areas 17. Spinal CordThe spinalcord is themainpathway forinformationconnectingthe brainandperipheralnervoussystem.