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6.Nervous System - The Nervous System: A Living Information...

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The Nervous System: A LivingInformation HighwayLIFS 1902General Biology IIChapter 17
CommunicationComputerNervous system=
The nervous systemto thinkmaintainhomeostasisto move
to feel emotions
The nervous systemNeuroscienceis a very exciting area of researchIt is any scientific research that deals with thenervous system andthe brain.AT HKUST there is strong research in this area.e.g. research on Alzheimer's disease (腦腦腦腦)
Nervous TissueThe Nervous SystemTwo Anatomical DivisionsCentralNervousSystem (CNS)Brain and Spinal CordPeripheralNervousSystem (PNS)Consists of nerves(bundles of axons) and glia (ganglion) cellsoutside the CNSTwoTypes of CellsNeurons (nerve cells)Transmit nerve impulses (electrical currents)Glia (glial cells) “nerve glue”Depending on the type may nourish neurons, insulate theaxons of neurons or help maintain homeostasis of theextracellular fluid surrounding neurons
Central Nervous System (CNS)Function: Controls most functionsof the body and mind.The braincontrols thoughtsInterprets our externalenvironmentcontrols body movementThe spinal cordhighway for communicationbetween the body and the brain
Disorders of the Spinal CordDisorders of the Spinal CordSpinal cord injuries may stop impulses from travelingalong neurons in the spinal cord.This can result in paralysis of the areas located below thesite of injuryTwo vertebrae in his neck were fractured,affecting nervous control of respiration-QUADRAPLEGIAChristopher Reeve-Superman
Peripheral Nervous System31 pairs of spinalnerves connect spinalcord to the rest of bodyPNS carriesinformation in the formof nerve impulsesfromyour CNSto the restof your bodyand from your body(muscles and glands)to your CNS.
Neuron StructureThree Parts of a NeuronDendritesShort extensions thatRECEIVEsignals from otherneurons and send to the cell bodyCell BodyContains theNUCLEUSand other organellesAxonConducts nerve impulses away from the cell bodytoward other neurons or effectors
cell bodydendritesMotor neuron(effector neuron)node ofRanvierdirection ofconductionaxonnucleus ofSchwann cell(glial cell)effector(muscle)Structure of a neuronMyelin sheathNucleusLess than2mm in lengthAxonCollectelectricalsignalDendritesCell bodyIntegrates incoming signalsand generates outgoing signalto axonPasses electrical signals to dendritesofanother cell or to an effector cellmetaboliccentre
Neuron StructureAxons are differentlengthsThe axon from thespinal cord to musclecells in the foot canbe over 1 m long
Cell body of the neuronContains the nucleus and many other organelles

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Term
Fall
Professor
DavidBanfield
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