09 Anatomy and Physiology 121 The Nervous System.pdf -...

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Anatomy and Physiology 121: The Nervous SystemGeneral Functions of the Nervous SystemTerms and TopicsNeural tissue (neurons and neuroglial cells)Nerves!Nerve impulses (bio-electrochemical)Synapses and neurotransmittersSensory neurons and motor neuronsReceive and respond to stimuliGeneral Divisions of the Nervous SystemCentral Nervous System (brain and spinal cord)Peripheral Nervous System (cranial and spinal nerves)Sensory Division (sensory receptors)Motor Division (effectors)Somatic Nervous System (voluntary)Autonomic Nervous System (involuntary)Structure of a NeuronCell BodyDendrites (cellular processes)Axon (cellular processes)NeurilemmaNodes of RanvierSchwann Cells (peripheral nervous system)Myelin and theMyelin SheathSynaptic cleft (synapses)NeurofibrilsNissl Bodies (chromatophilic substance)Classification of NeuronsStructuralBipolar neuronsUnipolar neuronsMultipolar neurons
FunctionalSensory neuronsInterneuronsMotor neuronsClassification of Neuroglial CellsAstrocytesOligodendrocytes (central nervous system) & Schwann Cells (peripheralnervous system)MicrogliaEpendymaRegeneration of a Nerve FiberIf a cell body is injured, the neuron is likely to dieIf a peripheral nerve is severed, its distal portion may regenerate andreestablish its former connectionsSignificant regeneration is unlikely in the CNSCell Membrane PotentialDistribution of IonsMembrane PotentialResting PotentialLocal Changes and the Threshold PotentialSummation and Action PotentialsRefractory PeriodAll or None ResponseImpulse ConductionSynapsesSynapseSynaptic cleftPresynaptic neuronPostsynaptic neuronNeurotransmitters

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Term
Fall
Professor
Dr. Moore

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