neurophysiology of nerve impulses the nervous...

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Neurophysiology ofNerve Impulses

TheNervousSystem

Function of the Nervous System

sensoryreceptor

sensory input

integration

motor inputeffector

Anatomical Divisionsof the Nervous System

Central Nervous System (CNS)brainspinal cord

Peripheral Nervous System (PNS)cranial nervesspinal nerves

AnatomicalDivisions ofthe Nervous

System

CNS PNSbrain

spinalcord

cranialnerves

spinalnerves

Typical Motor Neuron

cell body

dendrite axon

axoncollateral

musclefibers

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Myelin Sheath

axon

nodes of RanvierSchwann cells

Neuron Interaction&

Integration

sensoryreceptors

sensoryneuron

interneuronmotorneuron effector

Anatomy of a Nerveaxon

myelin sheathendoneurium

fascicleperineurium

blood vesselsepineurium

Resting Potentialof an Axon

Resting Potentialof an Axon

Resting Potential of an Axon

-70 mV

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Depolarizing the Membrane

Depolarizationof the AxonMembrane

ActionPotential

Propagationof the Action

Potential

Stimuli Capable of Elicitingan Action Potential

ElectricalChemical

MechanicalThermal

Neuron-To-NeuronTransmissionsynapses

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Synapse

postsynapticneuron

presynapticneuron

synaptic vesiclescontaining

neurotransmitters

synapse

Synapses

Synapses Neurophysiology Apparatus

Eliciting a Nerve Impulse Inhibiting a Nerve Impulse

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Nerve Conduction Velocity