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NervousTissue1.Neuron
2.Synapse
3.Neuroglia
4.Nervefiber&nerve
5.Peripheralnerveendings
6.Ganglia
7.Brainbloodbarriernervecell=neuron



neuroglialcell
nervecell=neuron



neuroglialcell1.neuron(1)Cellbody(soma)(1)Cellbody(soma,perikaryon)bipolarneuron
(myentericplexus,silverstaining)multipolarneuron(HE)LM:Nisslbody
(Nisslstaining)Nisslbody=rER＋FR

Neurofibril=neurofilament＋microtubule①dendrite:
①dendrite:
---similarstructuretocellbody
---richindendritespines
---receiveimpulseStructuresrelatedtoaxonaxonhillock
---pyramid-shapedregion
---axonoriginatesfromhere
---noNisslbody
initialsegmentofaxon

myelinatedaxon
---coveredbymyelinsheath
unmyelinatedaxonAxonaltransportanterograde~
retrograde~



slow~:0.1-2mm/d
rapid~:100-400mm/d---bipolar～
---pseudounipolar～
---multipolar～2.Synapse***2.Synapse2.Synapse2.Synapse2.Synapse2.Synapse26multipolarneuron
---dendrites
---axon
---axonhillock
---Nisslbody/neurofibril
axonaltransport
synapse
---presynapticvesicles
---neurotransmitters
---postsynapticreceptors3.NeurogliaAstrocyteAstrocyteAstrocyteOligodendrocyteOligodendrocyteMicrogliaMicrogliaEpendymalcell(2)glialcellsinPNSSchwanncell
---formingmyelinsheath
---secreteneurotrophicfactor

satellite(capsular)cell
---surroundneuronsinganglionSummary4.Nervefiber&nerve4.Nervefiber&nerve4.Nervefiber&nerveI.myelinatednervefibersRanviernode
---gapbetween2adjacentSchwanncells
---nudeaxolemma/nakedaxon
---saltatoryimpulseconduction(fast)Ranviernode

internode
---segmentbetweenadjacentnodes
Ranviernode

internode

Schmidt－Lantermanncleft
---SchwanncytoplasmEM:
---runway-likesheath+axon
---formedbymembraneofSchwanncell/oligodendrocyteformationofmyelin:
---axoninvaginatesSchwanncell
---fusedmembrane=mesaxon
formationofmyelin:
---axoninvaginatesSchwanncell
---fusedmembrane=mesaxon
---mesaxonelongatesandmakesturnsaroundaxon
---lipidsaredepositedbetweenlayersofmesaxonsII.unmyelinatednervefiberIII.degeneration&regenerationofneuronsaxoninjurydegeneration
---distal:anterograde(Wallerian)~
---proxim