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1、NervousTissueFunction:receivestimuli,transmitnerveimpulsesnervecell---neuronCompositionneurogliaNeuron:structural&functionalunitofNTNeuroglia:supporting,protection,nutritionI.NeuronFunction:receivestimuli,transmitnerveimpulses（activeinmetabolism）cellbodyStructuredendritea
2、xon1.Cellbody(soma)trophiccenter,receptivetostimuli(1)Nucleus:large,round,pale,prominentnucleolus---likeanowl’seye(2)Perikaryon:richinRER,ribosome,Golgicomplex,microtubule,neurofilament.Nisslbody:RER&freeribosomeappearasbasophilicgranularareasunderLMNeurofibril:clumpsofne
3、uro-filamentsµtubulesbevisualizedunderLM(stainedwithsilver),playaroleintransportation,supportingandshapemaintaining.2.Dendrites*Treelikeprocessesforreceivingstimuli.*Theircytoplasmcompositionissimilartothatoftheperikaryon.*Thereareoftenalargenumberofthornyspines(dend
4、riticspine)coveringthedendrite.Theseprojectionsarethesitesofcellcontact.3.Axon:Usuallyoneneuron-onlyoneaxon,longerandthinnerthandendrite.Axonarisefromcellbodyorstemofamajordendritenearsoma.Theregionwheretheaxonarisefromisnamedaxonhillock.TherearenoNisslbodiesinaxonandaxon
5、hillock.Function:conductnerveimpulsestothenextcell.Axolemma---cellmembraneofaxonAxoplasm---cytoplasmofaxonAxonaltransport---axoplasmflowanterogradetransportretrogradetransporttracingtechnique,labelledmarkerProcessesDendritesaxononeormorethanoneonebranched,shorter,longer,t
6、hinnerdendriticspineaxonhillockcontainNisslbodynoNisslbodyafferentefferent4.SynapseAhighlyspecializedcelljunctionbetweenneuronsorneuronandeffectorcell.(1)Chemicalsynapse:presynapticelement:synapticvesicles(neurotransmitter)synapticcleft:20~30nmpostsynapticelement:receptor
7、Function:passinformationfromonecelltoanotherbyreleasingneurotransmitters.Nerveimpulse---axonterminal---电位门控通道开放---Ca2+内流---synapticvesiclestowardpresynapticmembrane---胞吐releasingneurotransmitter---intocleft---receptorinpost.membrane---化学门控通道开放---post.membrane动作电位---excita
8、tionorinhibition兴奋或抑制(2)Electricalsynapse---gapjunction5.Classification:accordingtothenumberofpr
