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ID:36596827
大小:527.00 KB
页数:50页
时间:2019-05-09
《(经管营销)No 22 - 辽宁医学院》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、No.22Spinalcord(2)Brainstem(1)Ⅱ.InternalStructureIntransversesection,thespinalcordisseentoconsistofthegraymatterandthewhitematter.Thegraymatterofthespinalcordiscentrallylocatedandissurroundedbythewhitematter.Ⅰ)GrayMatterThegraymatterformsabutterfly-shapedcoreofthespinalcord,roughlyinthefo
2、rmofaletterH.Thetransversebarofgraymatterthatconnectsthetwolateralgrayareasisthegraycommissure.Withinthegraycommissureisthenarrow,fluid-filledcentralcanal,whichiscontinuouswiththefourthventricle.Theanteriorandposteriortothegraymatterarerespectivelyanteriorgraycommissureandposteriorgraycom
3、missure.Theanteriorandposteriorgraycommissuresarealsocalledcentralgray.TheverticalbarsofthegrayH,oneithersideofthegraycommissure,areseparatedinto:apairofposteriorhorns(columns),apairofanteriorhorns(columns).Inthethoracicandupperlumbar(L1-3)regions,thespinalcordalsohasapairoflateralhorns(c
4、olumns).Thearealocatedbetweentheanteriorandposteriorhornsistheintermediatezone.Thegraymatterofthespinalcordcontainsanenormousnumberofneuronsofvaryingsizeandshape.Rexedlaminastructureofgraymatterofspinalcord.1.LaminaⅠItisalsocalledmarginallayerorWalderyerlayer.Thenucleusposteromarginalisis
5、inthislamina,formingathinlayerofcellscoveringthetipoftheposteriorhorn.2.LaminaⅡItisalsonamedthesubstantiagelatinosaanteriortomarginalareaandisthecorrelationbetweenthespinalsegments.3.LaminaⅢ4.LaminaⅣInlaminaⅢandⅣ,therearelargercellgroups—nucleusproprius.Theyreceivethenumerousafferentfiber
6、sfromposteriorroot.Fibersfromthenucleusproprius,crossesintheanteriorwhitecommisureandcontributetothespinothalamictract.5.LaminaⅤItisequivalenttotheneckofposteriorhorn.Ithasreticularnucleus.6.LaminaⅥItliesthebasepartofposteriorhorn.LaminaⅤandⅥreceivetheafferentfibersofpropersensationfromth
7、eposteriorroots.7.LaminaⅦItoccupiesthegreatpartoftheintermediatezone.1)Thenucleusthoracicus(nucleusdorsalisofClarke)issituatedinthemedialportionofthebaseofposteriorhorn.ItiswelldefinedinthesegmentsofC8—L3.Theaxonscontributefiberstotheposteriorspinocerebellartractsof
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