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1、取活組織需要玻璃分針,止血鉗和冰袋,組織剪。取的時(shí)候先斷頭,從枕骨大孔往前剪開顱骨,完全暴露腦組織,用玻璃分針分離腦組織和顱骨。分離下來的全腦組織置于冰袋上,用玻璃分針從后往上揎起端腦,即可看見海馬,左右各一,之間有組織相連,分離的時(shí)候要輕柔,盡量避免破壞組織結(jié)構(gòu)。分離下來的組織根據(jù)試驗(yàn)安排做后續(xù)處理.step1:Thisisadorsalviewofamouse’sskull,inordertoaccessthebrainyoucancutalongthecoronalsutureandsagittalsuturethenpulloffbothsidesofpar
2、ietalboneandinterparietalbone.這是大鼠頭部背面觀,為了接觸到腦,需沿冠狀縫和矢狀縫切開,然后把頂骨和枕間骨取下。step2:Nowtheskullisopenandyoucanseethebrainclearly,inordertogetthehippocampusyou’dbetterkeepthebraininthecranialcavitysothebrainwillnotmovewhenyoucontinuewiththefollowingsteps現(xiàn)在頭蓋骨被打開,你可以清楚地看到大腦,但為了獲得海馬你最好把大腦保持在顱腔內(nèi),
3、這樣在你進(jìn)行下列操作時(shí)大腦就不會(huì)移動(dòng)。step3:Inordertoexposethehippocampusyouneedtoremovethecerebralcortexcoveringit.Thefirstincisionisattheendofthehemisphere;theincisionshouldbeabout0.7mmdeepformostadultmousethatyoumightnothurtthehippocampuswhiletoexposeit.The2ndincisionisabout1.5-2mminfrontofthefirstone
4、,thisincisionyouneedcutintothelateralventricle,bothoftheincisionsgototheventralofthebrainandmeetthere.Nowthispieceofcortexisfree,pullitup,youwillseethehippocampusjustlikeinthispicture,alsoyoucanseetheCSFintheopenedventricle為了看到海馬你需要移動(dòng)覆于其上的大腦皮層。第一個(gè)切口在半球的末端,對大多數(shù)成年大鼠來說,此切口應(yīng)約0.7mm深,這樣才能保證不
5、傷害到海馬。第二個(gè)切口在第一個(gè)切口前方約1.5-2mm處,此切口需要切入到側(cè)腦室,兩個(gè)切口在大腦腹側(cè)銜接?,F(xiàn)在這塊大腦皮層就是游離的了,把它取下來,你就可以看到如圖所示的海馬,你也可以看到打開的腦室內(nèi)的CSF(腦脊液)。step4:Keepworkingontheothersideofthebrainpullupbothsidesofthecortexthatcoveringthehippocampusalongtheventricle.Nowyoucanseethedorsalpartofthehippocampus.Separatetherestofthehip
6、pocampusfromthecortexcoveringitalongthesurfaceofthehippocampustowardstheventralpartofthehippocampus繼續(xù)沿腦室把覆蓋在海馬上面的兩邊皮層揭下。現(xiàn)在你能看到海馬的背部。把余下的部分沿著海馬的表面直到海馬的腹部部分從覆與其上的大腦皮層中分離出來.step5:Keepworkingontheothersideofthebrainpullupbothsidesofthecortexthatcoveringthehippocampusalongtheventricle.Nowyo
7、ucanseethedorsalpartofthehippocampus.Separatetherestofthehippocampusfromthecortexcoveringitalongthesurfaceofthehippocampustowardstheventralpartofthehippocampus.step6:Nowyouneedtofreethehippocampusfromthesurroundingtissue現(xiàn)在需要從其周圍的組織中把海馬分離出來.step7:Hereisthehippocampuspickedoutfromthebr