興奮性突觸 excitatory synapse 把突觸前(presynaptic)的興奮向突觸后(postsynaptic)傳遞的突觸,是抑制性突觸的反義詞。即突觸前纖維末端的動(dòng)作電位一旦到達(dá),興奮性突觸以化學(xué)傳遞,魚類和甲殼類通過(guò)傳的電遞方式向突觸后神經(jīng)元傳遞,而產(chǎn)生興奮性突觸后電位。興奮性突觸后電位是去極化性質(zhì)的電位變化,可因多次興奮性突觸的活動(dòng)而發(fā)生的總和,在超過(guò)閾值時(shí),即產(chǎn)生動(dòng)作電位。