The results on the generation of the polysynaptic second component suggest that the recurrent excitatory inputs are therefore better developed in the cas region than in the ca1 region of the rats pll - 21 上述多突触第二种成分产生的实验结果提示，在生后1121天的大鼠，回返性兴奋性传入在ca3区的发育要多于ca区。
2.
Distinct outward fpsc following the inward fpsc emerged in neurons ^ pll and was abolished by bicuculline ( 50 um ) . bicuculline increased the amplitude and duration of the initial inward fpsc in all age groups and characteristically recruited the polysynaptic second component of fepscs in neurons p11 - p21 . no spontaneous periodic inward current was detected in any age groups after blocking gabaa receptors 在生后11天以上的神经元，内向电流之后出现了明显的外向电流，此外向电流可被gaba受体阻断剂荷包牡丹碱（ 50pm ）完全阻断，同时iscs的初始内向电流的幅值和时程均明显增加，并且在阻断gaba受体之后，任一年龄组均未观察到自发性周期性的内向电流。
3.
The concomitant application of dl - 2 - amino - 5 - phosphonopentanoic acid ( aps , 100 jim ) with bicuculline did not eliminate the polysynaptic second component , but the second component was only elicited in slices in which the ca3 region was kept intact . moreover , the bicuculline - and ap5 - resistant second component was due to the burst activity of ca3 pyramidal neurons , which were antidromically excited by the stimulation of the schaffer collaterals 在生后1121天，神经元的快兴奋性突触后电流（ fstexcitatorypostsynapticcllntntsfepscs ）出现了典型的多突触第二种成分，同时给予nmda受体阻断剂aps不能消除此多突触第二种成分，但其只有在ca3区保持完整的脑片上才可被引出。
