两栖类峡核的顶盖外投射

用辣根过氧化物酶法研究了中华大蟾蜍峡核的顶盖外投射。结果指出：（１）中脑脚盖前背核、中脑深核和表层峡网核投向双侧峡核，对侧投射经过Ｖｅｌｉ交叉；（２）这些脚盖核投向整个峡核，其间没有区域对应关系。讨论了这些投射的可能功能意义。

家鸽峡核顶盖通路的神经传递

采用微量离子电泳的方法研究了家鸽峡核顶盖的神经传递。电刺激峡核小细胞部（Ｉｐｃ）主要诱发顶盖细胞的抑制性反应（Ⅰ－型），也有少量兴奋－抑制型反应（ＥＩ－型），兴奋性反应以乙酰胆碱为递质，抑制性反应则以ＧＡＢＡ为递质。据推测，Ｉｐｃ可能通过直接的神经投射调制顶盖细胞的活动。

家鸽顶盖细胞的突触后电位和形态特征

本文采用细胞内记录技术,研究了86个家鸽顶盖细胞对电刺激视束和峡核小细胞部(Ipc)反应的突触后电位,并用荧光黄(LY)标记了13个记录细胞,根据突触后电位的类型和出现顺序,反应可分为4种类型:兴奋性突触后电位(EPSP)-抑制性突触后电位(IPSP)序列(EI型),E型,I型和IE型,电刺激视束主要产生E或EI型反应,而半数以上细胞对电刺激Ipc产生I型反应。在LY标记的顶盖细胞中,有5个神经节细胞,4个锥体细胞,2个双极细胞和2个星形细胞,神经节细胞主要分布在顶盖Ⅲ和Ⅳ两层,其它细胞均位于顶盖Ⅱ层,从电记录和荧光标记看来,顶盖细胞的形态特征与其突触后电位类型似有相关性。

Postsynaptic Potentials and Morphological Features of Tectal Cells in Homing Pigeons

In this study postsynaptic potentials responding to the electrical stimulation of the optic nerve and the nucleus isthmipars parvocellularis (Ipc) were intracellularly recorded from 86 tectal cells in pigeons, 13 of which were marked with Lucifer yellow (LY). According to types of postsynaptic potentials and their succesion, the postsynaptic responses could be classified into four types: excitatory postsynaptic potential (EPSP)-inhibitory postsynaptic potential (IPSP) sequence (EI type), E, I and IE types.Among them, E or EI responses were mainly produced to the optic nerve stimulation, while the electrical stimulation of the lpc elicited I responses in more than half the recorded cells.LY-marked tectal cells included five ganglionic cells, four pyramidal cells, two bipolar cells and two stellate cells.The ganglionic cells were mainly located in tectal layers Ⅲ and Ⅳ, whereas the others were in layer Ⅱ.It appears from both intracellular recordings and fluorescent markings that there is some