【摘要】 对猫二叠体旁核与上丘之间的定位联系用逆行性和顺行性 HRP 追踪技术进行了研究。HRP 注射至吻端上丘后,对侧吻端二叠体旁核可见大量标记细胞,核之其余部位标记细胞较少,标记终末则主要分布在同侧二叠体旁核尾侧部,它们呈颗粒或念珠状,浓密地分布在核尾侧部的背腹侧范围内,尤以背侧区密度最高。相反,尾端上丘注射后,HRP 阳性细胞和标记终末主要见于同侧二叠体旁核尾侧部,但标记细胞与终末密度明显降低。我们还注意到注射区仅限于上丘浅层者,二叠体旁核内标记细胞较稀少,未发现标记终末;注射区位于上丘深层者,不仅在两侧二叠体旁核内可见较多标记细胞,而且在同侧二叠体旁核尾侧部还可见到一些标记终末。以上结果表明,二叠体旁核与上丘之间存在往返纤维联系,并有相应的吻—吻端,尾—尾端,以及吻—尾端定位投射关系,即吻端二叠体旁核主要投射至对侧吻端上丘;尾端二叠体旁核一方面投射到同侧上丘尾侧部,另一方面也接受同侧上丘、特别是吻侧上丘的强大输入,而发出纤维至二叠体旁核的母细胞体可能位于同侧上丘较深的板层。更多还原

【Abstract】 The topographical projection between the parabigeminal nucleus and the superiorcolliculus in the cat was investigated by retrograde and anterograde HRP tracingtechnique.Following HRP injection in the rostral superior colliculus,the labeledsomata were found predominantly in the rostral region of contralateral parabigeminalnucleus,but labeled terminals were heavily distributed in the ipsilateral parabigeminalnucleus,mainly in the caudal region.Following injection of HRP into caudal superiorcolliculus,the labeled somata and terminals were seen in ipsilateral parabigeminalnucleus,chiefly in caudal part,but their number was significantly decreased.It wasnoted that the labeled somata were sparse but labeled terminals were not found inthe parabigeminal nucleus,when the injection was restricted to superficial layers ofsuperior colliculus.After HRP injection into deeper layers of superior colliculus,there existed not only the labeled somata but also the labeled terminals in theparabigeminal nucleus,the former was distributed in bilateral parabigeminal nucleus,the latter in ipsilateral nucleus,chiefly in the caudal part.These results show thatthere are topographical connections between the parabigeminal nucleus and superiorcolliculus,and the parental somata contributing axons to the parabigeminal nucleusare located in deeper layers of the ipsilateral superior colliculus.更多还原