Influence of the tectal zone on the distribution of synaptic boutons in the brainstem of goldfish.

摘要: This study investigated whether the topographic differences in functional properties of tectal motor map goldfish are related to particular patterns connections with downstream structures. With this aim, distribution synaptic boutons mesencephalic and rhombencephalic structures was studied after discrete injections tracer biotinylated dextran amine were placed at separate sites along anteroposterior axis. Irrespective location injection site, more abundant mesencephalon than rhombencephalon, they located chiefly ipsilaterally all throughout brainstem. In mesencephalon, found its ventrolateral reticular formation and, a lesser extent, nucleus medial longitudinal fasciculus, oculomotor isthmi nuclei, torus semicircularis. formation, bouton distributed topographically respect site. Terminals also observed fasciculus into anteromedial or middle zones. nucleus, present exclusively case injection. most superior their number decreased inferior formations. A could be within although density attenuated compared that formation. The domains endings on ipsilateral side different from those contralateral side: medially. Finally, few vestibulocerebellar area either side, depending From these data, authors conclude that, goldfish, irrespective similar nuclei brainstem; however, such can each zone.