INTERLAYER NEURONS IN THE RAT SUPERIOR COLLICULUS - A TRACER STUDY USING DIL DI-ASP/

FIVE different populations of interlayer neurones (ILNs) can be descri bed after DLI/Di-ASP tracing in rat superior colliculus (SC), All of t hese labelled neurones preferentially lay in the rostro-medial part of the SC. Most of them are located in the stratum opticum and in the st ratum griseum superficiale. Our results indicate that ILNs represent a minority of neurones in the superficial layers but may constitute a s ubstantial population of neurones in the stratum opticum connecting th e visual and the multimodal collicular layers.