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superior colliculi

Various levels of neuronal somata and associated white matter processes alternate in the superior colliculus. It may be broken down into seven levels at increasing depths from the surface: the periventricular, radial, surface grey (stratum cinereum), optic, middle grey, deep grey, and deep white strata. These strata are alternatively made up of neuronal cases this means or their processes. The external corticotectal tract brings myelinated and non-myelinated fibres from the occipital cortex, which make up most of the zonal layer. Additionally, it has a few tiny, horizontally arranged neurones.

The superficial grey layer, which sits on top of the deeper layers in a crescentic lamina, is filled with many tiny multipolar interneurons where cortical fibres synapse.

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