gray layers of superior colliculus
Definition: term applied to any one of the three major layers of gray matter of the superior colliculus that alternate with layers composed chiefly of nerve fibers: 1) the superficial gray layer of superior colliculus, external to the largely white layer of the incoming fibers of the optic tract (optic layer); 2) the intermediate gray layer of superior colliculus, placed between the optic layer and a more deeply located layer of fibers, the stratum lemnisci; and 3) the deep gray layer of superior colliculus, between the stratum lemnisci and the central gray substance surrounding the cerebral aqueduct, and containing the large nerve cells from which most of the colliculus descending connections (tectobulbar, tectopontine, and tectospinal tract) originate.
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