Vertebrates other than mammals have vision cell layer {optic tectum} over large ventricle. Mammals have superior colliculi instead. In amphibia and fish, fibers from retina to tectum keep growing and changing. Mostly unimodal sense pathways go from cerebral cortex to tectum. Tectum makes eye saccades to focus attention-getting object on fovea. Divergence in individual tectum-nuclei loops explains how large recruited tectum-neuron population can form composite command observed at tectum.
Biological Sciences>Zoology>Organ>Nerve>Brain>Brainstem>Midbrain
4-Zoology-Organ-Nerve-Brain-Brainstem-Midbrain
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Date Modified: 2022.0224