Abstract
We have studied the distribution of 3 extraretinal, subcortical inputs to the dorsal lateral geniculate nucleus of the prosimian primate Galago. Our connectional findings reveal that axons arising from the superior colliculus and the parabigeminal nucleus influence the W-cell system via their innervation of the two small-celled geniculate laminae (internal and external koniocellular) and the interlaminar zones; parabigeminal axons also innervate each of the 4-non-tectally innervated layers. Pretectal axons, on the other hand, distribute mainly to the parvocellular laminae and thus influence primarily the X-cell system.
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