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The organization of projections of the retinorecipient and nonretinorecipient nuclei of the pretectal complex and layers of the superior colliculus to the lateral pulvinar and medial pulvinar in the macaque monkey

The organization of five projections from the retinorecipient and non‐retinorecipient layers of the superior colliculus (SC) and nuclei of the pre‐tectum to the lateral pulvinar, medial pulvinar, and dorsal lateral geniculate nucleus (DLG) of the thalamus in the macaque monkey were established by using both anterograde autoradiographic and retrograde horseradish perox‐idase tracing techniques. Some projections from these midbrain regions to the inferior pulvinar are also described as are projections to the thalamus from the tectorccipient parabigeminal nucleus. First, the retinorecipient and nonretinorecipient pretectal nuclei and SC layers were determined by Nissl stains, myelin stains, and the distribution of label resulting from intraocular injections of tritiated amino acids. The possible projections of these pre‐tectal nuclei, layers of the SC (as well as the parabigeminal nucleus), to the pulvinar and DLG were then determined by both horseradish peroxidase and autoradiographic tracing methods. The retinal projections to the SC extend throughout layers II‐l, II‐2, II‐3, and dorsal III with obvious patches in layers II‐l and II‐2 as described before by others. There were a number of pretectal nuclei which also had connections with the retina. In the nomenclature adopted, these include the sublentiform nucleus, the nucleus of the optic tract (not to be confused with the thalamic limitansnucleus), the posterior (orprincipal) pretectalnucleus, and the laminatedolivary nucleus (with a head and tail). The nucleus of the posterior commissure and the nucleus of the pretectal area do not receive retinal projections.