The projection from the lateral geniculate nucleus to the prestriate cortex of the macaque monkey

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Abstract
By injecting the enzyme horseradish peroxidase into the prestriate cortex of the macaque monkey and examining the lateral geniculate nucleus (l.g.n.) for retrograde label, the presence of a direct projection from the l.g.n. to prestriate visual cortex (Brodmann's areas 18 and 19) was confirmed. Labelled cells occurred in all layers of the l.g.n., distributed in a roughly columnar fashion. The large scatter in cell distribution indicated a lower retinotopic precision for this projection than for the one to area 17. Labelled cells are of a medium to large size and, in each section, a few were located near the laminar border or in interlaminar zones. The functional significance of this projection is discussed.
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