The duplex character of the corticofugal pathway from the striate cortex to the lateral geniculate complex of the cat.

From studies on signal conduction times in the corticofugal pathway from the striate cortex of the cat it has been proposed that S cells project to the LGN and C cells to the PGN. This concept has not received support from the histological examination of axons projecting to the two nuclei. The physiological experiments pointed to a clear segregation not apparent in the distribution of axonal diameters. A larger sample of signal conduction times, collected in the present study, is more consistent with the findings on the morphology of the pathway.