An electron microscopic study of neurones in the lateral geniculate nucleus of the monkey labelled by retrograde transport of horseradish peroxidase.

In a previous report horseradish peroxidase (HRP) reaction product has been described as accumulating in a restricted part of neurones in the lateral geniculate nucleus following injections of HRP into the visual cortex of the primate. With the aid of long series of ultrathin sections from the same material labelled neurones have been partially reconstructed in the present study, and it has been confirmed that HRP reaction product aggregates as a group of electron-dense lysosome-like bodies which form a cap to one side of the nucleus.