The olfactory nervous system of the old world monkey.

This paper reviews work on olfactory function performed in the author's laboratory over the last 10 years. The following aspects of this work are covered. Neocortical olfactory areas were studied in old world monkeys. Olfactory responses were found in the lateroposterior and centroposterior portions of the orbitofrontal cortex (LPOF and CPOF). The routes of the olfactory nerve pathways to the LPOF and the CPOF were examined. An olfactory pathway to the lateral hypothalamic area (LHA) was also studied. Using unanesthetized monkeys, information processing of odors was studied in the OB, PPF-MA, LPOF, MDmc, CPOF, and LHA. In the LPOF and LHA, half or more of the cells responded differentially to one odor. We have thus been able to clearly demonstrate discrimination of odors at the cell level in these areas.