Effects of Carbon Dioxide on Deep Structures of Temporal Lobe of the Brain in the Marsupial Phalanger

¹ From the Department of Anatomy, University of Melbourne, Victoria, Australia

The effects of inhalation of 10% and 30% CO₂ on the evoked potentials from the fornix-hippocampal system in the marsupial phalanger were determined. The spontaneous and evoked activity of this system is depressed by CO₂, with the dorsal hippocampus apparently more susceptible than the ventral hippocampus, especially where the evoked potentials from stimulation of the fornix were recorded in the region of the hippocampal pyramidal cell layer.