Neuroelectrophysiology of the morphologically asymmetric habenulae of the frog

1. Electrophysiological recordings of the spontaneous and evoked activities of the frog habenular nuclei are presented. 2. The traces were recorded simultaneously from both habenular nuclei and an histological test was performed in order to show the exact location where the electrodes were inserted in the brain for the purpose of making the recordings. 3. The traces show a dissimilarity which agrees with the morphological asymmetry of these nuclei demonstrated histologically.