A direct cerebello-telencephalic projection in an electrosensory mormyrid fish

After injections of the posterior part of the lateral zone of the area dorsalis telencephalic (Dlp) with either horseradish peroxidase or the newly available carbocyanine dye DiI, efferent cells were labeled in the valvula cerebelli of the mormyrid fish, Gnathonemus petersii. This may be a unique connection for this group of electrosensory teleosts, since no other vertebrate has ever been reported before to have a direct cerebello-telencephalic projection.