Projections of cerebellar Purkinje cells in the dogfish, Scyliorhinus.

In the dogfish Scyliorhinus degenerating axons and terminals arising from Purkinje cells and resulting from small superficial lesions made in the cerebellar corpus were found to be predominantly restricted to the ipsilateral cerebellar nucleus; none was observed in the tegmentum. Horseradish peroxidase placed within the cerebellar nucleus was transported retrogradely to the Purkinje cells. It appears that in these fishes, as in mammals, cerebellar output is relayed through cerebellar nuclei.