The Edinger-Westphal nucleus in goldfish was identified by retrograde labeling from the ciliary ganglion. In the same animals a few neurons near this nucleus (perinuclear Edinger-Westphal neurons) were labeled by a different retrograde tracer injected into the cerebellum. No double-labeled cells were found. Similar results were obtained in kelp bass, except that in this species no cerebellar-projecting perinuclear neurons were observed. Cerebellar-projecting Edinger-Westphal neurons have previously been described in some mammals, but not in other vertebrates. Therefore the homology of cerebellar-projecting cells of the Edinger-Westphal region in mammals and teleost fishes is doubtful. © 1988.
Wathey, J. C., & Wullimann, M. F. (1988). A double-label study of efferent projections from the Edinger-Westphal nucleus in goldfish and kelp bass. Neuroscience Letters, 93(2–3), 121–126. https://doi.org/10.1016/0304-3940(88)90068-7