title: Topographic projections between the nucleus isthmi and the optic tectum in a teleost. Navodon modestus.
abstract: Following horseradish peroxidase injections into the optic tectum of a teleost, Navodon modestus, reciprocal and topographic projections between the nucleus isthmi and the ipsilateral optic tectum were determined. The isthmo-tectal fibers diverge to the optic tectum while maintaining the spatial arrangements of the isthmic cells from which the fibers originate. The tecto-isthmic projections also keep the spatial arrangements in the optic tectum. The tectal fibers converge near the nucleus isthmi and terminate in the non-cellular portion of the nucleus. The reciprocal topography is apparent in the combined results of 9 experiments with one tectal injection in each region. No labeled cells and fibers were found in the contralateral nucleus isthmi.
mesh_terms: D000818:Animals; D001370:Axonal Transport; D001921:Brain / Q000033:anatomy & histology*; D005399:Fishes; D007839:Functional Laterality; D006735:Horseradish Peroxidase; D013477:Superior Colliculi / Q000033:anatomy & histology*; D013687:Telencephalon / Q000033:anatomy & histology
chemical_list: D006735:Horseradish Peroxidase