Rental projections in the adult Xenopus laevis: a study with cobalt filling technique.

Cobaltic-lysine complex was used to show retinal projections in adult Xenopus laevis. Retinal fibres partially decussate in the chiasma, and terminate on both sides in the nucleus ovoidalis, lateral geniculate complex, pretectal area, optic tectum, and in the basal optic nucleus. Cobalt filled fibres were found in the preoptic area, dorsal hypothalamic area, and in the periventricular region close to the wall of the third ventricle.