Polarity of structure and of ordered nerve connections in the developing amphibian brain.
Tectal polarity for retinal connections remains reversible long after the anatomical pattern of neural structures has been determined. Cells in the diencephalon seem to control this polarity. Following certain embryonic operations, the diencephalon developed behind the tectum. In such cases, the polarity of the retino-tectal projection was reversed.
D000818:Animals; D001931:Brain Mapping; D004027:Diencephalon / Q000196:embryology*; D009434:Neural Pathways; D009900:Optic Nerve / Q000196:embryology; D012160:Retina / Q000196:embryology; D013477:Superior Colliculi / Q000196:embryology*; D014795:Visual Pathways / Q000196:embryology*; D014981:Xenopus