Malformations of the regenerating optic tectum of larvae of the Egyptian toad, Bufo regularis Reuss.

Morphological and histological abnormalities were observed in the regenerating optic tecta of Bufo regularis larvae after partial excision of the left tectum and total excision of the right tectum. They were found in both the left and the right tectum. Invagination of the tectal tissue into the optic ventricle, masses of blood capillaries and gaps or cavities in the tectal tissue were observed. The size of the optic tecta was reduced and the shape and structure of the dorsal aspect of the midbrain were highly anomalous.