[A new visual pathway in an anour amphibian, Discoglossus pictus]

The retino-tectai projections of the Anura Discoglossus pictus were examined on seventeen adult specimens unilaterally enucleated. After a postoperative survival period of 9 to 105 days, the degenerating fibers and terminals were shown by Nauta and electromicroscopic techniques. This work points out the existence of a direct ipsilateral retino-tectal pathway in Anura. Typical terminal degenerations were seen in the postero-medial part of the ipsilateral tectum. The implications of this new anatomical pathway in binocular vision is discussed.