[New findings on the organization of retinal projections in the Scyliorhinus canicula shark. Radioautographic study].
The retinal projections of the shark Scyliorhinus canicula were re-examined using the radioautographic method following the intraocular injection of tritiated tracers. New primary visual centers were identified. Overall 12 distinct sites of termination of contralateral optic endings were found distributed within five levels of the brain (hypothalamus, thalamus, pretectum, tectum and mesencephalic tegmentum). Furthermore the presence of a small ipsilateral retinal projection was demonstrated attaining the hypothalamic thalamo:pretectal and tectal levels. These new data broaden our understanding of the organization of the primary visual system in Scyliorhinus as defined previously using the degeneration technique.
D000818:Animals; D001345:Autoradiography; D012160:Retina / Q000033:anatomy & histology*; D012754:Sharks / Q000033:anatomy & histology*; D014795:Visual Pathways / Q000033:anatomy & histology*
Nouvelles données sur l'organisation des projections rétiniennes chez le requin Scyliorhinus canicula. Etude radioautographique.