A study of the effects of dehydration, darkness and thyroid hormone on the subcommissural organ of Urodelan (Triturus cristatus Laur.) and Anuran Amphibians (Rana esculenta L., Hyla arborea L.) gave the following results: 1) in the Urodelan the subcommissural cells do not react in any of the experimental treatments, 2) in the Anurans these cells react showing modifications of the basal secretion. Thus it is inferred that morphological differences in the subcommissural organ between Anurans and Urodelans are related to different functional behaviours.
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Con il contributo del Ministero per i Beni e le Attività Culturali