The Rohon-Beard neurons in Urodelan Amphibians (Triturus cristatus) take their typical shape and size early and quickly (in embryo st. 36); they do not differentiate at the same time, their definitive number being reached only at the hatching time (st. 40-41). At the beginning of the larval period (st. 48-50) some Rohon-Beard cells of the cervical region show degenerative aspects and start to rarefy; their rarefaction runs caudally. In the metamorphosed animals, the Rohon-Beard cells have disappeared. The Rohon-Beard cells of the Urodelan Amphibians are transient neurons, whose function, as sensory system, is carried out before the spinal ganglia differentiation.
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Con il contributo del Ministero per i Beni e le Attività Culturali