The Rohon-Beard cells are not detected in the developing spinal cord of an ovoviviparous fish, Gambusia affinis. The lack of this embryonal sensitive system is supposed to be due to the development within the maternal body, the embryo being isolated from the external environnement. In the cervical spinal cord of adult fishes some large dorsal neurons are found, similar to the "supramedullary neurons" already described in other species of adult Teolosts.
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Con il contributo del Ministero per i Beni e le Attività Culturali