In the oviparous Teleost, Jordanella floridae, the Reissner fibre is early formed by the generalized secretory activity of the cells lining the ventricles. Subsequently the secretory activity becomes restricted to the subcommissural organ and the Reissner fibre is connected only with this structure. In Jordanella there is no secretory activity of the flexural organ. This finding differs from the data found in Gambusia (viviparous fish of the same suborder of Teleosts) and may be due to a different speed in the embryonal development. In Jordanella the subcommissural organ is monolayered and sends the secretion only to the third ventricle.
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Con il contributo del Ministero per i Beni e le Attività Culturali