Particularities of olfactory system in zebra fish (Danio rerio)

Abstract

Histological study of olfactory bulbs and peripheric olfactory organs were made on 10 adult zebra fiskes (Danio rerio), both sexes, using paraphin embeding method and HEA and PAS stain. Zebra fish is a very good model for studying the mecanisms for odour detection, olfactory changes of the environement and behavioural effects of them. Olfactory system in zebra fish is formed by a pair of olfactory peripherical organs or rosets, situated in nasal cavity, conected at the olfactory bulbs. Sensorial region of the rosete have an characteristic pseudostratified columnar epithelium consisting mainly from sensitive olfactory neurons. Olfactory bulb is a cerebral structure situated in the most rostral region of the anterior brain, conected to olfactory bulb by a short olfactory nerf. It is the central receptor when the olfactory informations are prepared and sent to telencephalic regions.