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image of Crustaceana

Immunocytochemical methods using an antibody raised against serotonin (5-HT) were used to identify presumptive serotonergic structures in the ventral nerve cord of Palaemonetes mesogenitor. Every segmental thoracic ganglion contains one pair of labelled neurons. Immunoreactive fibres are arranged in three pairs of rostro-caudal bundles: the medial fibre bundles (MFB) and the lateral fibre bundles (LFB) run longitudinally through the entire thoracic and abdominal nerve cord; the central fibre bundles (CFB) extend only between the second and the fourth thoracic ganglia. These results are discussed and compared with the descriptions from lobster by Beltz & Kravitz (1987) and from crayfish by Real & Czternasty (1990).

Des méthodes immunocytochimiques utilisant un anticorps contre la sérotonine (5-HT) ont été employées pour identifier les structures sérotonergiques dans la chaîne nerveuse ventrale de Palaemonetes mesogenitor. Chaque ganglion thoracique segmentaire contient une paire de neurones marqués. Les fibres immunoréactives sont arrangées en trois paires de faisceaux rostro-caudaux: les faisceaux médians (MFB) et latéraux (LFB) courent longitudinalement sur toute la longueur de la chaîne nerveuse thoracique et abdominale; les faisceaux centraux (CFB) ne s’étendent qu’entre les seconds et quatrièmes ganglions. Ces résultats ont été discutés et comparés avec les descriptions chez le homard part Beltz & Kravitz (1987) et chez l’écrevisse par Real & Czternasty (1990).


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