ÉTUDE HISTOLOGIQUE ET ULTRASTRUCTURALE DES CELLULES NEUROSÉCRÉTRICES CÉPHALIQUES DE PALAEMONETES MESOGENITOR SOLLAUD, 1912 (CRUSTACEA, DECAPODA, PALAEMONIDAE)

摘要

Palaemonetes mesogenitor, a freshwater prawn, was collected in the Sidi Bou Ali waterway at Tozeur. Eyestalks and supraoesophagal ganglia were excised and fixed in Halmi. Transverse sections paraffin of embedded tissue were stained with paraldehyde fuchsine, alcian blue and eosine toluidine blue. For ultrastructural study, eyestalks were double-fixed on ice in 3% glutaraldehyde and 2% osmium tetroxide solutions with osmo-larity buffered at 650 milliosmoles with sodium cacodylate. The tissues were embedded in Spurr's resin and ultrathin transverse sections were cut and contrasted with aqueous uranyl acetate and lead citrate.%Au niveau du cerveau et du pédoncule oculaire de la crevette des cours d'eau du sud tunisien, Palaemonetes mesogenitor, cinq types de cellules neurosécrétrices (a, b, b', c, e) ont été distinguées en se basant sur la morphologie et la taille de leur granules de neurosécrétion ainsi que sur l'aspect de leur réticulum endoplasmique. Un sixième type, d, n'a été repéré que dans les pédoncules oculaires.