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image of Crustaceana

The general brain morphology as well as the distribution and some histological features of in situ lipofuscin were investigated in brains of the Antarctic caridean decapods, Notocrangon antarctica and Chorismus antarcticus using light, confocal fluorescence, and transmission electron microscopy. The brain structure proved similar to that of other caridean shrimps in that it is close to the original decapod brain ground plan (prominent antenna II neuropil, subdivided large lateral antenna I neuropil, no accessory lobe), although a second cluster of globuli cells, characteristic for Pleocyemata, is associated with the olfactory lobe. In resin sections, autofluorescent lipofuscin granules were mainly found in the posterior olfactory lobe soma clusters, but they also occurred in other clusters and to a small extent in neuropils. Electron micrographs showed granules to be composed of a highly electron dense granular matrix, which enclosed membrane remnants of variable electron density. Vesicles interpreted to be lipofuscin in different stages of development were observed in the cytoplasm, whereas many mature granules seemed to be protracting from the cytoplasm into the plasma membranes. Staining of resin sections with Sudan Black was positive. The histological findings widely agree with results from studies on crustaceans as well as on vertebrates, and were very similar between the two species studied here.

Diese Studie untersucht mit Hilfe von Licht-, Konfokal- und Transmissionselektronenmikroskopie zum einen die Morphologie des Gehirns der zwei antarktischen Garnelen Notocrangon antarctica und Chorismus antarcticus. Zum anderen werden die Verteilung und einige histologische Charakteristika von in situ Lipofuszin im Gehirn dieser Garnelen beschrieben. Die Gehirnstruktur war der anderer Caridea vergleichbar und zeigte nur wenige Abwandlungen von dem ursprünglichen Bauplan der Dekapoden (prominentes antennales Neuropil, unterteiltes großes laterales antennulares Neuropil, kein akzessorischer Lobus). Abweichend vom ursprünglichen Bauplan war mit dem olfaktorischen Lobus eine zweite Ganglienzellgruppe, typisch für Pleocyemata, assoziiert. In Kunstharzschnitten wurden die autofluoreszierenden Lipofuszin-Körner hauptsächlich in der posterioren Ganglienzellgruppe des olfaktorischen Lobus, aber auch in anderen Ganglienzellgruppen sowie in geringer Anzahl in Neuropilen gefunden. Die elektronenmikroskopischen Aufnahmen zeigten, daß die Pigmentkörner elektronendichtes, feinkörniges Material enthielten, in das vor allem Membranreste verschiedener Elektronendichte eingeschlossen waren. Lipofuszinkörper in verschiedenen Reifestadien befanden sich im Zytoplasma, während viele reife Lipofuszinkörper sich bis in die Plasmamembran hinein erstreckten. Das Anfärben von Lipofuszin mit Sudan Schwarz war positiv. Die histologischen Ergebnisse stimmen weitgehend mit Ergebnissen von anderen Studien an Crustacea sowie an Vertebraten überein und unterscheiden sich wenig zwischen den beiden Untersuchungsarten.


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