. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. 132 M. UND S. HARZSCH. Abbildung 5. Proliferierende Zellen im zentralen olfaktorischen weg von Erwachsenen Einsiedlerkrebs (Pagurus bernlninhis: Anomura [Anomala]; Paguridae) durch in vim BrdU-Kennzeichnung. Licht Aufnahmen von vibratome Abschnitte. (Ein. b) zentrale Gehirn. In den seitlichen soma Cluster (LC). Eine kompakte Gruppe von kleinen BrdU-positiven Kerne (Pfeile) befindet sich in der Nähe der neuropil des olfaktorischen lobe (OL). (C) Eyestalk Ganglienzellen. In der soma Cluster (HBC) Der hemiellipsoid Körper (HB). Eine kompakte Gruppe ot klein Brändli - p

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 132 M. SCHMIDT AND S. HARZSCH. Figure 5. Proliferating cells in the central olfactory pathway of adult hermit crab (Pagurus bernlninhis: Anomura [Anomala]; Paguridae) identified by in vim BrdU-labeling. Light micrographs of vibratome sections. (a. b) Central brain. In the lateral soma clusters (LC). a compact group of small BrdU-positive nuclei (arrows) is located close to the neuropil of the olfactory lobe (OL). (c) Eyestalk ganglion. In the soma cluster (HBC) of the hemiellipsoid body (HB). a compact group ot small BrdLI-posilive nuclei is located close to the HB neuropil. Note scattered BrdU-positive nuclei (arrowheads) in the soma clusters of visual neuropils (medulla interna = MI; medulla externa = ME). Inset: Higher magnification shows shows spherical and hence neuronal shape of BrdU-positive nuclei. shrimp (Sicyonia brevirostris), where 5 eyestalks were an- alyzed. However, in all tested species, very few nuclei located in the HBC were labeled in most specimens; the same was true for other soma clusters of the eyestalk gan- glia, especially the soma clusters of the three visual neuro- pils. Most of these BrdU-positive nuclei were either flat and elongated, and thus probably represent glial cells; or they were more spherical but clearly associated with arterioles passing through the soma clusters, and thus probably rep- resent connecthr tissue cells constituting the wall of these hemolymph vesM. Hut some nuclei in soma clusters were spherical and not ob iously associated with arterioles; thus they might represent lu-uronal precursor cells. Discussion We demonstrate by in vm> labeling with BrdU that mi- totic activity in the neuronal soma clusters of the central olfactory pathway appears to be a common feature of adult decapod crustaceans; this result corroborates and substan- tially extends previous findings for juvenile and adult shore crabs (Ccircintis niaenas) and for the Australian cr

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