The organization of the olfactory lobes in Euphausiacea and Mysidacea (Crustacea, Malacostraca)
The organization of the olfactory lobes in Euphausiacea and Mysidacea (Crustacea, Malacostraca)
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磷虾科和糠虾科（甲壳纲、软甲纲）嗅叶的组织
作者：
K. Johansson;E. Hallberg
摘要对真甲壳动物和甲壳动物的嗅叶结构进行了研究和比较，并与其他甲壳动物和昆虫中所描述的结构进行了比较。在所研究的真鼻虫和Mysid物种中，嗅球束和与嗅叶相关的细胞团的位置显示出类似的排列。这一安排与十足类甲壳类中描述的一致。两个类群的嗅叶神经束均呈肾小球排列。这些肾小球部分包裹在神经胶质包裹中，是嗅叶内建立突触联系的唯一部位。这种肾小球排列看起来类似于昆虫触角叶中所描述的排列，但不同于十足甲壳类中所描述的柱状排列。此外，约有15-20个FMRFamide样免疫反应球状细胞被标记，它们在所调查的物种中占据相似的位置。来自这些细胞的轴突只终止于嗅叶小球，因此它们被认为是内在的中间神经元。嗅叶中缺乏5-羟色胺样免疫反应，这一特征仅被归因于真鼻虫和Mysids。在雄性Mysids中有一个特殊的神经纤维区，它位于嗅叶的前面。Mysids中雄性特有的神经纤维和昆虫复合体中的大肾小球被解释为类似的结构。
SummaryThe structural organization of the olfactory lobes in representatives of euphausiid and mysid crustaceans was investigated and compared, also with these structures described in other crustaceans and in insects. In the investigated euphasiid and mysid species, the olfactory-globular tract and the position of cell clusters associated with the olfactory lobes show a similar arrangement. This arrangement is in agreement with that described in decapod crustaceans. The olfactory lobe neuropil in representatives of both taxa shows glomerular arrangement. These glomeruli are partly enclosed in a glial wrapping, and they represent the only site where synaptic contacts are established within the olfactory lobes. This glomerular arrangement appears similar to that described in the antennal lobe of insects, but differs from the columnar arrangement described in decapod crustaceans. Furthermore, about 15–20 FMRFamide-like immunoreactive globuli cells were labeled and they occupy a similar position in the investigated species. Neurites from these cells terminate only in the olfactory lobe glomeruli, and they are therefore regarded as intrinsic interneurons. The absence of serotonin-like immunoreactivity in the olfactory lobes is a feature only ascribed to the euphausiids and mysids. A specific neuropil area is present in male mysids, and it occupy a position forward of the olfactory lobe. The male-specific neuropil in mysids and the macro-glomerular in insects complex are interpreted as analogous structures.