Schmidt M
Institut für Biologie, TU Berlin, Germany.
Brain Res. 1997 Jan 23;746(1-2):71-84. doi: 10.1016/s0006-8993(96)01187-0.
In five species of decapod crustaceans--Cherax destructor (crayfish), Carcinus maenas (crab), Homarus americanus (clawed lobster), Eriocheir sinensis (crab), Macrobrachium rosenbergii (shrimp)--immunocytochemical stainings revealed the presence of sensory afferents with FMRFamide-like immunoreactivity in the central nervous system. These afferents were extremely thin, very numerous, and innervated all sensory neuropils except the optic and olfactory lobes. In their target neuropils they gave rise to condensed net- or ball-like terminal structures. Only in Homarus americanus but not in any other studied species immunocytochemistry revealed a separate, non-overlapping class of sensory afferents with substance P-like immunoreactivity. Also the afferents with substance P-like immunoreactivity were very thin and numerous, innervated all sensory neuropils except optic and olfactory lobes, and gave rise to condensed terminal structures. From their morphological characteristics it can be concluded that likely both classes of afferents are chemosensory. The substance P-like immunoreactivity suggests a link with the nociceptor afferents of vertebrates, with which both classes of afferents share several other morphological features.
在五种十足目甲壳动物中——澳洲红螯螯虾（小龙虾）、滨蟹、美洲螯龙虾（螯龙虾）、中华绒螯蟹（螃蟹）、罗氏沼虾（虾）——免疫细胞化学染色显示，在中枢神经系统中存在具有FMRF酰胺样免疫反应性的感觉传入神经。这些传入神经极其纤细，数量众多，支配除视叶和嗅叶外的所有感觉神经纤维网。在其目标神经纤维网中，它们形成密集的网状或球状终末结构。只有在美洲螯龙虾中，而在其他任何研究物种中都未发现，免疫细胞化学显示出一类单独的、不重叠的具有P物质样免疫反应性的感觉传入神经。同样，具有P物质样免疫反应性的传入神经也非常纤细且数量众多，支配除视叶和嗅叶外的所有感觉神经纤维网，并形成密集的终末结构。从它们的形态特征可以得出结论，这两类传入神经可能都是化学感觉神经。P物质样免疫反应性表明与脊椎动物的伤害感受器传入神经存在联系，这两类传入神经与脊椎动物的伤害感受器传入神经还共享其他几个形态学特征。
