Wroblewska Joanna, Whalley Sean, Fischetti Melissa, Daniel Peter C
Department of Biology, Hofstra University, Hempstead, NY 11549-1140, USA.
Chem Senses. 2002 Nov;27(9):769-78. doi: 10.1093/chemse/27.9.769.
Crustaceans such as crabs and lobsters clean or 'groom' their olfactory organ, the antennule, by wiping it through a pair of mouthpart appendages, the third maxillipeds. In the lobster, only a few chemicals found in prey extracts, especially glutamate, elicit grooming. Chemosensory input driving grooming is likely to be mediated via sensilla located on antennules and third maxillipeds. Chemosensory antennular sensilla are innervated by neurons with central projections either to the glomerular olfactory lobe (aesthetasc sensilla) or to non-glomerular antennular neuropils (nonaesthetasc sensilla). By selectively ablating the chemosensory sensilla on the antennules and the third maxillipeds we have determined that the aesthetascs are necessary and sufficient to drive grooming behavior. Chemosensory activation of antennular grooming behavior likely follows a 'labeled-line' model in that aesthetasc neurons tuned to glutamate provide adequate input via the olfactory lobe to motor centers in the brain controlling antennular movements.
像螃蟹和龙虾这样的甲壳类动物会通过一对口器附肢——第三颚足，擦拭它们的嗅觉器官——小触角，来清洁或“梳理”小触角。在龙虾中，只有猎物提取物中发现的少数化学物质，尤其是谷氨酸，会引发梳理行为。驱动梳理行为的化学感应输入可能是通过位于小触角和第三颚足上的感觉毛介导的。化学感应的小触角感觉毛由神经元支配，这些神经元的中央投射要么到肾小球状的嗅觉叶（嗅觉感觉毛），要么到非肾小球状的小触角神经纤维网（非嗅觉感觉毛）。通过选择性地切除小触角和第三颚足上的化学感应感觉毛，我们已经确定嗅觉感觉毛对于驱动梳理行为是必要且充分的。小触角梳理行为的化学感应激活可能遵循“标记线”模型，即调谐到谷氨酸的嗅觉感觉毛神经元通过嗅觉叶向控制小触角运动的大脑运动中枢提供足够的输入。
