Modification of statocyst input to local interneurons by behavioral condition in the crayfish brain
Modification of statocyst input to local interneurons by behavioral condition in the crayfish brain
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DOI：
10.1007/s00359-005-0630-z
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发表时间：
2005-08-01
影响因子：
2.1
通讯作者：
Takahata, M
中科院分区：
文献类型：
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作者：
Hama, N;Takahata, M
在十足类甲壳类动物中，他定囊的姿势控制受到腿部状况的影响。我们研究了在小龙虾脑中，局部中间神经元对他汀囊刺激的突触反应是如何受到腿在底物上和底物外运动的影响的。磁场刺激法允许通过模仿身体滚动来持续刺激他汀囊受体。他汀囊驱动的局部中间神经元分为四种形态类型(类型I-IV)。除IV型外，所有中间神经元的树突分支均投射到中脑的嗅旁叶，即他汀囊传入神经元的直接投射部位。无论腿部状况如何，腹侧束内有胞体的I型中间神经元对他汀囊刺激的反应是恒定的，而在腹侧不成对的后束内有胞体的I型中间神经元，在下层上的腿部运动时，反应增强或抑制，这取决于细胞的不同，但在离开下层的腿自由运动时，反应没有变化。腿部运动对II型和IV型中间神经元的突触反应也有不同程度的影响，但III型中间神经元的突触反应没有受到影响。这些发现表明，小龙虾大脑中的他汀囊通路是与受腿部状况影响和未受影响的局部回路平行组织的。
Posture control by statocysts is affected by leg condition in decapod crustaceans. We investigated how, in the crayfish brain, the synaptic response of local interneurons to statocyst stimulation was affected by leg movements on and off a substratum. The magnetic field stimulation method permitted sustained stimulation of statocyst receptors by mimicking body rolling. The statocyst-driven local interneurons were classified into four morphological groups (Type-I-IV). All interneurons except Type-IV projected their dendritic branches to the parolfactory lobe of the deutocerebrum where statocyst afferents project directly. Type-I interneurons having somata in the ventral-paired lateral cluster responded invariably to statocyst stimulation regardless of the leg condition, whereas others having somata in the ventral-unpaired posterior cluster showed response enhancement or suppression, depending on the cell, during leg movements on a substratum, but no response change during free leg movements off the substratum. The synaptic responses of Type-II and IV interneurons were also affected differently by leg movements depending on the substratum condition, whereas those of Type-III remained unaffected. These findings suggest that the statocyst pathway in the crayfish brain is organized in parallel with local circuits that are affected by leg condition and those not affected.