Interneurons of the crayfish brain: the relationship between dendrite location and afferent input.
Interneurons of the crayfish brain: the relationship between dendrite location and afferent input.
复制标题
小龙虾大脑的中间神经元：树突位置与传入输入之间的关系。
DOI：
10.1002/neu.480120402
复制
发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Viancour,T
中科院分区：
文献类型：
--
作者：
Glantz,RM;Kirk,M;Viancour,T
本研究旨在探讨螯虾脑下行中间神经元的结构与功能之间的关系。特别是，树突领域进行了检查，以确定是否在任何六个大脑hemineuromeres（其subserve特定的感觉方式）的神经元间树突的位置是一个必要的或充分的条件，以确定功能和/或突触输入的interneuron。如果一个神经元投射一个树突到中脑或后脑的半神经节，在我们的观察中，95%的神经元从相应的传入根获得感觉输入。大多数这些输入（86%）包含至少一个单突触组件。相反地，如果一个细胞从所测试的四个中脑根和三脑根中的三个中的任何一个获得单突触输入，则在适当的半神经节中具有相应的树突（在我们的观察中为98%）。来自对侧触角神经的输入是这个规则的例外。在前脑树突的存在是不足以预测可检测的视觉输入，但每一个可检测的视觉输入的实例是与一个前脑树突。多突触输入通常（42%）与相应的树突无关。在不同动物的神经元中重复填充染料，我们只观察到较小的二级和三级神经突的数量和精确位置的显着变化。这种变化很少影响由神经元支配的感觉叶的子集。
This study was undertaken to examine the relationship between the structure and function of the descending interneurons of the crayfish brain. In particular, the dendritic fields were examined to ascertain if the location of an interneuronal dendrite in any of the six cerebral hemineuromeres (which subserve specific sensory modalities) is a necessary or sufficient condition to determine the functional and/or synaptic input to the interneuron. If a neuron projects a dendrite to a hemineuromere of the deutocerebrum or tritocerebrum, the neuron derives sensory input from the corresponding afferent root in 95% of our observations. Most of these inputs (86%) contain at the least a monosynaptic component. Conversely, if a cell derives monosynaptic input from any one of three of the four deutocerebral and tritocerebral roots tested, it has a corresponding dendrite (in 98% of our observations) in the appropriate hemineuromere. Input from the contrlateral antennal nerve is an exception to this rule. The presence of a dendrite in the protocerebrum is not sufficient for predicting detectable visual input, but every instance of detectable visual input is associated with a protocerebral dendrite. Polysynaptic inputs are frequently (42%) not associated with corresponding dendrites. In neurons that were repeatedly dye filled in different animals, we observed significant variation only in the number and precise location of the smaller secondary and tertiary neurites. This variation rarely influenced the subset of sensory lobes innervated by the neuron.