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Positional Strategies for Connection Specificity and Synaptic Organization in Spinal Sensory-Motor Circuits

机译:脊柱感觉电动机电路中连接特异性和突触组织的位置策略

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摘要

Proprioceptive sensory axons in the spinal cord form selective connections with motor neuron partners, but the strategies that confer such selectivity remain uncertain. We show that muscle-specific sensory axons project to motor neurons along topographically organized angular trajectories and that motor pools exhibit diverse dendritic arbors. On the basis of spatial constraints on axo-dendritic interactions, we propose positional strategies that can account for sensory-motor connectivity and synaptic organization. These strategies rely on two patterning principles. First, the degree of axo-dendritic overlap reduces the number of potential post-synaptic partners. Second, a close correlation between the small angle of axo-dendritic approach and the formation of synaptic clusters imposes specificity of connections when sensory axons intersect multiple motor pools with overlapping dendritic arbors. Our study identifies positional strategies with prominent roles in the organization of spinal sensory-motor circuits.
机译:在脊髓中的脊髓形成性感轴突与运动神经元合作伙伴的选择性联系,但赋予这种选择性的策略仍然不确定。我们展示了肌肉特定的感官轴突,沿着地形组织的角度轨迹突出到电机神经元,并且电机池具有不同的树突型。在腋窝互动的空间限制的基础上,我们提出了可以考虑感官电动机连接和突触组织的位置策略。这些策略依赖于两个图案化原则。首先,轴突重叠的程度降低了突触后伴侣的潜在潜在伙伴的数量。其次,当感觉轴突与重叠的树突轴承相交时,施工簇的小角度与突触簇的形成之间的紧密相关性施加了连接的特异性。我们的研究确定了脊柱感觉电机电路组织中具有突出作用的位置策略。

著录项

  • 来源
    《Neuron》 |2019年第6期|共18页
  • 作者单位

    Columbia Univ Mortimer B Zuckerman Mind Brain &

    Behav Inst Dept Neurosci New York NY 10027 USA;

    Columbia Univ Mortimer B Zuckerman Mind Brain &

    Behav Inst Dept Neurosci New York NY 10027 USA;

    Columbia Univ Dept Neurosci New York NY 10032 USA;

    Columbia Univ Mortimer B Zuckerman Mind Brain &

    Behav Inst Dept Neurosci New York NY 10027 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 神经病学;
  • 关键词

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