Feedback in the brainstem: an excitatory disynaptic pathway for control of whisking.

Feedback in the brainstem: an excitatory disynaptic pathway for control of whisking.
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DOI:
10.1002/cne.23724
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发表时间:
2015-04-15
影响因子:
2.5
通讯作者:
Kleinfeld, David
Kleinfeld, David
中科院分区:
医学3区
文献类型:
--
作者:
Matthews, David W.;Deschenes, Martin;Furuta, Takahiro;Moore, Jeffrey D.;Wang, Fan;Karten, Harvey J.;Kleinfeld, David

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Sensorimotor processing relies on hierarchical neuronal circuits to mediate sensory-driven behaviors. In the mouse vibrissa system, trigeminal brainstem circuits are thought to mediate the first stage of vibrissa scanning control via sensory feedback that provides reflexive protraction in response to stimulation. However, these circuits are not well defined. Here, we describe a complete disynaptic sensory receptor-to-muscle circuit for positive feedback in vibrissa movement. We identified a novel region of trigeminal brainstem, spinal trigeminal nucleus pars muralis, that contains a class of vGluT2+ excitatory projection neurons involved in vibrissa motor control. Complementary single- and duallabeling with traditional and virus tracers demonstrate that these neurons both receive primary inputs from vibrissa sensory afferent fibers and send monosynaptic connections to facial nucleus motoneurons that directly innervate vibrissa musculature. These anatomical results suggest a general role of disynaptic architecture in fast positive feedback for motor output driving active sensation.
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