Internal and External Feedback Circuits for Skilled Forelimb Movement.

Internal and External Feedback Circuits for Skilled Forelimb Movement.
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DOI:
10.1101/sqb.2014.79.024786
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发表时间:
2014
期刊:
Cold Spring Harbor symposia on quantitative biology
影响因子:
--
通讯作者:
Jessell TM
Jessell TM
中科院分区:
其他
文献类型:
--
作者:
Azim E;Fink AJ;Jessell TM

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Skilled motor behavior emerges from interactions between efferent neural pathways that induce muscle contraction and feedback systems that report and refine movement. Two broad classes of feedback projections modify motor output, one from the periphery and a second that originates within the central nervous system. The mechanisms through which these pathways influence movement remain poorly understood, however. Here we discuss recent studies that delineate spinal circuitry that binds external and internal feedback pathways to forelimb motor behavior. A spinal presynaptic inhibitory circuit regulates the strength of external feedback, promoting limb stability during goal-directed reaching. A distinct excitatory propriospinal circuit conveys copies of motor commands to the cerebellum, establishing an internal feedback loop that rapidly modulates forelimb motor output. The behavioral consequences of manipulating these two circuits reveal distinct controls on motor performance, and provide an initial insight into feedback strategies that underlie skilled forelimb movement.
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