Abstract:
:How do descending inputs from the brain control leg motor circuits to change how an animal walks? Conceptually, descending neurons are thought to function either as command-type neurons, in which a single type of descending neuron exerts a high-level control to elicit a coordinated change in motor output, or through a population coding mechanism, whereby a group of neurons, each with local effects, act in combination to elicit a global motor response. The Drosophila Moonwalker Descending Neurons (MDNs), which alter leg motor circuit dynamics so that the fly walks backwards, exemplify the command-type mechanism. Here, we identify several dozen MDN target neurons within the leg motor circuits, and show that two of them mediate distinct and highly-specific changes in leg muscle activity during backward walking: LBL40 neurons provide the hindleg power stroke during stance phase; LUL130 neurons lift the legs at the end of stance to initiate swing. Through these two effector neurons, MDN directly controls both the stance and swing phases of the backward stepping cycle. These findings suggest that command-type descending neurons can also operate through the distributed control of local motor circuits.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Feng K,Sen R,Minegishi R,Dübbert M,Bockemühl T,Büschges A,Dickson BJdoi
10.1038/s41467-020-19936-xsubject
Has Abstractpub_date
2020-12-02 00:00:00pages
6166issue
1issn
2041-1723pii
10.1038/s41467-020-19936-xjournal_volume
11pub_type
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