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Spinal premotor interneurons controlling antagonistic muscles are spatially intermingled

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Item Type:Article
Title:Spinal premotor interneurons controlling antagonistic muscles are spatially intermingled
Creators Name:Ronzano, R. and Skarlatou, S. and Barriga, B.K. and Bannatyne, B.A. and Bhumbra, G.S. and Foster, J.D. and Moore, J.D. and Lancelin, C. and Pocratsky, A.M. and Özyurt, M.G. and Smith, C.C. and Todd, A.J. and Maxwell, D.J. and Murray, A.J. and Pfaff, S.L. and Brownstone, R.M. and Zampieri, N. and Beato, M.
Abstract:Elaborate behaviours are produced by tightly controlled flexor-extensor motor neuron activation patterns. Motor neurons are regulated by a network of interneurons within the spinal cord, but the computational processes involved in motor control are not fully understood. The neuroanatomical arrangement of motor and premotor neurons into topographic patterns related to their controlled muscles is thought to facilitate how information is processed by spinal circuits. Rabies retrograde monosynaptic tracing has been used to label premotor interneurons innervating specific motor neuron pools, with previous studies reporting topographic mediolateral positional biases in flexor and extensor premotor interneurons. To more precisely define how premotor interneurons contacting specific motor pools are organized, we used multiple complementary viral-tracing approaches in mice to minimize systematic biases associated with each method. Contrary to expectations, we found that premotor interneurons contacting motor pools controlling flexion and extension of the ankle are highly intermingled rather than segregated into specific domains like motor neurons. Thus, premotor spinal neurons controlling different muscles process motor instructions in the absence of clear spatial patterns among the flexor-extensor circuit components.
Keywords:Spinal Cord, Premotor Interneurons, Flexor Muscles, Extensor Muscles, Rabies, Viral Tracing, Animals, Mice
Publisher:eLife Sciences Publications
Page Range:e81976
Date:13 December 2022
Official Publication:https://doi.org/10.7554/eLife.81976
PubMed:View item in PubMed

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