Journal article
Separate Microcircuit Modules of Distinct V2a Interneurons and Motoneurons Control the Speed of Locomotion
Neuron (Cambridge, Mass.), v 83(4), pp 934-943
20 Aug 2014
PMID: 25123308
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Spinal circuits generate locomotion with variable speed as circumstances demand. These circuits have been assumed to convey equal and uniform excitation to all motoneurons whose input resistance dictates their activation sequence. However, the precise connectivity pattern between excitatory pre-motor circuits and the different motoneuron types has remained unclear. Here, we generate a connectivity map in adult zebrafish between the V2a excitatory interneurons and slow, intermediate, and fast motoneurons. We show that the locomotor network does not consist of a uniform circuit as previously assumed. Instead, it can be deconstructed into three separate microcircuit modules with distinct V2a interneuron subclasses driving slow, intermediate, or fast motoneurons. This modular design enables the increase of locomotor speed by sequentially adding microcircuit layers from slow to intermediate and fast. Thus, this principle of organization of vertebrate spinal circuits represents an intrinsic mechanism to increase the locomotor speed by incrementally engaging different motor units.
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Details
- Title
- Separate Microcircuit Modules of Distinct V2a Interneurons and Motoneurons Control the Speed of Locomotion
- Creators
- Konstantinos Ampatzis - Karolinska InstitutetJianren Song - Karolinska InstitutetJessica Ausborn - Karolinska InstitutetAbdeljabbar El Manira - Karolinska Institutet
- Publication Details
- Neuron (Cambridge, Mass.), v 83(4), pp 934-943
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- Karolinska Institute; Karolinska Institutet Swedish Research Council; Swedish Research Council for Health Working Life & Welfare (Forte); Swedish Research Council Formas StratNeuro
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:000340479600019
- Scopus ID
- 2-s2.0-84907597053
- Other Identifier
- 991020655545204721
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- Web of Science research areas
- Neurosciences