期刊
JOURNAL OF NEUROSCIENCE
卷 34, 期 32, 页码 10756-10764出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1079-14.2014
关键词
dense coding; distributed neural network; scratch reflex; spinal cord; thoracic segments
资金
- Lundbeck Foundation
- Research Council of Lithuania project Promotion of Student Scientific Activities [VP1-3.1-SMM-01-V-02-003]
- Republic of Lithuania
- European Social Fund
In reduced preparations, hindlimb movements can be generated by a minimal network of neurons in the limb innervating spinal segments. The network of neurons that generates real movements is less well delineated. In an ex vivo carapace-spinal cord preparation from adult turtles (Trachemys scripta elegans), we show that ventral horn interneurons in mid-thoracic spinal segments are functionally integrated in the hindlimb scratch network. First, mid-thoracic interneurons receive intense synaptic input during scratching and behave like neurons in the hindlimb enlargement. Second, some mid-thoracic interneurons activated during scratching project descending axons toward the hindlimb enlargement. Third, elimination of mid-thoracic segments leads to a weakening of scratch rhythmicity. We conclude that densely innervated interneurons in mid-thoracic segments contribute to hindlimb scratching and may be part of a distributed motor network that secures motor coherence.
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