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  • Title: Timing of knee-related spinal neurons during fictive rostral scratching in the turtle.
    Author: Stein PS, Daniels-McQueen S.
    Journal: J Neurophysiol; 2003 Dec; 90(6):3585-93. PubMed ID: 12968015.
    Abstract:
    Knee-flexor motor activity rhythmically alternated with knee-extensor motor activity during fictive rostral scratching in the spinal turtle. A critical transition from knee-flexor motor activity to knee-extensor motor activity occurred during hip-flexor motor activity. A key feature of this transition was that the end-phases of knee-flexor motor activity were positively correlated with the start-phases of knee-extensor motor activity. We studied spinal interneurons with activities related to this transition. We previously used single-unit recording techniques to characterize a data set of descending propriospinal interneurons during rostral scratching. We focused here on a group of interneurons from this data set with start-phases (on-units) or with end-phases (off-units) near the start of knee-extensor motor activity. We showed that, for a subset of these units, the start-phases of on-units and the end-phases of off-units were positively correlated with the start-phases of knee-extensor motor activity. We present the hypothesis that some of these knee-related on- and off-units may play a role in timing knee motor activity during rostral scratching.
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