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- W2020757117 abstract "Motoneurons in the primate oculomotor nucleus can be divided into two categories, those supplying twitch muscle fibers and those supplying nontwitch muscle fibers. Recent studies have shown that twitch motoneurons lie within the classical oculomotor nucleus (nIII), and nontwitch motoneurons lie around the borders. Nontwitch motoneurons of medial and inferior rectus are in the C group dorsomedial to nIII, whereas those of inferior oblique and superior rectus lie near the midline are in the S group. In this anatomical study, afferents to the twitch and nontwitch subgroups of nIII have been anterogradely labeled by injections of tritiated leucine into three areas and compared. 1) Abducens nucleus injections gave rise to silver grain deposits over all medial rectus subgroups, both twitch and nontwitch. 2) Laterally placed vestibular complex injections that included the central superior vestibular nucleus labeled projections only in twitch motoneuron subgroups. However, injections into the parvocellular medial vestibular nucleus (mvp), or Y group, resulted in labeled terminals over both twitch and nontwitch motoneurons. 3) Pretectal injections that included the nucleus of the optic tract (NOT), and the olivary pretectal nucleus (OLN), labeled terminals only over nontwitch motoneurons, in the contralateral C group and in the S group. Our study demonstrates that twitch and nontwitch motoneuron subgroups do not receive identical afferent inputs. They can be controlled either in parallel, or independently, suggesting that they have basically different functions. We propose that twitch motoneurons primarily drive eye movements and nontwitch motoneurons the tonic muscle activity, as in gaze holding and vergence, possibly involving a proprioceptive feedback system. J. Comp. Neurol. 479:117–129, 2004. © 2004 Wiley-Liss, Inc." @default.
- W2020757117 created "2016-06-24" @default.
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- W2020757117 creator A5022927206 @default.
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- W2020757117 date "2004-09-27" @default.
- W2020757117 modified "2023-09-27" @default.
- W2020757117 title "Twitch and nontwitch motoneuron subgroups in the oculomotor nucleus of monkeys receive different afferent projections" @default.
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- W2020757117 doi "https://doi.org/10.1002/cne.20296" @default.
- W2020757117 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15452829" @default.
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