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(fusimotor)
726 results
  • Dental occlusion as one cause of tinnitus. [Journal Article]
    Med Hypotheses 2019; 130:109280Villaça Avoglio JL
  • There is large support in literature linking tinnitus to dental occlusion and temporomandibular joint disorders (TMD). However, there is no model to explain such a link. This hypothesis explains how the fusimotor system of the muscles innervated by the trigeminal motor nucleus is affected by inadequacies in the occlusion of the teeth that cause changes in posture and movement of the mandible. Rep…
  • Seeing Your Foot Move Changes Muscle Proprioceptive Feedback. [Journal Article]
    eNeuro 2019 Mar-Apr; 6(2)Ackerley R, Chancel M, … Kavounoudias A
  • Multisensory effects are found when the input from single senses combines, and this has been well researched in the brain. Presently, we examined in humans the potential impact of visuo-proprioceptive interactions at the peripheral level, using microneurography, and compared it with a similar behavioral task. We used a paradigm where participants had either proprioceptive information only (no vis…
  • Acetylcholine receptors in the equatorial region of intrafusal muscle fibres modulate mouse muscle spindle sensitivity. [Journal Article]
    J Physiol 2019; 597(7):1993-2006Gerwin L, Haupt C, … Kröger S
  • CONCLUSIONS: Acetylcholine receptors are aggregated in the central regions of intrafusal muscle fibres. Single unit muscle spindle afferent responses from isolated mouse extensor digitorum longus muscle were recorded in the absence of fusimotor input to ramp and hold stretches as well as to sinusoidal vibrations in the presence and absence of the acetylcholine receptor blockers d-tubocurarine and α-bungarotoxin. Proprioceptive afferent responses to both types of stretch were enhanced in the presence of either blocker. Blocking acetylcholine uptake and vesicular acetylcholine release by hemicholinium-3 also enhanced stretch-evoked responses. These results represent the first evidence that acetylcholine receptors negatively modulate muscle spindle responses to stretch. The data support the hypothesis that the sensory nerve terminal is able to release vesicles to fine-tune proprioceptive afferent sensitivity.
  • The neural basis of the senses of effort, force and heaviness. [Review]
    Exp Brain Res 2019; 237(3):589-599Proske U, Allen T
  • Effort, force and heaviness are related terms, having in common that they are all sensations associated with the generation of voluntary muscle contractions. Traditionally they have been thought to originate in the brain, as a result of copies of motor commands relayed to sensory areas. A stumbling block for the central hypothesis has been the lack of proportionality between the fall in muscle fo…
  • Functional properties of human muscle spindles. [Review]
    J Neurophysiol 2018; 120(2):452-467Macefield VG, Knellwolf TP
  • Muscle spindles are ubiquitous encapsulated mechanoreceptors found in most mammalian muscles. There are two types of endings, primary and secondary, and both are sensitive to changes in muscle length and velocity, with the primary endings having a greater dynamic sensitivity. Unlike other mechanoreceptors in the somatosensory system, muscle spindles are unique in possessing motor innervation, via…
  • Functional analysis of human intrafusal fiber innervation by human γ-motoneurons. [Journal Article]
    Sci Rep 2017; 7(1):17202Colón A, Guo X, … Hickman JJ
  • Investigation of neuromuscular deficits and diseases such as SMA, as well as for next generation prosthetics, utilizing in vitro phenotypic models would benefit from the development of a functional neuromuscular reflex arc. The neuromuscular reflex arc is the system that integrates the proprioceptive information for muscle length and activity (sensory afferent), to modify motoneuron output to ach…
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