Abstract
Crosstalk proposal: There is much to gain from the independent control of human muscle spindles.
Highlights
Muscle spindles are encapsulated sensory organs found in most of our skeletal muscles
It is well known that spindles respond to muscle stretch and contribute to proprioception, but these mechanoreceptors are interesting because they have their own motor supply
Fusimotor neurons allow for the independent control of muscle spindles
Summary
Crosstalk proposal: There is much to gain from the independent control of human muscle spindles. Most human spindle afferent data have been recorded under passive/relaxed conditions, isometric contractions or during very slow active movements in contexts that would tend to favour α-linked fusimotor activity This limited behavioural repertoire has been put forward as a potential cause for the observed discrepancy between human and feline spindle control Using newer technologies and pushing the envelope with human microneurography has recently allowed the debate concerning the nature of human fusimotor control to advance, as described below This short article emphasizes top-down fusimotor control, cutaneous afferent (‘reflexive’) projections to fusimotor neurons (Aniss et al 1990; Gandevia et al 1994) are potentially an important source of independent fusimotor control as well
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