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Extraocular muscle proprioceptors and proprioception.

G L Ruskell1

  • 1Department of Optometry and Visual Science, City University, London, UK.

Progress in Retinal and Eye Research
|April 7, 1999
PubMed
Summary

The role of proprioception in human eye movement perception is questioned due to structural anomalies in muscle spindles. Evidence suggests efference copy may be more critical for visual spatial perception than previously thought.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Sensory Physiology

Background:

  • The precise roles of proprioception and efference copy in visual spatial perception remain debated.
  • Recent physiological studies suggest proprioception collaborates with or serves temporal adaptations, while efference copy handles current visual perception.
  • Visuomotor cell characteristics in monkeys support the input of efference copy.

Purpose of the Study:

  • To investigate the structural basis for proprioception in human extraocular muscles.
  • To reconcile conflicting anatomical data regarding muscle afferents and their role in visual spatial perception.
  • To evaluate the contribution of proprioception versus efference copy in human visual spatial perception.

Main Methods:

  • Review and synthesis of anatomical data from human and animal studies on extraocular muscle innervation.
  • Detailed examination of human extraocular muscle spindles and neurotendonous endings.
  • Comparison of findings in humans with those in cats and monkeys.

Main Results:

  • Human extraocular muscles lack Golgi tendon organs; possess palisade and irregular nerve endings.
  • Neurotendonous endings have a limited, patchy distribution in humans and develop post-infancy.
  • Human muscle spindles exhibit structural anomalies, including atrophy of intrafusal fibers, questioning their proprioceptive capacity.

Conclusions:

  • Structural anomalies in human extraocular muscle spindles challenge their role in providing reliable proprioceptive information.
  • Findings question recent physiological studies supporting proprioception's role in visual spatial perception.
  • The data favor efference copy as a more significant mechanism for visual spatial perception in humans.

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