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Differential lateral rectus compartmental contraction during ocular counter-rolling.

Robert A Clark1, Joseph L Demer

  • 1Department of Ophthalmology, University of California, Los Angeles, CA 90095-7002, USA.

Investigative Ophthalmology & Visual Science
|March 20, 2012
PubMed
Summary

The lateral rectus muscle shows distinct compartmental activity during head tilts, contributing to the torsional vestibulo-ocular reflex. This finding supports specialized function within extraocular muscles.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Biomechanics

Background:

  • Extraocular muscles (EOMs) like the lateral rectus (LR) and medial rectus (MR) possess distinct innervation territories.
  • This suggests potential functional specialization within different compartments of these muscles.

Purpose of the Study:

  • To investigate differential compartmental activity in rectus EOMs during head tilt using MRI.
  • To understand the role of these compartments in ocular counter-rolling, a key component of the vestibulo-ocular reflex (VOR).

Main Methods:

  • Magnetic resonance imaging (MRI) was employed in 12 healthy adults during 90° head tilts.
  • Cross-sections and posterior partial volumes of rectus EOMs were analyzed in 2mm thick quasi-coronal planes to assess contractility.

Main Results:

  • Horizontal rectus EOMs exhibited significantly greater posterior volumes and cross-sections in their inferior compartments.
  • Contractile changes in the LR were more pronounced in the inferior compartment during head tilts, suggesting selective activation.
  • Vertical rectus EOMs showed no significant compartmental contractile changes.

Conclusions:

  • Selective activation of LR and possibly MR compartments correlates with segregated intramuscular innervation.
  • This compartmentalization likely contributes to non-commutative torsion observed during the VOR.