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Comparative extraocular muscle blood flow

L M Wilcox, E M Keough, R J Connolly

    The Journal of Experimental Zoology
    |January 1, 1981
    PubMed
    Summary
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    This study quantifies extraocular muscle (EOM) blood flow in various animals. Findings reveal EOM blood flow varies significantly, suggesting a link to ocular motility, not a universal high-flow property.

    Area of Science:

    • Comparative Physiology
    • Ocular Anatomy
    • Cardiovascular Research

    Background:

    • Extraocular muscles (EOM) are crucial for eye movement.
    • Understanding EOM blood flow is vital for ophthalmology and comparative physiology.
    • Previous research has not comprehensively quantified EOM blood flow across diverse species.

    Purpose of the Study:

    • To quantitatively determine blood flow to the extraocular muscles (EOM) in animals with varying ocular motility.
    • To compare EOM blood flow rates across different species, including primates, dogs, sheep, and geese.
    • To investigate the relationship between EOM blood flow and functional ocular motility.

    Main Methods:

    • Utilized the Reference Sample Method with 103Ru microspheres (15 +/- 3 micrometers).

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  • Conducted complete cardiovascular monitoring during blood flow measurements.
  • Quantitatively determined blood-flow values (ml/minute/gm) for EOM in primates, dogs, sheep, and geese.

    • Main Results:

    • Mammalian EOM blood flow was significantly higher than in other skeletal muscles.
    • EOM blood flow in sheep (0.12 +/- 0.01 ml/min/gm) was significantly lower than in primates and dogs.
    • Avian EOM showed no significant blood flow difference compared to other skeletal muscles, reflecting unique avian ocular anatomy.

    Conclusions:

    • High blood flow is not a general characteristic of all extraocular muscles.
    • EOM blood flow exhibits species-specific variations.
    • A correlation between functional ocular motility and EOM blood flow is suggested by the data.