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  1. #1
    YuQX is offline Junior Member 510 points
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    Question about extraocular muscles

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    Can anybody tell me the location and function of inferior oblique and superior oblique? It's so confusing for me.

  2. #2
    wcb22 is offline Elite Member
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    the inferior oblique muscle crosses "obliquely" on the inferior aspect of the eye. CN III innervates it. I believe it moves the eye superiorly and lateral.

    the superior oblique muscle crosses "obliquely" on the superior aspect of the eye. CN IV innervates it. it moves the eye lateral and INFERIOR.

    this can be confusing because it's action is opposite to it's location, as opposed to the superior and inferior RECTUS.

    LR6 SO4 R3

    helpful mneumonic... all you have to do is memorize abducens (CN VI), and trochlear (CN IV) and all the rest are oculormotor (CN III).

    boards likes you to know that a person with a CN IV injury have trouble seeing WALKING DOWN THE STAIRS, and it's the smallest CN, and it exits the brainstem dorsally (it's the only one that does this).
    M.D., PGY-3 Internal Medicine

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    YuQX is offline Junior Member 510 points
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    Thank you for your information.
    I think I saw somewhere like you said: Function of inferior oblique is moving eye up and lateral, superior oblique moves eye down and lateral. But in HY Anatomy said: Inferior oblique moves eye up and in and superior oblique moves eye down and in. So, both muscles move eye medially or laterally?

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    md90's Avatar
    md90 is offline Senior Member
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    Inferior oblique moves eye up and in and superior oblique moves eye down and in. So, both muscles move eye medially or laterally
    Inferior Oblique (CN III): up and laterally

    Superior oblique (CN IV): down and medially

    Superior Rectus (CN III): up

    Inferior Rectus (CN III): down

    Lateral Rectus (CN VI): lateral or abduction

    Medial Rectus (CN III): medial or adduction
    Last edited by md90; 06-23-2006 at 06:08 PM.
    "SLAM-DUNK THE STEPS"

    “Peace, it does not mean to be in a place where there is no noise, no trouble, or no hard work…..it means to be in the midst of those things and still be calm in your
    heart.”

  5. #5
    YuQX is offline Junior Member 510 points
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    Gohs, md90 got another version for two oblique muscles. It seems nobody doubts about superior moving eye down and the inferior moving eye up. It's just not clear that they move eyes laterally or medially. I think HY Anatomy even shows the position of inferior oblique wrong (Page 182) as well.
    Although it is still not clear for my question, I still need thank you two for the help!

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    YuQX is offline Junior Member 510 points
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    I think md90 got the right version. People using HY Anatomy should change the information on page 182.
    Last edited by YuQX; 06-09-2006 at 10:12 AM.

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    md90's Avatar
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    think where the muscle is...

    think of where the extraocular muscle is located and then think of the postion/function of that muscle... here's a picture to better illustrate (sorry but I'm a visual learner and love pictures)


    Both of the oblique muscles are located nasally located, along with medial rectus whereas the other rectus muscles (lateral, inferior, and superior) are temporally located. The oblique muscles have another function b/c of the way the muscles are positioned... they can intort/extort.. meaning that they "roll" around in the eye socket...Superior intorts, Inferior extorts..

    Hope that this helps...
    "SLAM-DUNK THE STEPS"

    “Peace, it does not mean to be in a place where there is no noise, no trouble, or no hard work…..it means to be in the midst of those things and still be calm in your
    heart.”

  8. #8
    YuQX is offline Junior Member 510 points
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    Quote Originally Posted by md90
    think of where the extraocular muscle is located and then think of the postion/function of that muscle... here's a picture to better illustrate (sorry but I'm a visual learner and love pictures)


    Both of the oblique muscles are located nasally located, along with medial rectus whereas the other rectus muscles (lateral, inferior, and superior) are temporally located. The oblique muscles have another function b/c of the way the muscles are positioned... they can intort/extort.. meaning that they "roll" around in the eye socket...Superior intorts, Inferior extorts..

    Hope that this helps...
    Excellent picture! I hope Lippincott Williams and Wikins can see this picture, so they can replace their rubbish picture from HY Anatomy, which confused me lots.
    The location and function of inferior oblique and superior oblique really make sense here because they are just opposite, one moves eye up and out, another one move eye down and in, one located at up, another is down.
    Thank lots!

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    wcb22 is offline Elite Member
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    anatomy

    snell anatomy is wrong... yikes, and once i get it in my head, it's hard to get it out.
    M.D., PGY-3 Internal Medicine

  10. #10
    YuQX is offline Junior Member 510 points
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    It seems we can't rely on those review material much. Those people just rush to publish their books to make money from people like us. I can't believe it, this is so big mistake, they publish it again and publish.

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