rei
Forum Elite
Topics: 67
Posts: 126
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some says that:
superior oblique (SO) depresses and abducts eyeball
superior rectus (SR) elevates and adducts eyeball
inferior oblique (IO) elevates and abducts eyeball
inferior rectus (IR) depresses and adducts eyeball
some says that
when the eyeball is adducted, SO depresses and IO elevates eyeball
when the eyeball is abducted, SR elevates and IR depresses eyeball
which one is correct? or are they contradictory??
thanks a lot.
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| Leopard
Forum Guru
Topics: 30
Posts: 401
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Both are correct
Second set is used to test different muscles of the eyeball.
The rationality behind iswith any muscle having different actions ,ity can perform only action at one time.
Suprior rectus has both actions
Adduction
Elevation of eye ball
Now if you full adduct the eye ball all fibers of superior rectus muscles are full contracted ,now they cannot elevate it. Now any other muscle should come in action to elevate it .So it is inferior oblique .
You can apply same formula to other muscles
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| rei
Forum Elite
Topics: 67
Posts: 126
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thank you very much
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| aml
Forum Senior
Topics: 5
Posts: 121
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SO depresses in adducted position.
SO helps LR in abduction.
but both actions cannot be done at the same time.
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| rei
Forum Elite
Topics: 67
Posts: 126
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so if the eye is in a central position, what muscle is responsible for elevating the eyeball, IO or SR?
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