n*******t
发帖数: 1296 | 1 Effects of Superior Oblique Muscle on eye are depression and abduction, that
is, it can move eye temorally.
However if you look at one of the six cardinal positions of gaze, for
example, the one in which the right eye gazes nasally and downward while the
left eye gazes temoprally and downward (双眼向左下看), the EOM in effect on
right eye is Superior Oblique Muscle. In this gaze position, the right eye
is adducted (it gazes nasally), then how comes the superior oblique muscle
which is an abductor add | p********r
发帖数: 20 | 2 http://en.wikipedia.org/wiki/Superior_oblique_muscle
It is explained very well in this article.
The primary (main) action of the superior oblique muscle is intorsion, the
secondary action is depression (primarily in the adducted position) and the
tertiary action is abduction (lateral rotation).
The depressing action of superior oblique (making the eye look down towards
the mouth) is most effective when the eye is in an adducted position. This
is because as the eye is abducted (looks laterally), | n*******t
发帖数: 1296 | 3 Thank you for directing me to this information and it's very helpful.
What confused me most is that in any of the cardinal gaze positions there is
a single EOM involed in the movement of the eye (the definition of cardinal
gaze position). Apparently superior oblique along can not move the eye
inwards and downwards. The patient needs to look inwards first, a movement
directed by medial rectus, and then the superior oblique can exert its
depression effect to move the eye to an inwards and downwa
【在 p********r 的大作中提到】
: http://en.wikipedia.org/wiki/Superior_oblique_muscle
: It is explained very well in this article.
: The primary (main) action of the superior oblique muscle is intorsion, the
: secondary action is depression (primarily in the adducted position) and the
: tertiary action is abduction (lateral rotation).
: The depressing action of superior oblique (making the eye look down towards
: the mouth) is most effective when the eye is in an adducted position. This
: is because as the eye is abducted (looks laterally),
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