Which muscles act directly up and down or right and left, consisting of four muscles: superior, medial, inferior, and lateral?

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Multiple Choice

Which muscles act directly up and down or right and left, consisting of four muscles: superior, medial, inferior, and lateral?

Rectus muscles are the eye muscles that move the eye in straight up/down or left/right directions. There are four of them: the superior rectus pulls the eye upward, the inferior rectus pulls it downward, the medial rectus pulls it toward the nose, and the lateral rectus pulls it away from the nose. They attach to the eyeball in a straight line and work together to point the gaze in the four primary directions. The oblique muscles handle rotation and tilt, but the straight rectus group is what moves the eye directly up, down, left, or right. The other options—retina, pupil, and pterygium—are parts or conditions of the eye and don’t produce these straight-line movements.

Rectus muscles are the eye muscles that move the eye in straight up/down or left/right directions. There are four of them: the superior rectus pulls the eye upward, the inferior rectus pulls it downward, the medial rectus pulls it toward the nose, and the lateral rectus pulls it away from the nose. They attach to the eyeball in a straight line and work together to point the gaze in the four primary directions. The oblique muscles handle rotation and tilt, but the straight rectus group is what moves the eye directly up, down, left, or right. The other options—retina, pupil, and pterygium—are parts or conditions of the eye and don’t produce these straight-line movements.

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