Which term designates the four extraocular muscles that move the eye up, down, left, and right?

Prepare for the VisionFirst CEBT Test. Utilize flashcards and multiple-choice quizzes, each offering hints and detailed explanations for optimized learning. Excel in your exam!

Multiple Choice

Which term designates the four extraocular muscles that move the eye up, down, left, and right?

Explanation:
The four straight muscles that move the eye in straight vertical and horizontal directions are the rectus muscles. They consist of the superior, inferior, medial, and lateral rectus, which pull the eyeball upward, downward, toward the nose, and toward the temple, respectively. These straight fibers align to produce clean, non-rotational movements in the cardinal directions, while the oblique muscles handle rotation and work with the recti to refine gaze. The other terms aren’t responsible for moving the eye in those straight directions: the retina is the light-sensitive layer at the back of the eye, the pupil is the opening that regulates light entry, and the semilunar fold is a small conjunctival fold near the inner corner of the eye.

The four straight muscles that move the eye in straight vertical and horizontal directions are the rectus muscles. They consist of the superior, inferior, medial, and lateral rectus, which pull the eyeball upward, downward, toward the nose, and toward the temple, respectively. These straight fibers align to produce clean, non-rotational movements in the cardinal directions, while the oblique muscles handle rotation and work with the recti to refine gaze.

The other terms aren’t responsible for moving the eye in those straight directions: the retina is the light-sensitive layer at the back of the eye, the pupil is the opening that regulates light entry, and the semilunar fold is a small conjunctival fold near the inner corner of the eye.

More practice questions