Definitions for "Extraocular muscles"
(eks-truh-AHK-yu-lur): Six muscles that move the eyeball.
Six muscles control eye movement. Five of these originate from the back of the orbit and wrap around the eye to attach within millimeters of the cornea. Four of these move the eye roughly up, down, left and right. Two muscles (one originating from the lower rim of the orbit) control the twisting motion of the eye (when the head is tilted).
six muscles (medial rectus, lateral rectus, superior rectus, inferior rectus, superior oblique, and inferior oblique) which serve to move an eye by rotating it about its vertical, horizontal, and antero-posterior axes