(IMAGE (TYPE "GIF") (PATH "gifs/Syllabus Chapters/EyeMovements/eyemovements.gif")) (OUTLINE-COLOR (NAME "YELLOW")) (STRING-COLOR (NAME "RED")) (PIN-COLOR (NAME "YELLOW")) (FRAME-INFO (STRING "Eye Movements, General. \(Contributed by Dr. R. Thorne\). These diagrams show which muscles are active during particular eye movements. The top panel shows the insertions of the extraocular muscles. The lower panels highlight active muscles \(in red\) and the arrows show the direction of each muscle's pull. Under normal circumstances, both eyes move together \(conjugate eye movements\) so that the region of visual interest is imaged on the fovea of each eye. For example, to look to the right \(second panel\), the lateral rectus of the right eye and the medial rectus of the left eye are both active. Looking directly upward \(third panel\) requires activation of both the superior rectus and the inferior oblique. The inferior oblique counteracts the slight medial pull of the superior rectus. To focus on near objects, the eyes need to converge \(lower panel\). This convergence results from the activation of the medial rectus of each eye, aided by the superior obliques. 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