The orb is attached to the orbit by 6 muscles. Muscles are double. Rectus muscle and oblique muscle.
1. Rectus muscle: 4 rectus muscles.
(i) Lateral Rectus Muscle : It helps rotate the eyeball outwards.
(ii) Medial rectus muscle : It helps in inward rotation of the eyeball.
(iii) Superior rectus muscle : It helps the eyeball to rotate upwards.
(iv) Inferior rectus muscle: It helps the eyeball to rotate downwards.
2. Oblique muscles: 2 oblique muscles.
(i) Superior oblique muscle: It helps the eyeball to rotate along the axis between the optic nerve and the cornea.
(ii) Inferior Oblique Muscle: It acts opposite to the superior oblique muscle.