The eye balls are moved by six extrinsic muscles, attached at one end to the eyeball and other to the wall of the orbital cavity.

 They are :

(1) Medial rectus - The medial rectus rotates the eyeball inwards. 

(2) Lateral rectus - The lateral rectus rotates the eyeball outwards.

(3) Superior rectus - The superior rectus rotates the eyeball upwards.

(4) Inferior rectus - The inferor rectus rotates the eyeball downwards.

(5) Superior oblique - The superior oblique rotates the eyeball so that the cornea turns in downward and outward direction.

(6) Inferior oblique - The inferior oblique rotates the eyeballs so that cornea turns upwards and outwards.