The extraocular muscles (EOM) are the muscles responsible for moving and rotating the eye in a highly coordinated manner. The extraocular muscles include the levator palpebrae superioris, which allows for movement of the upper lid and the seven skeletal muscles that move the eye: the inferior rectus (IR); medial rectus (MR); superior oblique(SO); levator palpebrae (LP); superior rectus (SR); lateral rectus (LR); and retractor bulbi (RB).