Fig. 10. Structure of orbital connective tissues and their relation to the fiber layers of the rectus extraocular muscles. Coronal views are represented at levels indicated by arrows in horizontal section. IO, inferior oblique; IR, inferior rectus; LPS, levator palpebrae superioris; LR, lateral rectus; MR, medial rectus; SO, superior oblique; SR, superior rectus. (Demer JL, Oh SY, Poukens V: Evidence for active control of rectus extraocular muscle pulleys. Invest Ophthalmol Vis Sci 2000;41:1280–1290.)