Fig. 10. Insertion of eye muscles onto the right eye. Note position of the optic nerve (ON); its center is just above the horizontal meridian. Position of the macula (X); long ciliaries (C); vortex veins (V); superior oblique (SO); ora serrata (ORA); inferior oblique (IO); medial rectus (M); lateral rectus (L); inferior rectus (I); superior rectus (S). (Wolff E: Anatomy of the Eye and Orbit. 7th ed. Philadelphia: WB Saunders, 1976.)