 | Ocular Motility Disorders |
Figure 1 : Orbital CT anatomy. Direct parasagittal CT scan of cadaver head shows peripheral orbital space (ps); central orbital (intraconal) space (CS); optic nerve; superior rectus muscle (S) and inferior rectus muscle (I); inferior oblique muscle (IO); orbital septum (curved arrow); and common tendon of Zinn (arrows). Periosteum (periorbita) lines bony orbit as orbital fascia and is loosely attached to bony orbit. Periosteum is united with dura mater and sheath of optic nerve at optic canal. Normally, periosteum cannot be differentiated from adjacent soft tissues. Periosteum is continuous with periosteum of the bones of the face and is also continuous with layer of dura at superior orbital fissure. Note continuity of periorbita with periosteum of pterygomaxillary fossa (PF). Infection or infiltrative process of pterygomaxillary fossa may invade orbital subperiosteal space (periorbita) or vice versa. (CT scan courtesy of FW Zonneveld.) (From Mafee MF et al. Orbital space-occupying lesions: role of CT and MRI: an analysis of 145 cases. Radiol Clin North Am 1987;25:529.)
Six striated EOMs, including four recti and two oblique muscles, control eye movement (Fig. 1, Fig. 2)
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