DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Oculomotor nerve palsy. Face of a 36-year-old woman with third (III) nerve palsy after surgery to treat a subarachnoid haemorrhage. A berry aneurysm, a common localised dilation of an intercranial artery, caused the subarachnoid haemorrhage. III nerve palsy is a dysfunction of the third cranial nerve, the oculomotor nerve, which controls the movement of the eyes. It leads to an inability to move the eye, double vision, a fixed and non-reactive pupil and eyelid drooping (ptosis, seen here, right eye). Ptosis can be corrected by surgery.
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