The cerebral aqueduct (aqueduct of Sylvius) is a narrow canal within the brain stem and just in front of the cerebellum. It connects the fourth ventricle to the third ventricle and passes lengthwise through the brain stem. This ventricle is contiguous with the central canal of the spinal cord and has openings in its roof that lead into the meninges (membranes that cover the brain and spinal cord).
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