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refers to a composite, fluid-filled substructure of the brain that includes the left lateral ventricle and the right lateral ventricle of the endbrain. Each lateral ventricle connects via an interventricular foramen to the third ventricle. The third ventricle, which separates the left and right parts of the interbrain, connects via the cerebral aqueduct to the fourth ventricle. The fourth ventricle, in turn, connects to the central canal of the spinal cord. They are intercommunicating cavities that contain cerebrospinal fluid ( Carpenter-1983 ).
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