(... is part of cerebrospinal fluid) one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
(... is part of cerebrospinal fluid) a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region