part of part of brain ventricle/choroid plexus brain ventricle EMAPA:32674 EMAPA:32675 one of the system of communicating cavities in the brain that are continuous with the central canal of the spinal cord, that like it are derived from the medullary canal of the embryo, that are lined with an epithelial ependyma, and that contain a serous fluid HBA:9418 Organ cavity of the brain which consists of the lateral ventricles, the third and fourth ventricles and the cerebral aqueduct[NIFSTD:birnlex_1356]. FMA draws the distinction between e.g. 'fourth ventricle' and 'cavity of fourth ventricle'. The latter is a cavity, and part of the former, which is a region. The superclass of 'fourth ventricle' is_a 'region of ventricular system of the brain'. We place this class here, although it is not equivalent to ventricles, as it includes ventricle bodies. region of ventricular system of brain brain ventricles FMA:78447 BTO:0001442 MA:0000818 UBERON:0004086 OpenCyc:Mx4rvmTY65wpEbGdrcN5Y29ycA uberon UMLS:C0007799 MESH:D002552 EFO:0001914 cerebral ventricle ventricular system of brain ventricle of nervous system