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Noun
1. fourth ventricle; brain structureAnatomy
Wikipedia definition
2. Fourth ventricleThe fourth ventricle is one of the four connected fluid-filled cavities within the human brain. These cavities, known collectively as the ventricular system, consist of the left and right lateral ventricles, the third ventricle, and the fourth ventricle. The fourth ventricle extends from the cerebral aqueduct (aqueduct of Sylvius) to the obex, and is filled with cerebrospinal fluid (CSF). The fourth ventricle has a characteristic diamond shape in cross-sections of the human brain.
Read “Fourth ventricle” on English Wikipedia
Read “第四脳室” on Japanese Wikipedia
Read “Fourth ventricle” on DBpedia

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