Term Name:	fourth ventricle
Synonyms:	4th ventricle, fourth ventricle proper, hindbrain ventricle, IVth ventricle, rhombencephalic ventricle, rhombencephalic vesicle, ventricle IV, ventricle of hindbrain, ventricle of rhombencephalon, ventriculus quartus
Definition:	Part of the ventricular system of the brain, forming a single large irregularly shaped cavity located on the midline of the rhombencephalon, between the medulla, pons and the isthmus ventrally and the cerebellum dorsally. It is continuous with the cerebral aqueduct anteriorally and the central canal of the spinal cord posteriorly. It communicates with the subarachnoid space through its lateral and median apertures.
Ontology:	Cell Ontology [UBERON:0002422]