The roof of the IVth ventricle as a passage-way for cerebrospinal fluid.
D002552:Cerebral Ventricles / Q000502:physiology*; D002555:Cerebrospinal Fluid; D006321:Heart; D006352:Heart Ventricles; D006801:Humans; D009424:Nervous System Physiological Phenomena
CEREBRAL VENTRICLES/physiology; CEREBROSPINAL FLUID