The cerebrospinal fluid-filled spaces inside the brain.
hog:0001725
hog:0000006 fourth ventriclehog:0000007 third ventriclehog:0000643 telencephalic ventriclehog:0000644 prosencephalic vesiclehog:0000832 cerebral aqueducthog:0001119 neural lumenhog:0001224 brain ventricular zonehog:0001377 choroid plexusBFO:0000050 part of
hog:0000293
tao:0001261