| Name: | fourth ventricle |
|---|---|
| Synonyms: | 4th ventricle, hindbrain ventricle, rhombencephalic ventricle, rhombencephalic vesicle, ventricle IV, ventriculus rhombencephali |
| Definition: | Fluid-filled brain cavity. Most posterior brain ventricle. |
| Ontology: | Anatomy Ontology [ZFA:0000110] |
| Name: | decreased size |
|---|---|
| Synonyms: | hypoplasia, small, tiny, underdeveloped |
| Definition: | A size quality which is relatively low. |
| Ontology: | Phenotypic Quality Ontology [PATO:0000587] |