| Term: | fourth ventricle ventral region | 
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| Note: | This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked name. | 
| Name: | fourth ventricle | 
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| 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: | ventral region | 
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| Synonyms: | |
| Definition: | Anatomical region ventrally located on the body or body part. | 
| Ontology: | Spatial Ontology [BSPO:0000084] |