| Name: | brain | 
|---|---|
| Synonyms: | brain structure | 
| Definition: | Cavitated compound organ which is comprised of gray and white matter and surrounds the cerebral ventricular system. | 
| Ontology: | Anatomy Ontology [ZFA:0000008] | 
| Name: | oligodendrocyte | 
|---|---|
| Synonyms: | oligodendroglia | 
| Definition: | A class of large neuroglial (macroglial) cells in the central nervous system. Form the insulating myelin sheath of axons in the central nervous system. | 
| Ontology: | Anatomy Ontology [ZFA:0009076] |