Term: brain grey matter
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: grey matter
Synonyms: gray mater, gray matter
Definition: Multi-tissue comprised of neurons, dendrites, axon terminals, glial cells, and capillaries.
Ontology: Anatomy Ontology [ZFA:0001681]