Term: pericardium anatomical surface
Name: pericardium
Synonyms: pericardial sac
Definition: Serous membrane that surrounds the heart.
Ontology: Anatomy Ontology [ZFA:0000054]

Name: anatomical surface
Synonyms: surface
Definition: A 2D surface of an anatomical continuant.
Ontology: Spatial Ontology [BSPO:0000005]