FMA definition : " Organ cavity subdivision that is a part of a serous cavity, demarcated from other serous cavity subdivisions by one or more anatomical structures or anatomical surfaces; together with other serous cavity subdivisions, it constitutes the serous cavity. Examples: costodiaphragmatic recess, oblique sinus of pericardial cavity, lesser sac, suprapatellar bursal space."

http://www.semanticweb.org/ontologies/epo.owl#SerousSacSubdivisionCavity

FMA definition : " Organ cavity subdivision that is a part of a serous cavity, demarcated from other serous cavity subdivisions by one or more anatomical structures or anatomical surfaces; together with other serous cavity subdivisions, it constitutes the serous cavity. Examples: costodiaphragmatic recess, oblique sinus of pericardial cavity, lesser sac, suprapatellar bursal space."

epo:SerousSacSubdivisionCavity

cavity of subdivision of serous sac

http://www.semanticweb.org/ontologies/2009/3/ontoDPN.owl#OrganCavitySubdivision