part of part of location of location of develops from develops from surrounded by surrounded by luminal space of pericardial cavity EMAPA:16131 A potential space between the visceral and parietal layers of the pericardium. EMAPA:16132 uberon UBERON:0001074 SCTID:362027001 TAO:0002220 check ZFA, should actually be thoracic cavity. Note that Hyman defines the cavity as the space between the heart and the sac (but defines the sac as parietal) galen:PericardialSpace Wikipedia:Pericardial_cavity Anatomical space in which the heart is located and is surrounded by the pericardium.[TAO] cavitas pericardiaca UMLS:C0225972 MA:0000053 pericardial space EHDAA2:0001434 VHOG:0000556 ZFA:0001655 cavity of pericardial sac NCIT:C38662 In hagfishes a transverse septum extends upward from the ventral body wall posterior to the heart, partly separating an anterior pericardial cavity from a larger peritoneal cavity. (...) These basic relationships have not been modified by urodeles. The small pericardial cavity remains far forward where it is separated by a transverse septum from the principal coelom, which may now be called a pleuroperitoneal cavity because slender lungs are present. (...) The heart (of other tetrapods) is separated from the lungs (and liver if present) by more or less horizontal partitions that have their origin in the embryo as folds on the serous membrane of the right and left lateral body walls. These grow out to join in the midline of the body. They are called lateral mesocardia (birds) or pleuropericardial membranes. Posteriorly they join the transverse septum to form the adult pericardial membrane, or pericardium. (...) In their partitioning of their coelom, embryonic mammals resemble first early fishes (incomplete partition, posterior to heart, consisting of the transverse septum) and then reptiles (pericardium derived from transverse septum and pleuropericardial membranes). Mammals then separate paired pleural cavities from the peritoneal cavity by a diaphragm. The ventral portion of this organ comes from the transverse septum. The dorsal portion is derived from the dorsal mesentery and from still another pair of outgrowths from the lateral body wall, the pleuroperitoneal membranes.[well established][VHOG] BSA:0000091 FMA:11350 coelemic cavity lumen serous pericardium pericardial sac pericardial fluid anatomical cavity intraembryonic coelom serous cavity