transverse septum

trans·verse sep·tum

1. Synonym(s): ampullary crest2. the mesodermal mass separating the pericardial and peritoneal cavities; it is covered with mesothelium except where intimately associated with the liver, which originally develops within it; the septum is definitively incorporated into the diaphragm as the central tendon.

transverse septum

(1) Ampullary crest; crista ampullaris [NA6].
(2) The mesodermal tissue that separates the pericardial and peritoneal cavities.