part of part of anatomical space embryo interatrial septum foramen ovale of heart galen:ForamenOvaleCordis Wikipedia:Foramen_ovale_(heart) SCTID:362015004 An anatomical space in the fetal heart that allows blood to enter the left atrium from the right atrium. UMLS:C0016521 ostium secundum of Born foramen ovale cordis foramen ovale falx septi EHDAA2:0004142 It is one of two fetal cardiac shunts, the other being the ductus arteriosus (which allows blood that still escapes to the right ventricle to bypass the pulmonary circulation). Another similar adaptation in the fetus is the ductus venosus[WP] NCIT:C34241 In most individuals, the foramen ovale closes at birth. It later forms the fossa ovalis UBERON:0004754 Bottalo's foramen MA:0001873 FMA:86043 EMAPA:18244 foramen secundum