aortic isthmus(redirected from isthmus of aorta)
a slight constriction of the aorta immediately distal to the left subclavian artery at the point of attachment of the ductus arteriosus.
A constriction in the fetal aorta between the ductus arteriosus and the left subclavian artery. The condition sometimes persists into adulthood.
See also: isthmus