<unk>  is a structure in the developing heart of the human embryo that<unk>  the right atrium in a way such that it creates a pan systolic murmur in the same way as the foramen ovale. Recognition of the absence of this murmur can indicate a potentially terminal cardiac defect in the newborn.
Crista dividens
Surfer's knots
Wale mark
Vossius ring
Buddy wrapping
Cramp-ring
Phrygian cap 
Kerley lines