In cases of atrial septal defect (ASD), foramen ovale is formed by incomplete development of which one of the following structures?

[Joyce]

#january2020usmle2k

In cases of atrial septal defect (ASD), foramen ovale is formed by incomplete development of which one of the following structures?

A- Ostium primum
B- Ostium secundum
C- Septum primum
D- Septum secundum

 

[Tiffany Wong]

A- Ostium primum