Which of the following structures of the adult heart is a remnant of the foramen ovale in the fetal heart?
  1. Crista terminalis
  2. Fossa ovalis
  3. Sulcus terminalis
  4. Right auricle
Explanation
Answer: B - The fossa ovalis, which lies on the atrial septum (separating the right and left atria), is the adult remnant of the fetal foramen ovale. Its upper margin is the anulus ovalis.
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