Multiple choice

Pulmonary aorta in mammalian embryo communicates with aorta by a thin vessel called ductus arteriosus, which later closes and remains in adult as

  1. fossa ovalis

  2. ligamentum arteriosus

  3. carotico-pulmonary aperture

  4. none of the above

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B Correct answer
Explanation

After birth, the ductus arteriosus (a fetal shunt between pulmonary artery and aorta) closes and becomes the ligamentum arteriosum, a fibrous connective tissue remnant. The fossa ovalis is the remnant of the foramen ovale (atrial septal defect).

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