Question

In a mammalian embryo, the pulmonary aorta communicates with carotid-systemic aorta by a narrow ductus arteriosus, in the adult this connection closes leaving

• A. Fossa -ovalis
• B. Carotico pulmonary aperture
• C. Ligamentum arteriosus
• D. None of the above

Answer 1

Answer: (C)

Ligamentum arteriosus

In the developing foetus, the ductus arteriosus also called the ductus Botalli, is a blood vessel connecting the pulmonary artery to the proximal descending aorta. It allows most of the blood from the right ventricle to bypass the foetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum. Ligamentum arteriosum is the remnant of ductus arteriosus. Ductus arteriosus is a small channel connecting the lumen of the two arches, which gets closed at the time of birth.

So, the correct answer is option C.