NEET PG Medical – 2015 – Question – 50
Ligamentum arteriosum is derived from:
a) Ductus arteriosus
b) Ductus venosus
c) Ductus utriculosaccularis
d) Ductus reunions
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Correct Answer – A
Ans. A: Ductus arteriosus
The ductus arteriosus represents the distal portion of the sixth left aortic arch and connects the left pulmonary artery to the beginning of the descending aorta.
- During fetal life, blood passes through it from the pulmonary artery to the aorta, thus bypassing the lungs.
- After birth, it normally constricts, later closes, and becomes the ligamentum arteriosum.
- A persistent patent ductus arteriosus results in high-pressure aortic blood passing into the pulmonary artery, which raises the pressure in the pulmonary circulation.
- A patent ductus arteriosus is life threatening and should be ligated and divided surgically.
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