The ligamentum arteriosum, attached to the concavity of the aortic arch, connects the arch to which structure?
- A Right pulmonary artery
- B Root of the left pulmonary artery ✓
- C Superior aspect of the left main bronchus
- D Ascending aorta just distal to the aortic valve
Correct answer: B. Root of the left pulmonary artery
Explanation
The ligamentum arteriosum is the fibrous remnant of the fetal ductus arteriosus and extends from the root of the left pulmonary artery to the inferior surface of the aortic arch. It carries no significant flow after birth, and its persistence as a patent ductus arteriosus produces a continuous machinery murmur. It attaches to the left pulmonary artery, never the right, and lies near the left recurrent laryngeal nerve.
Reference: Gray's Anatomy for Students, 4th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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