During embryological development, the left fourth aortic arch forms which adult structure?
- A Pulmonary arteries
- B Brachiocephalic trunk
- C Arch of the aorta ✓
- D Right subclavian artery
Correct answer: C. Arch of the aorta
Explanation
The left fourth aortic arch forms the arch of the aorta. The right fourth aortic arch forms the proximal right subclavian artery. The sixth aortic arch forms the pulmonary arteries and the ductus arteriosus. The third aortic arch forms the common carotid arteries and the proximal internal carotid arteries.
Reference: Langman's Medical Embryology, 14th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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