Image Based Question – 74408

As shown in the figure, abnormal subclavian artery develops as a result of:

A. Persistence of B

B. Persistence of A

C. Obliteration of A with persistence of B

D. Obliteration of B with persistence of A

Correct Answer » D Explanation

Ans: D. Obliteration of B with persistence of A

(Ref Langman’s 13/e p206)

• Abnormal subclavian artery develops as a result of obliteration of B (4th arch) with persistence of A (distal portion of right dorsal aorta & 7th intersegmental artery).