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Review Question - QID 215164

Branchial Apparatus Branchial arch derivatives QID: 215164 (M1.OMB.1)
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QID 215164 (Type "215164" in App Search)
A 6-day old infant boy is brought to a pediatrician for his first-week visit. He was born at 36 weeks' gestation to a 33-year-old G1P1 mother. His APGAR scores were 8 at 1 minute and 9 at 5 minutes, and initial evaluation was significant only for some dermal melanosis. His family history is significant for an uncle with immunodeficiency and a cousin who needed extensive facial reconstruction surgeries. A physical exam reveals a continuous polyphasic murmur but his parents say that no murmur was heard at birth. The most likely cause of this finding is derived from which of the following branchial arches?
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