Image Based Question – 65154

All are true regarding the structure marked with arrow except:

A. Pulmonary artery develops from 6th arch

B. Maxillary artery derives from 1st arch

C. All 6 arches are not present simultaneously

D. 5th arch is absent in 5% of embryos

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Correct Answer » D Explanation

Ans;D. 5th arch is absent in 5% of embryos

This structure is Arch of aorta

• All 6 aortic arches are not present simultaneously. In 50% of embryos 5°’ arch is never formed.

• There is formation of maxillary artery from 1st arch;

• Hyoid & stapedial arteries from 2nd arch; common,

• Internal & external carotid from 3rd arch;

• Arch of aorta & right subclavian artery from left & right 4th arch respectively;

• Pulmonary artery from 6th aortic arch