MCQ IN MEDICINE

Detailed explanation-1: -First aortic arch-regresses early, but a remnant forms a portion of the maxillary artery. Second aortic arch-regresses early, but a remnant forms portions of the hyoid and stapedial arteries.

Detailed explanation-2: -Part of the maxillary artery arises from the remnant of the first aortic arch. In general the first and second part of the aortic arch regress and do not remain to form into any permanent anatomical structures.

Detailed explanation-3: -Three branches, the brachiocephalic trunk, left common carotid artery and left subclavian artery usually branch from the aortic arch. These branches may branch from the beginning of the arch or the upper part of the ascending aorta by varying distances between them.