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Drawing of the embryologic development of the aorta and brachiocephalic vessels (14-mm embryonic stage).
A, Normal development.
B, Development of lusorian artery; origin of right vertebral artery also moves to the left.
C, Development of lusorian artery, origin of right vertebral artery remains on the right (common carotid artery).
D, Development of the right vertebral artery originating from the left and right subclavian artery arising from the right.
