Figure 28. Normal and Bovine Aortic Arch Configurations.
(A) Type I aortic arch: The normal aortic arch configuration. (B) Type II-A aortic arch: The left common carotid artery originates from the innominate artery. (C) Type II-B aortic arch: The innominate and left common carotid arteries share a common origin. LCA indicates left common carotid artery; LSA, left subclavian artery; LVA, left vertebral artery; RCA, right common carotid artery; RSA, right subclavian artery; and RVA, right vertebral artery. Adapted from Layton et al.5 Copyright 2006, American Society of Neuroradiology. Used with permission from Mayo Foundation for Medical Education and Research, all rights reserved.