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. 2022 Apr 20;8(16):eabl6364. doi: 10.1126/sciadv.abl6364

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Fig. 2. — Image of arterial vasa vasorum of the human ascending thoracic aorta (procured during aortic replacement surgery with approval of the University of Pittsburgh Institutional Review Board (protocol no. STUDY20040179). First-order vasa vasorum are oriented longitudinally along the ascending aorta (arrowheads). Second-order vasa vasorum branch from first-order vessels and extend circumferentially around the vessel (white arrows). The proximal end of the vessel is at the bottom. Image was captured using a Nikon SMZ25 Stereoscope with a SHR Plan Apo 1× objective. Images were captured using NIS Elements software (version 4.60.00 and 3× digital zoom). Scale bar, 500 μm.