just because its an opportunity to discuss this, the aorta is big and complex
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now in my case my aneurysm went all the way into the arch (yep, that dissection woulda been short and sharp)
Now the arch is complex with some variations in anatomy; the more common variants
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some less common ones ...
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https://neuroangio.org/anatomy-and-variants/aortic-arch/
so depending on the location on the aorta of the surgery, some of or all of those have to be reattached to the graft ...
HTH
PS: just as a final point that descending aorta is what a good Samurai is aiming for when they perform Seppuku. Its a fast death where the person often freezes. The rapid depressurisation of the brain sets it into shock.