Crossword Genius

The brachiocephalic trunk branches from it (5)

Ross

I believe the answer is:

aorta

(Other definitions for aorta that I've seen before include "Body's main artery" , "blood flows from it" , "Vital blood vessel" , "Main artery from heart" , "This carries blood from the heart" .)

I've seen this clue in The New York Times.
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