noun
ascending aorta
Medical/anatomical term for the first portion of the aorta, rising from the heart.
上行大動脈は心臓から血液を全身に送り出す最初の血管です。
The ascending aorta is the first blood vessel that sends blood from the heart to the whole body.
Compound of 上行 (ascending) + 大動脈 (aorta). The exact historical derivation is uncertain; the term follows standard medical kanji usage.