Please Explain Completely What is the reason the celiac trunk called a \"trunk.\" ? is it related to its length? Solution celiac trunk is the first major branch of abdominal aorta. it is the largest artery in abdominal aorta, with its three branhes it supply oxygen to stomach,spleen,eosophagus,deodenum,panreas. its name trunk is related to its lenght as it is the largest artery in abdominal aorta..