Final answer:
The celiac artery, or celiac trunk, is the major unpaired branch of the abdominal aorta that supplies blood to the liver, stomach, and spleen.
Step-by-step explanation:
The large unpaired branch of the abdominal aorta that supplies the liver, stomach, and spleen is the celiac artery. It is a major branch of the abdominal aorta that divides into several key arteries: the left gastric artery, which supplies blood to the stomach; the splenic artery, which supplies blood to the spleen; and the common hepatic artery, which branches out to form the hepatic artery to the liver, the right gastric artery to the stomach, and the cystic artery to the gall bladder. It is sometimes also referred to as the celiac trunk.