The descending branch of the left colic artery is one of the blood vessels responsible for supplying blood, oxygen, and other nutrients to the lower part of the abdominal area or trunk. Its main origin is the abdominal aorta that divides into several branches, one of which is the inferior mesenteric artery. Then, at the lower part of the colon, this blood vessel branches again into the left colic artery, sigmoid artery, and superior hemorrhoidal. The left colic artery traverses the psoas major muscle near the bottom part of the abdomen before dividing into two parts: the descending branch and the ascending branch. The descending branch of the left colic artery then travels to the highest sigmoid artery and creates anastomoses with it. Arches are then formed together from these anastomoses. The branches originating from these arches are responsible for supplying oxygen and other nutrients to the descending part of the colon. It is also responsible for the blood supply of the transverse colon, specifically, the left side.