What is the spinal level of the inferior mesenteric artery (IMA)?

The inferior mesenteric artery (IMA) typically arises from the abdominal aorta at the level of the third lumbar vertebra, or L3. This anatomical landmark is significant as it is where the aorta bifurcates into the common iliac arteries, which supply blood to the lower abdomen and pelvic region. The IMA supplies blood to the distal part of the colon, including the descending colon, sigmoid colon, and the upper part of the rectum. Understanding the spinal levels at which major arteries branch from the aorta is crucial for surgical planning and for understanding the blood supply to the abdominal organs.