The superior mesenteric artery (SMA) is a major blood vessel that supplies oxygenated blood to the small intestine and part of the large intestine. It branches off from the abdominal aorta just below the diaphragm and provides blood to vital digestive organs, including the jejunum, ileum, and the cecum. The SMA plays a crucial role in digestion by ensuring that these organs receive the necessary nutrients and oxygen to function properly. Any blockage or narrowing of the SMA can lead to serious conditions, such as mesenteric ischemia, which can affect digestion and overall health.