The cecum is the beginning of the large intestine and is the shortest of the segments of the large intestine. The cecum is the part that connects the ascending colon to the end of the ileum and has a lip-like flap in the center called the ileocecal valve. The ileocecal valve has a very important role and functions as a sphincter. It not only prevents the contents of the large intestine from flowing back into the small intestine, but also controls the flow of chow from entering the large intestine too quickly to ensure that the chow is able to fully absorb nutrients in the small intestine. In addition, the cecum can also absorb water and temporarily store the body’s excretory products. The cecum contains a lot of bacteria, these bacteria can help the body synthesize vitamin B complex and vitamin K, so the cecum has a great role in the human body.