Final answer:
Rectal diverticula occur in the rectum, which is part of the large intestine. They are a result of diverticulosis, a condition where pouches form in the colon.
Step-by-step explanation:
Diverticula occur in the large intestine, specifically in the walls of the colon. These pouches, called diverticula, can form anywhere in the colon, including the rectum. Diverticula in the rectum are known as rectal diverticula. However, it is important to note that diverticulosis, the condition where pouches form in the colon, is different from diverticulitis, which is the inflammation and infection of those pouches.
The presence of diverticula is influenced by dietary and lifestyle factors, and a diet lacking sufficient fiber can contribute to the formation of these pouches by increasing intestinal pressure.