That should be the rectum.
large intestine
The small intestine is usually attached to the large intestine and that is attached to the rectum. If the large intestine is so damaged or diseased that it must be completely removed, the surgeon may attach the small intestine to the rectum using sutures that eventually dissolve. The loss of the large intestine is a serious matter and may result in an iliostomy (connecting the end of the small intestine to an abdominal hole, or stoma, to which an external bag is attached) rather than to the rectum.
it would be the large intestine
The naturally occurring opening at the terminal end of the large intestine is the anus.
appendix
Directly after the stomach, food enters the duodenum, which is the first part of the small intestine.
The blind pouch at the beginning of the large intestine is called the cecum, and it has the vermiform appendix attached underneath.
The anus is the opening from the rectum to the outside of the body. The rectum is the final section of the large intestine.
The appendix.
The appendix.
The appendix.
Vermiform or the appendix