Which type of ostomy does not allow for any bowel function?

A urostomy is the correct choice because it is created to divert urine away from the bladder when it is not functional or needs to be removed. In a urostomy, the urine is collected in a pouch outside the body, which means that there is no bowel function involved, as the ostomy is specifically concerned with the urinary system rather than the digestive system.

On the other hand, an ileostomy, colostomy, and jejunostomy all involve portions of the bowel and allow for some form of bowel function, as they are formed when parts of the intestines are diverted to an external pouch to manage the output of feces. An ileostomy involves the ileum (the last part of the small intestine), a colostomy is created from a section of the colon (large intestine), and a jejunostomy involves the jejunum (the middle section of the small intestine). Each of these ostomies facilitates the passage of digestive waste, hence they do allow for bowel function, which distinguishes them from a urostomy.