Final answer:
A jejunostomy is the term for the surgical creation of an opening into the jejunum, the middle portion of the small intestine. This procedure is used in treatments like fecal pouch creation or ileostomy and is associated with the modification of the digestive tract in bariatric surgery like Roux-En-Y.
Step-by-step explanation:
The surgical creation of an opening into the middle portion of the small intestine is typically referred to as a jejunostomy. The small intestine consists of three main regions: the duodenum, the jejunum, and the ileum. A jejunostomy specifically targets the jejunum, which is the section between the duodenum and ileum. This procedure may be necessary for various medical treatments, including when a fecal pouch needs to be created from the small intestine and sutured to the anus. If that is not an option, an ileostomy might be performed instead by bringing the distal ileum through the abdominal wall. Additionally, bariatric surgery is another context where the small intestine is altered; during a procedure such as Roux-En-Y, the jejunum is directly attached to a newly formed stomach pouch, modifying the digestive tract to treat obesity.