What are the organs involved in the human anatomy during an intestinal obstuction of the descending

Pls enumerate all the parts. My instructor said that everything should be comprehensive.I would appreciate it if somebody could answer this question. thank you.

1. first and foremost the ramining descending colon

2. simoid colon

3. rectum

4. then finaly the anus

these are the sites affected when you have an obstruction in the descended colon. naturally, there will be abdominal distention due to trapped intestinal contents like food and air..