I finally found some great illustrations having to do with my lower anterior resection.
They are from [Wayback/Archive] https://www.uvmhealth.org/healthwise/topic/zm6206 (Bowel resection for colorectal cancer)
The most important for me is this one (as I have end-to-side where “end” is on the very tiny bit of rectum left and “side” is on the descending colon):