The terminal segment of the ureter that is continuous with the distal ureter, lies where the ureter enters the bladder and extends within the bladder wall. The intramural ureter is aperistaltic, serving as a reflux-preventing mechanism, preventing the backflow of urine from the bladder into the ureters. [ http://www.ncbi.nlm.nih.gov/pubmed/14142154 http://www.ncbi.nlm.nih.gov/pubmed/30422575 ]