Sagittal Section of the Ureteric Orifice (Bladder)

Description

Sagittal sectioning through the adult female bladder brings the trigone into profile, with the ureter entering the bladder wall obliquely to form the ureteric orifice on the posteroinferior aspect of the lumen. The intramural (submucosal) ureter courses anteroinferiorly toward the bladder base before opening, while the bladder neck and proximal urethra lie inferior and anterior to the trigonal region. Posteriorly, the vesicouterine pouch and anterior vaginal wall are typically closest, and the ureteric tunnel sits lateral to the midline but is best appreciated in sagittal relation to the bladder outlet. Key landmarks. That oblique ureteric passage matters because it acts as the physiologic antireflux mechanism, compressed during detrusor contraction to limit vesicoureteral reflux. A sagittal view clarifies why edema, iatrogenic narrowing, or a distal ureteric stone at the ureterovesical junction can produce upstream hydroureter and renal colic, and it also explains the endoscopic appearance of the ureteric orifice during cystoscopy. Gynecologic pelvic surgery intersects this anatomy, since the distal ureter runs close to the cervix and lateral vaginal fornix before reaching the bladder, a common site for ureteral injury. Use this illustration in urology and pelvic anatomy teaching to anchor the relationship between the ureteric orifice, trigone, and bladder neck, and in clinical references describing cystoscopic landmarks, ureteral stent placement, and reflux pathophysiology. It also suits patient-facing surgical consent materials for ureteroscopy or ureteroneocystostomy where spatial clarity at the ureterovesical junction helps. Anatomical accuracy verified by SciePro's Medical Advisory Board.