ureteral orifice
The slit-like opening of either ureter into the bladder; normally, the two ureteral orifices are placed at the posterolateral angles of the urinary bladder trigone while the internal urethral orifice is placed at its anteroinferior angle (apex); wide gaping usually indicates vesicoureteral reflux. Every claim on this page comes from the Leumas anatomy graph and carries its source.
What the ureteral orifice is
The slit-like opening of either ureter into the bladder; normally, the two ureteral orifices are placed at the posterolateral angles of the urinary bladder trigone while the internal urethral orifice is placed at its anteroinferior angle (apex); wide gaping usually indicates vesicoureteral reflux. The atlas records it as a organ at the organ scale in the human body.
Where the ureteral orifice is
It sits in the trunk, within the urinary system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.
What the ureteral orifice connects to
The atlas records 5 typed relationships for it, across 3 kinds of connection. part of fundus of urinary bladder, lower urinary tract and ureterovesical junction.
Supply and innervation
This dataset asserts no arterial supply, venous drainage or innervation for the ureteral orifice. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.
Also called
Also recorded as Mercier's bar, orifice of ureter, orificium ureteris, ostium ureteris, ureteral meatus and ureteral opening, and 3 more. Searching any of those names reaches this page.
Source
Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0012303, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.
- Part of: fundus of urinary bladder, lower urinary tract and ureterovesical junction.
- A kind of: orifice.
- contributes to morphology of: ureterovesical junction.
Questions
Where is the ureteral orifice?
It sits in the trunk, within the urinary system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.
What does the ureteral orifice connect to?
Part of: fundus of urinary bladder, lower urinary tract and ureterovesical junction.
Is the ureteral orifice the same in other species?
Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.