trigone of urinary bladder

The smooth triangular region of the wall of the urinary bladder formed by the two ureteral orifices and the internal urethral orifice; it is an area in which the muscle fibers are closely adherent to the mucosa. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the trigone of urinary bladder is

The smooth triangular region of the wall of the urinary bladder formed by the two ureteral orifices and the internal urethral orifice; it is an area in which the muscle fibers are closely adherent to the mucosa. The atlas records it as a organ at the organ scale in the human body.

Where the trigone of urinary bladder 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 trigone of urinary bladder connects to

The atlas records 6 typed relationships for it, across 4 kinds of connection. part of fundus of urinary bladder.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the trigone of urinary bladder. 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 Lieutaud's trigone, bladder trigone, deep trigone, musculus trigoni vesicae profundus, trigone of bladder and trigonum vesicae, and 4 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001257, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: fundus of urinary bladder.
• A kind of: organ part.
• contains: mucosa of trigone of urinary bladder, submucosa of trigone of urinary bladder and urinary bladder trigone smooth muscle.
• contributes to morphology of: urinary bladder.

Questions

Where is the trigone of urinary bladder?

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 trigone of urinary bladder connect to?

Part of: fundus of urinary bladder.

Is the trigone of urinary bladder 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.