Trigone of urinary bladder

The trigone (a.k.a. vesical trigone)[1] is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice.

Trigone of urinary bladder
Urinary bladder
The interior of bladder.
Details
Identifiers
Latintrigonum vesicae urinariae
TAA08.3.01.024
FMA15910
Anatomical terminology

The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need to empty. The signals become stronger as the bladder continues to fill.

Embryologically, the trigone of the bladder is derived from the caudal end of mesonephric ducts, which is of mesodermal origin (the rest of the bladder is endodermal). In the female the mesonephric ducts regress, causing the trigone to be less prominent, but still present.

Pathology

Clinically important because infections (trigonitis) tend to persist in this region.

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gollark: That would wipe all deleted items and quite possibly break the bot's database migration logic.
gollark: You could do something like `DELETE FROM deleted_items WHERE id = [whatever]`, though obviously that would require finding the ID..
gollark: It uses SQLite3.
gollark: The only way to undelete things would be to remove the row storing their deletion record from the AutoBotRobot database, and only I and [REDACTED] have that access.

See also

References
  1. Woodburne, Russell T. (1965-03-01). "The Ureter, ureterovesical junction, and vesical trigone" (PDF). The Anatomical Record. 151 (3): 243–249. doi:10.1002/ar.1091510305. ISSN 1097-0185.
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