Trigone of urinary bladder
|Trigone of urinary bladder|
The interior of bladder.
|Latin||trigonum vesicae urinariae|
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.
- 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.
- Anatomy photo:44:04-0203 at the SUNY Downstate Medical Center - "The Male Pelvis: The Urinary Bladder"