The trigone (a.k.a. vesical trigone)
is a smooth triangular region of the internal
urinary bladder formed by the two
ureteric orifices and the
internal urethral orifice.
The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the
brain
A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as vision. It is the most complex organ in a ve ...
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
infection
An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. An infectious disease, also known as a transmissible disease or communicable dis ...
s (
trigonitis) tend to persist in this region.
See also
*
Trigonitis
References
External links
* - "The Male Pelvis: The Urinary Bladder"
{{Authority control
Urinary system