<Tr> <Th> FMA </Th> <Td> 15910 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> 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 . </P> <P> 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 . </P>

Trigone is a portion of the blank bladder