This is the triangular basement muscle of the urinary bladder. It differs in structure and nerves form the top of the bladder, the detrusor muscle, which expands as the bladder fills, and contracts during urination under para-sympathetic nerve stimulus. The trigone dose not expand, is under sympathetic nerve stimulus, and supplies the rigidity and sphincter support for the urethra in front and the ureters in back.
A triangular area of the interior of the urinary bladder, between the opening of the ureters and the orifice of the urethra.
A triangular piece of the wall of the bladder, between the openings for the urethra and the two ureters.
Triangle-shaped space; often referring to the base of the urinary bladder between the openings of the ureters and the urethra.
A triangular region or tissue, such as the triangular region of the wall of the bladder that lies between the openings of the two ureters and the urethra.
The triangular base of the urinary bladder between the openings of the two ureters and of the urethra.
A triangular space, especially one at the base of the bladder, between the two openings of the ureters and the urethra.