The trigone is a smooth triangular area on the inner floor of the bladder, marked by the two ureteric openings and the internal urethral opening. Unlike the rest of the bladder lining, it stays smooth even when the bladder is empty. It develops from a different embryonic source than the rest of the bladder.
| Location | On the inner surface of the bladder base (fundus), between the ureteric orifices and the internal urethral orifice |
|---|---|
| Parts |
|
| Nerve Supply | Inferior hypogastric plexus; Pelvic splanchnic nerves S2-S4 |
| Blood Supply | Inferior vesical artery (male); Vaginal artery (female) |
| Venous drainage | |
| Lymphatic drainage |
|
Forms a stable, non-stretching funnel guiding urine toward the urethra and helps anchor the ureteric openings.
The trigone is very sensitive, which is why a stone or catheter tip resting there causes intense urgency. It is a common site for bladder infection changes and for trigonitis in women. During cystoscopy, the trigone is the main landmark for finding the ureteric orifices.
Inflammation of the trigone lining, often with metaplastic change, causing urgency, frequency and pelvic discomfort.
Stones, catheters or tumours near the trigone produce strong urgency and frequency.
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