Trigone of urinary bladder - wikipedia Trigone of urinary bladder This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( November 2016 ) Trigone of urinary bladder Urinary bladder The interior of bladder. Details Identifiers Latin trigonum vesicae urinariae TA A08. 3.01. 024 FMA 15910 Anatomical terminology ( edit on Wikidata ) 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 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. Contents 1 Pathology 2 See also 3 References 4 External links Pathology Clinically important because infections ( trigonitis ) tend to persist in this region. See also Trigonitis References Jump up ^ Woodburne, Russell T. ( 1965 - 03 - 01 ). `` The Ureter, ureterovesical junction, and vesical trigone ''. The Anatomical Record. 151 ( 3 ) : 243 -- 249. doi : 10.1002 / ar. 1091510305. ISSN 1097 - 0185. External links Anatomy photo : 44 : 04 - 0203 at the SUNY Downstate Medical Center - `` The Male Pelvis : The Urinary Bladder '' Anatomy of the urinary system Kidneys Layers Fascia Capsule Cortex column Medulla sinus pyramids medullary interstitium Lobe Cortical lobule Medullary ray Nephron Circulation Arteries Renal artery segmental interlobar arcuate interlobular afferent Veins Renal vein Peritubular capillaries Vasa recta arcuate interlobar efferent Nephron Renal corpuscle Glomerulus Bowman 's capsule Glomerular basement membrane Podocyte Filtration slits Mesangium Intraglomerular mesangial cell Renal tubule Proximal convoluted tubule Loop of Henle Descending Thin ascending Thick ascending Distal convoluted tubule Collecting duct system Connecting tubule Papillary duct Tubular fluid Renal papilla Minor calyx Major calyx Renal pelvis Juxtaglomerular apparatus Macula densa Juxtaglomerular cells Mesangium Extraglomerular mesangial cell Ureters Ureteropelvic junction Bladder Apex Uvula Neck Median umbilical ligament Muscular layer Trigone Detrusor Mucosa Submucosa Urethra Urethral sphincters External sphincter male female Internal sphincter Portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Trigone_of_urinary_bladder&oldid=825196716 '' Categories : Urinary system Hidden categories : Articles needing additional references from November 2016 All articles needing additional references Talk Contents About Wikipedia Deutsch Français Italiano Português Edit links This page was last edited on 12 February 2018, at 00 : 52 ( UTC ). About Wikipedia

Question: trigone is a portion of the blank bladder
Answer: urinary