All are true about the trigone on the base of the urinary bladder, except:
Trigone of the urinary bladder is a small triangular area located at the base of the bladder with apex towards the lower side. The mucosa is firmly attached to the underlying musculature giving it a smooth texture.Ref: Human Anatomy, B D Chaurasia, 4th Edition, Volume 2, Chapter 30, Page 347; Clinical Anatomy by Regions, Richard S. Snell, 9th Edition, Chapter 7, Page 272.