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.
Mucosa is loosely associated to the underlying musculature
Mucosa is smooth
It is lined by transitional epithelium
It is derived from the absorbed pa of the mesonephric duct