THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The inner lining of the urinary bladder is a mucous membrane of transitional epithelium that is continuous with that in the ureters. When the bladder is empty, the mucosa has numerous folds called rugae. The rugae and transitional epithelium allow the bladder to expand as it fills.

Detailed explanation-2: -The rugae of the urinary bladder are formed from folds of the mucosa permits expansion of the bladder. This expansion is necessary in the bladder for proper function, as it needs to accommodate urine. Rugae are also found in the stomach, another organ that needs to expand as it becomes full with food.

Detailed explanation-3: -Structure of the Bladder Wall The smooth muscle (detrusor) of the bladder wall is protected by an external serosa and on the vesical face overlain by a mucosa that itself consists of a tight transitional epithelium (urothelium), basement membrane and sub-urothelium (fig. 1A).

Detailed explanation-4: -The inner lining of the urinary bladder also has folds of tissue called rugae that similarly can stretch to enable the organ to expand and stretch when filled with urine.