2 Ureter l Transitional epithelium lies on a collagenous lamina propria. 2 Mucosa has several longitudinal folds , giving the lumen a stellate shape in the cross-section. 4 CT adventitia , rich in vessels and nerves. 3 Urinary bladder l Transitional epithelium, on a wide collagenous lamina propria without glands, constitutes the mucosa . 2 Three smooth muscle tunics interweave in the muscularis , in a pattern to squeeze the bladder empty.
Retention of urine invites infection.
A CT adventitia has blood and lymphatic vessels, nerve fibres and ganglion cells. The part of the bladder facing the pelvic cavity has a serosa. The lumen is stellate in cross-section.