What are the components of the Ureter? 1) Transitional Epithelium (Urothelium) 2) Umbrella Cells 3) Lamina Propria - thick layer of dense irregular connective tissue rich in collagen and elastic fibers 4) Muscularis Externa - irregular arrangement of smooth muscle in two layers -inner longitudinal and outer circular 5) Adventitia - loose connective tissue with blood vessels, nerves and adipose cells