part_of starts_at ends_at bladder urothelium of bladder The urothelium of bladder (ubl) (syn: epithelium of bladder) (TS:22-TS:28) is the innermost layer of the bladder lining the bladder lumen, comprised of a stratified epithelium of three epithelial cell layers containing different epithelial cell types. Contains blood vessels and nerve of urothelium of bladder (TS:22-28). Comprised of three cellular layers; superficial, intermediate and basal cell layers. Distinct epithelial cell types reside within the layers of urothelium and are stage dependant. It is possible to annotate urothelium cell layer without knowing the cell type. In the adult bladder, Krt5-expressing basal cells of bladder urothelium make up 90% of the mature urothelium, while intermediate and superficial cells of bladder urothelium each make up about 5%. EMAPA:28601 anatomical_structure epithelium of bladder urothelium TS22 TS28