umbrella cell of urothelium
umbrella cell of urothelium
"A urothelial cell that is terminally differentiated and part of the urothelial apical surface that forms the high-resistance barrier of urothelium. Umbrella cells have been described as the largest of urothelial cell types, highly polarized, and, in some species, multinucleated. In the relaxed state, these cells form a dome-shaped structure at the apical pole and can also cover multiple underlying intermediate cells, leading to the name umbrella cells. In contrast, these cells flatten when the bladder is filled."