Transitional epithelium: A transitional epithelium (also known as urothelium) is made up of several layers of cells that become flattened when stretched. It lines most of your urinary tract and allows your bladder to expand.
Where is transitional epithelium is found?
Transitional epithelia are found in tissues such as the urinary bladder where there is a change in the shape of the cell due to stretching.
What are the features of transitional epithelium?
Transitional epithelium is an epithelial tissue which in a relaxed state appears as a stratified cuboidal epithelium. The cells in the transitional epithelium are pear-shaped or round, but as tissue is stretched, cells become flattened, giving the appearance of stratified squamous epithelium.
Why is it called transitional epithelium?
Transitional epithelium is a layer of cells that forms the mucosal lining of your ureters, a portion of your urethra, and your urinary bladder. These cells are called transitional because they can undergo a change in their shape and structure.
What is the importance of the transitional epithelium in the urinary bladder?
Unlike the mucosa of other hollow organs, the urinary bladder is lined with transitional epithelial tissue that is able to stretch significantly to accommodate large volumes of urine. The transitional epithelium also provides protection to the underlying tissues from acidic or alkaline urine.
What is the function of transitional epithelium in the urinary bladder?
Function of Transitional Epithelium
Due to its location in the excretory system, especially in the ureters and urinary bladder, one of the primary functions of this tissue is to be an extremely effective permeability barrier, impenetrable to water and most small molecules.
Is skin epithelial tissue?
The skin has two principal layers. The epidermis is the epithelial tissue layer of skin. Hair follicles, sebaceous glands, and sweat glands are epithelial invaginations from the epidermis.
Which epithelium is present in urinary bladder?
Lining epithelium: The urinary bladder lining is a specialized stratified epithelium, the urothelium. The urothelium is exclusively in urinary structures such as the ureter, urinary bladder, and proximal urethra.
What type of epithelium is transitional epithelium?
The bladder is lined by epithelial cells that are somewhere in between the thick layers of squamous cells and the single layer of tall cells of glandular epithelia. Logically, these cells are called transitional cells because they represent a transition between these two disparate epithelial cell types.
Why transitional epithelium is also called urothelial layer?
The transitional epithelium is also called urothelium because it lines urinary ducts, such as renal calyxes (2 cell layers), urethers (3 to 5 cell layers), urethra (4 to 5 cell layers) and urinary bladder (up to 6 cell layers).
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