Various Types of Stratified Epithelial Tissues
Explore the world of stratified epithelial tissues including stratified squamous, cuboidal, and columnar epithelium. Learn about their different types, structures, and locations in the body. Discover the unique characteristics of keratinized and non-keratinized stratified squamous epithelium, as well as stratified cuboidal and columnar epithelium. Delve into the functions and distinguishing features of each type, from the epidermis of the skin to secretory ducts in glands.
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Presentation Transcript
Stratified Epithelial Tissue Preparation assistant lec Fatima Kareem
2. Compound Epithelial Tissue It s consists of many layers, relatively thick Cells nearer the surface are flat whereas the deeper are cuboidal and columnar On the basis of stretching ability, it is of two types ***Stratified epithelium (non-stretchable) ***Transitional epithelium (stretchable)
***Stratified epithelium a. stratified squamous epithelium 1-Keratinized stratified squamous epithelium Cells become non nucleated dead cells Epidermis of skin, horn, nail, feathers etc
2-Non keratinized stratified squamous epithelium Keratin protein is absent Cells are nucleated and living inner lining of cheeks, lips, oropharynx, oesophagus
b. Stratified cuboidal epithelium Secretory duct of sweat glands, mammary glands and sebaceous gland, pancreas, salivary glands
c. Stratified columnar epithelium (1) Ciliated stratified columnar epithelium. Larynx (2) Non ciliated stratified columnar epithelium. Cilia absent on free end. E.g., Epiglottis
( (1 1) ) Ciliated stratified columnar epithelium Ciliated stratified columnar epithelium
2 2- -Non Non ciliated stratified columnar epithelium ciliated stratified columnar epithelium
*** ***Transitional Transitional epithelium epithelium Found in ureter, urinary bladder, proximal part of male urethra Function the transitional epithelium cells stretch readily in order to accommodate fluctuation of volume of the liquid in an organ
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