2. • an avascular basic tissue made up of aggregates
of cells organized in continuous sheets with very
minimal amount or no intercellular material in
the extracellular space
• covers many of the body's free surface, lines
internal closed cavities and body tubes as well as
secretory portions of glands and ducts
3. • shape of the cell present
• squamous - flat, plate-like cells
• cuboidal - cells with similar height and distance
• columnar - taller than wide
• number of cell layers
• simple - one layer of cells
• stratified - 2 or more layers
classified based on the following:
12. • protection
• reduction of friction
• absorption
• secretion
• excretion
• synthesis of various proteins
• sensory capacity
epithelial tissue posses numerous functions:
13. • nucleus of each cell appears flattened and the
cytoplasm is indistinct
• further divided into
• mesothelium
• endothelium
• flattened cell epithelium
simple squamous epithelium
14. • height, width, depth are the same
• round, centrally placed nucleus
simple cuboidal epithelium
simple columnar epithelium
• height is 2-3 times greater than their width
• nuclei: less oval, basally located and arranged
uniformly at the same level
15.
16. • conves an impression that it is stratified
• pseudo - false ; stratified - many layers
• upon close examination, it demonstrates a layer
of closely packed cells of varying height and
girth
• nuclei are found at different levels
pseudostratified epithelium
17.
18. • two or more layers
• durable and can protect underlying tissue, thus
can be seen in areas where there is considerable
wear and tear
• SUBTYPES
• stratified squamous
• stratified cuboidal
• stratified columnar
stratified/complex epithelium
19. • special type of stratified epithelium
• made up of several layers of cells that become
flattened when stretched
• lines the organs subjected to contraction and
stretching e.g., urinary bladder
transitional epithelium