COVERING AND LINING EPITHELIUM

COVERING AND LINING EPITHELIUM

• Covering and lining epithelium are classified on the  basis of arrangement of layers,cell shapes and function
• 1.       Simple epithelium :- cell of the tissue are arranged in a single layer
• 2.       Stratified epithelium :- cell are stacked in several layers
• 3.       Pseudostratified epithelium :- cells are arrangement in a single layer , but some of the basal cells do not reach the surface. Pseudostratified epithelium is ciliated and contain many goblet cells
• 4.       Squamous epithelium :- cells are flattened .scale like and attached to each other like a mosaic
• 5.       Cuboidal epithelium :- cell are usually cube-shaped in cross-section,sometimes appear as hexagon
• 6.       Columnar epithelium:- cells are tall and cylindrical , appearing as rectangular set on end
• 7.       Transitional epithelium :- Cells have a combination of shapes,found where there is a great degree of distension or expansion in the body
• 8.       Neurosensory epithelium :- cells are modified colunmnar with sensory hairs at their free ends and are connected with nerve fibres
• 9.       Pigmented epithelium :- Cells containing pigements
• 10.    Germinal epithelium :- Specialized cuboidal cells capable of producing gametes as found in gonads. Germinal epithelium produces gametes e.g = Ova  and sperms