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Epithelial Tissue

Epithelial Tissue

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Epithelial Tissue

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  1. Epithelial Tissue

  2. GENERAL LOCATION • Body coverings • Body linings • Glandular tissue

  3. GENERAL FUNCTIONS • Protection • Absorption • Filtration • Secretion

  4. GENERAL CHARACTERISTICS • Cells fit closely together • Tissue layer always has one free surface • The lower surface is bound by a basement membrane • Avascular (no blood supply) • Regenerates easily if well nourished

  5. CLASSIFICATION • Number of Cell Layers -Simple: one cell layer -Stratified: more than one cell layer • Cell Shape -Squamous: flattened -Cuboidal: cube-shaped -Columnar: column like

  6. TYPES OF EPITHELIAL TISSUE • Simple Squamous Structure: single layer of flat cells Function: forms membranes; lines body cavities Found in: capillaries, lining of lungs

  7. SIMPLE SQUAMOUS

  8. Endothelium • Specialized type of squamous cell that permits efficient diffusion of materials. Very fragile but this allows for rapid gas exchange. Found lining the heart, lungs, blood & lymph vessels.

  9. TYPES OF EPITHELIAL TISSUE • Simple Cuboidal Structure: single layer of cube-like cells often arranged around a space (follicle) Function: secrete fluids; absorption Found in: kidney tubules; ovaries

  10. SIMPLE CUBOIDAL

  11. TYPES OF EPITHELIAL TISSUE • Simple Columnar Structure: single layer of tall cells Function: secrete mucus & enzymes; absorption Found in: the digestive tract lining

  12. SIMPLE COLUMNAR

  13. Goblet cells • Spherical cells that produce mucus - a lubricating material for the digestive tract

  14. TYPES OF EPITHELIAL TISSUE • Psuedostratified (Ciliated) Structure: hair-like projections Function: absorption, secretion of mucus, and aids in the movement of particles Found in: upper respiratory tract & reproductive organs

  15. PSUEDOSTRATIFIED (CILIATED)

  16. TYPES OF EPITHELIAL TISSUE • Stratified Structure: many cell layers Function: protection in areas where friction is common Found in: skin, mouth, esophagus

  17. STRATIFIED

  18. TYPES OF EPITHELIAL TISSUE • Transitional Structure: changes shape based on amount of stretch Function: allows for expansion Found in: urinary tract/bladder lining

  19. TRANSITIONAL

  20. SOURCES OF SLIDES http://images.google.com/imgres?imgurl=http://www.stegen.k12.mo.us/tchrpges/sghs/ksulkowski/images/20_Simple_Columnar_Epithelial_Tissue.jpg&imgrefurl=http://www.stegen.k12.mo.us/tchrpges/sghs/ksulkowski/TissueSlides.htm&usg=__6bG6lRXNVq92ooXE_8vwTjeB25o=&h=467&w=700&sz=91&hl=en&start=3&um=1&tbnid=CJfwZ1avYGDPPM:&tbnh=93&tbnw=140&prev=/images%3Fq%3Depithelial%2Btissue%26hl%3Den%26sa%3DN%26um%3D1 http://www.unomaha.edu/hpa/2740epithelium.html#ss

  21. Gland • One or more cells that secrete a particular product

  22. TYPES OF GLANDS Endocrine - ductless; secretions are hormones that enter the blood vessels ex: thyroid, adrenal, pituitary

  23. TYPES OF GLANDS Exocrine - empty through ducts to the epithelial surface ex: sweat, oil, mammary, salivary

  24. End.