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Epithelial cell


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Epithelial cell

  1. 1. Epithelial cell<br />Present by: M.Nafly<br />(HND in Biomedical scientist)<br />* Nafly Hussain*<br />
  2. 2. Epithelial cell<br />Pseudostratified columnar<br />Stratified squamous<br />Simple squamous<br />Simple cuboidal<br />Stratified columnar<br />Simple columnar<br />* Nafly Hussain*<br />
  3. 3. Epithelial cell<br />Stratified <br />Epithelial cell<br /><ul><li>Stratified Squamous
  4. 4. Stratified Cuboidal
  5. 5. Pseudo Stratified Columnar</li></ul>Simple <br />Epithelial cell<br /><ul><li>Simple Squamous
  6. 6. Simple Cuboidal
  7. 7. Simple Columnar</li></ul>* Nafly Hussain*<br />
  8. 8. Squamous Epithelia<br />Stratified Squamous<br />Epithelia<br />Simple Squamous<br />Epithelia<br />* Nafly Hussain*<br />
  9. 9. Squamous Epithelia:Structure<br /><ul><li> Simple Squamous Epithelia</li></ul>consist of a single layer of flattened cells and it has a nucleus. It’s shape is rather like crazy paving.<br /><ul><li> Stratified Squamous Epithelia </li></ul> has many layers of flattened cells.<br />* Nafly Hussain*<br />
  10. 10. Squamous Epithelia: Function<br />Simple Squamous Epithelia<br />It protects line passageways cavity and cover the pleura, pericardium and peritoneum.<br /><ul><li>Stratified Squamous Epithelia</li></ul>This epithelium protects underlying layer and repair itself rapidly if damaged . <br /> Outer layer of the cell may be keratinized on dry surface such as skin.<br /> <br />* Nafly Hussain*<br />
  11. 11. Squamous Epithelia Located places <br />Simple Squamous Epithelia<br /><ul><li> Lining the heart
  12. 12. Blood vessels
  13. 13. Lung alveoli
  14. 14. Body cavities</li></ul>Stratified Squamous Epithelia<br /><ul><li> Lining the mouth
  15. 15. Cervix and virgina</li></ul>* Nafly Hussain*<br />
  16. 16. Blood vessels<br />* Nafly Hussain*<br />
  17. 17. Lining the mouth<br />* Nafly Hussain*<br />
  18. 18. Simple Squamous Epithelia<br />Apical surface<br />Nucleus<br />Basal surface<br />Stratified Squamous Epithelia<br />Apical surface<br />Nucleus<br />Basal surface<br />* Nafly Hussain*<br />
  19. 19. Squamous Epithelia Adaptation<br />This epithelial cells either impervious or semipermiable depending on the tissue<br />Outer layer of the cell may be keratinized on dry surface such as skin.<br />* Nafly Hussain*<br />
  20. 20. * Nafly Hussain*<br />
  21. 21. Cuboidal Epithelium<br />* Nafly Hussain*<br />
  22. 22. Structure of cuboidal epithelia<br />Characteristics : <br /><ul><li>Roughly square in shape.
  23. 23. Each cell has a spherical nucleus in the centre.
  24. 24. Cells lie on basement membrane.
  25. 25. Tightly packed with little or no-inter cellular substance.</li></ul>* Nafly Hussain*<br />
  26. 26. Structure<br />* Nafly Hussain*<br />
  27. 27. Single layer <br />Arpical surface<br />Cytoplasm<br />Nucleas<br />Basal lamina<br />Connective tissue<br />* Nafly Hussain*<br />
  28. 28. Found in :<br />* Nafly Hussain*<br />
  29. 29. Simple cuboidal : Kidney Tubules<br />* Nafly Hussain*<br />
  30. 30. Stratefied Cuboidal: Sweat gland<br />* Nafly Hussain*<br />
  31. 31. Simple Cuboidal: Function<br /><ul><li>Provide a layer of protection from :</li></ul>abrasion<br />foreign particles<br />invading bacteria<br />excessive water loss to the underlying tissue<br />* Nafly Hussain*<br />
  32. 32. Function and Adaptation<br />* Nafly Hussain*<br />
  33. 33. Kidney tubules<br />* Nafly Hussain*<br />
  34. 34. Function and Adaptation<br />* Nafly Hussain*<br />
  35. 35. Respiratory bronchioles<br />* Nafly Hussain*<br />
  36. 36. Function and adaptation<br />* Nafly Hussain*<br />
  37. 37. Ovarian surface<br />* Nafly Hussain*<br />
  38. 38. Stratefied Cuboidal: Function<br />They protect the sweat glands, salivary glands and mammary glands.<br />They aid in sweat secretion.<br />They help in sperm production.<br />They also aid in secretion of ovarian hormones.<br />* Nafly Hussain*<br />
  39. 39. * Nafly Hussain*<br />
  40. 40. Columnar Epithelia<br />* Nafly Hussain*<br />
  41. 41. Columnar Epithelia<br />Pseudostratified<br />Columnar<br />Simple <br />Columnar<br />* Nafly Hussain*<br />
  42. 42. Structure<br />Pseudostratified Columnar<br />All cells rest on the basement membrane but all cells do not reach the lumen.<br />Thenuclei are found at different levels.<br />Only a single layer of cells. but looks multilayered.<br />Has its cell nuclei positioned in a manner suggestive of stratified. <br />Simple Columnar<br />Uni-layered<br />The height of the cells may vary.<br />Cells are elongated and column shaped.<br />Characteristically their nuclei are also elongated and usually located near the base of cells. and at right angles to the base.<br />The cells are longer than their width.<br />* Nafly Hussain*<br />
  43. 43. Functions<br />Simple Columnar Epithelium<br />The main function is protection.<br />For example, the epithelium in the stomach and digestive tract provides an impermeable barrier against any bacteria that could be ingested but is permeable to any necessary ions .<br />Simple columnar epithelial cells can specialize to secret mucus that coats and protects the surrounding surface from damage.<br />simple columnar epithelium is also specialized to provide sensory input.<br />simple columnar epithelium are very good at absorbing and transporting nutrients from locations like the small intestine .  <br />* Nafly Hussain*<br />
  44. 44. Pseudo stratified Columnar Epithelium.<br /><ul><li>Pseudo stratified ciliated epithelium lines the nasal cavities, trachea, and bronchi. Its function is to protect these structures, secrete mucus by goblet cells, and move mucus by cilia.
  45. 45. Trap and move "pollutants" to the mouth where they are swallowed.
  46. 46. Secretes and propels mucus by ciliary actions.
  47. 47. Has an absorptive function. </li></ul>* Nafly Hussain*<br />
  48. 48. * Nafly Hussain*<br />
  49. 49. Location<br />Simple Columnar<br />Sites where chief function is – protection<br /> Eg. ducts of glands bronchioles<br />Sites where cells can<br /> both secrete and absorb.Small intestine<br />• Sites where the cells are specialized to secrete - surface lining of stomachcervical canal.<br />Uterine tube<br />* Nafly Hussain*<br />
  50. 50. Eyes<br />Ears<br />Buccal cavity<br />Digestive tract<br />Reproductive organs<br />* Nafly Hussain*<br />
  51. 51. Location<br />Pseudo stratified Columnar<br />respiratory tract from nasal cavity to bronchi<br />portions of male urethra.<br />* Nafly Hussain*<br />
  52. 52. Simple Epithelium<br />Apical surface<br />Columnar cell cytoplasm<br />Tight junctions<br />Other junctions, such as adherens or desmosomes<br />Nucleus<br />Basement membrane basal surface<br />Basal surface<br />* Nafly Hussain*<br />
  53. 53. Pseudo stratified Epithelium<br />* Nafly Hussain*<br />
  54. 54. Adaptations<br />Simple columnar.<br />Cilia found on the luminal surface.<br />Goblet cells within columnar cells.<br />Microvilli specialized for absorption.<br />* Nafly Hussain*<br />
  55. 55. Adaptations<br />Pseudostratified columnar.<br /><ul><li>Ciliated in the respiratory system.
  56. 56. Has large microvilli or stereocilia onthe surface,in the male genital system. </li></ul>* Nafly Hussain*<br />