1 / 24

Understanding Epithelial Tissues in Histology

Explore the characteristics and functions of epithelial tissues, including cell shapes, layers, and gland classification. Learn how these tissues form coverings, linings, and glands in the body. Study histology concepts with detailed explanations.

ocaldwell
Download Presentation

Understanding Epithelial Tissues in Histology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Epithelial Tissue (pg 2)

  2. Tissue = collection of cells that have similar structure and function together as a unit

  3. Tissue = collection of cells that have similar structure and function together as a unit Histology = Study of tissues

  4. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands

  5. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed

  6. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Cells are tightly packed • One free surface

  7. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels)

  8. Epithelial Tissues • Form the covering of all body surfaces, line body cavities and organs, and form glands • Tightly packed • One free surface • Avascular (no blood vessels) • Regenerate quickly

  9. Shapes 1. Squamous = flat cells, thin nuclei

  10. Shapes • Squamous = flat cells, thin nuclei • Cuboidal = cubelike cells, spherical central nuclei

  11. Shapes • Squamous = flat cells, thin nuclei • Cuboidal = cubelike cells, spherical central nuclei • Columnar = Tall narrow cells, nuclei near bottom

  12. Number of Layers • Simple = 1 layer

  13. Number of Layers • Simple = 1 layer • Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue

  14. Number of Layers • Simple = 1 layer • Stratified = Multiple layers of cells. Named according to the type of cells at the free surface of the tissue • Pseudostratified = appears to be multiple layers, but is really only 1 layer

  15. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct

  16. Glandular Epithelium • Exocrine glands = secrete products onto a surface via a duct • Can be unicellular (goblet cells) or multicellular

  17. Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches

  18. Exocrine Glands Classified according to STRUCTURE 1. Simple: duct has no branches 2. Compound: duct has branches 3. Tubular: gland has the same diameter as the duct 4. Acinar (Alveolar): gland is saclike

  19. Exocrine Glands Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands

  20. Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands

  21. Exocrine Glands • Classified according to SECRETIONS 1. Merocrine: fluid released by exocytosis Example: salivary and pancreatic glands 2. Apocrine: small portion of cell is pinched off Example: Mammary glands 3. Holocrine: Cells fill with product and rupture Example: Sebaceous (oil) glands

  22. 1st Period: 8:40-9:40 2nd Period: 9:45-10:45 3rd Period: 10:50-11:50 LUNCH: 11:50-12:24 4th Period: 12:30-1:30 ASSEMBLY: 1:35-2:25 5th Period: 2:30-3:30

More Related