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Epithelial tissue

Epithelial tissue. Epithelial Tissue, Cont. Exposed to environment on one side, bound to BASEMENT MEMBRANE on other. This layer of carbohydrates and proteins that anchors epithelium to underlying connective tissue. How do we name epithelial tissue?. Number of cell layers:

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Epithelial tissue

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  1. Epithelial tissue

  2. Epithelial Tissue, Cont. • Exposed to environment on one side, bound to BASEMENT MEMBRANE on other. • This layer of carbohydrates and proteins that anchors epithelium to underlying connective tissue.

  3. How do we name epithelial tissue? Number of cell layers: • Simple: One layer of cells. • Stratified: More than one layer of cells. • Pseudostratified: Appears to have layers, but only has one layer. Shape of cell: • Cuboidal: Cube-shaped. • Columnar: Column-shaped. • Squamous: Flattened.

  4. Simple Epithelia • Single layer of cells. • Classified according to cell type. Three Types: • Squamous Epithelium Tissue • Cuboidal Epithelium Tissue • Columnar Epithelium Tissue

  5. Simple Epithelium:Squamous Epithelium • Composed of flattened cells. • PROTECTS • Found lining the air sacs of lungs and walls of blood vessels.

  6. What does epithelial tissue look like?

  7. Simple Epithelium:Cuboidal Epithelium • Single layer of cube-shaped cells. • ABSORBS • Found in glands, pancreas, covers ovaries and lines kidney tubules.

  8. What does epithelial tissue look like?

  9. Simple Epithelium: Columnar Epithelium • Rectangular pillars or columns; nuclei near bottom of cell. • ABSORBS • Found lining digestive tract, oviducts.

  10. What does epithelial tissue look like?

  11. Pseudostratified Columnar Epithelium • Appears to be layered but isn’t; Each cell touches basement membrane. • Found in the lining of the trachea.

  12. What does epithelial tissue look like?

  13. Stratified Epithelia • Layers of cells piled one on top of the other. • Only bottom layer touches basement membrane. • PROTECTS • Found in the nose, mouth, esophagus, anal canal, outer cervix and vagina.

  14. What does epithelial tissue look like?

  15. Glandular Epithelia • Epithelium that secretes. • GLAND: Can be a single epithelial cell or can contain many cells. • Exocrine glands: Secrete product onto outer surfaces or into a cavity through ducts. • Sweat glands; mammary glands. • Endocrine glands: No duct; secrete hormones internally. • Pituitary gland; thyroid.

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