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Histology

Histology. From Science Daily: .

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Histology

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  1. Histology

  2. From Science Daily: • Taking small tissue samples from patients with lung cancer and examining them under a microscope (a procedure that falls into the field ofhistology) is now being utilized to better tailor the chemotherapy treatments to improve survival in some patients with non-small cell lung cancer, according to a study presented at the 2008 Chicago Multidisciplinary Symposium in Thoracic Oncology, cosponsored by ASTRO, ASCO, IASLC and the University of Chicago.

  3. What is histology? • The study of the microscopic structure of tissue

  4. What is a tissue?

  5. 4 types of tissues found in the human body • Epithelial tissue • Muscle tissue • Nervous tissue • Connective tissue

  6. What does epi- mean?

  7. What do we notice about this tissue sample?

  8. Characteristics of Epithelial tissue • Always has a free surface • Uninterrupted layer of cells • Minimal intracellular space • Always attached to a basement membrane • Does NOT contain blood vessels (avascular) • Many types have have cilia or micro- villi on surface

  9. Functions of Epithelial Tissue • Provides physical protection • Maintains Homeostasis • Sensory organ • Touch receptors • Temperature receptors • Pain receptors • Pressure receptors • Produces specialized secretions

  10. How is the epithelial tissue renewed and repaired?

  11. Epithelial tissue is classified by number of layers and by shape of the exposed cells

  12. Cell layers • Simple-one layer of cells over basement

  13. Cell layers • Stratified-several layer of cells over basement

  14. Cell shape • Squamous-flat, scale-like cells

  15. Cell Shape • Cuboidal- square-like cells

  16. Cell Shape • Columnar- long, rod-like cells

  17. To describe the tissue: the word describing cell layer comes before word describing cell shapeExample: simple squamous

  18. How would we describe this sample?

  19. Simple Squamous

  20. What is this?

  21. Stratified Squamous

  22. What is this?

  23. Simple Cubodial

  24. Pseudostratified • Single layer of cells, but placement of nuclei in cells makes it appear to be multiple layers

  25. Transitional Epithelium • Consists of multiple layers of cells that can contract and expand

  26. Glandular Epithelial Tissue • Produces secretions Goblet Cells-produce mucin which combines with water to from mucus

  27. Where is each type of tissue found?

  28. All the epi- words • Epithlium=layer of cells • Epidermis=skin • Endodermis=layer of organs

  29. What is surrounding this cell?

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