Histology

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Author:
yolyselene
ID:
91777
Filename:
Histology
Updated:
2011-06-23 13:58:16
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Histology
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Histology
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  1. Histology
    Study of structure and function of tissue:

    Groups of cells that are structurally and functionally the same

    A combination of living and no-living material
  2. Four Primary Tissue Types
    • Epithelial - lines & covers surfaces
    • Connective - protects, supports, & binds
    • Muscular - contracts & produces movement
    • Nervous – generates & conducts nerve impulses
  3. Epithelial Tissue (E.T.)
    • Lines, covers surfaces both inside & out
    • Consists of many cells, tightly packed together
    • Usually arranged in layers (except glands)
    • Simple (1 layer) or stratified (2 or more layers)
    • Attached to deeper tissue by basement membrane
    • A free surface is found opposite basement membrane
  4. Specific Types of Epithelial Tissues are Characterized by:
    • Number of layers:
    • Simple (1 layer) - secretion, absorption, filtration, diffusion
    • Stratified (>2 layers) – wear & tear protection

    • Cell shape:
    • Squamous – flat from side, like fried egg from top (yolk: nucleous)
    • Cuboidal - as wide as tall as deep, nucleous in center
    • Columnar – tall & thin, nucleous elongated
  5. Types of Epithelial Tissue
    • Simple Squamous Epithelium Tissue(squamous epithelia cell)
    • ID: flattened cells, mosaic shape, pavement
    • Location: alveoli (air sacs) of lungs,
    • Function: diffusion

    Simple Cuboidal Epithelium

    Ciliated Columnar Epithelium

    Glandular Epithelium

    Stratified Epithelium

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