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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
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Four Primary Tissue Types
- Epithelial - lines & covers surfaces
- Connective - protects, supports, & binds
- Muscular - contracts & produces movement
- Nervous – generates & conducts nerve impulses
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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
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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
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Types of Epithelial Tissue
- Simple Squamous Epithelium Tissue(squamous epithelia cell)
- Location: alveoli (air sacs) of lungs,
- Function: diffusion
Simple Cuboidal Epithelium
Ciliated Columnar Epithelium
Glandular Epithelium
Stratified Epithelium
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