basic tissues simple epithelia dr. károly altdorfer
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Basic tissues
Simple epithelia
Dr. Károly Altdorfer
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Basic tissues
Simple epithelia
Dr. Károly Altdorfer
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Organs (stomach, eyeball) Tissues (epithelia, …) Cells
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Stainings:
Red (acidophil, eosinophil)Blue (basophil)
Most common:
Hematoxylin-eosin (H-E)
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Basic tissues
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Types of epithelia
1. Covering epithelia2. Glandular epithelia3. Pigment epithelia4. Sensory epithelia5. (Myoepithelium)
Epithelial tissue is composed of tightly packed cells.
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Functions of epithelial cells:
-protection of the internal environment (mechanical+biological)-resorption, excretion of materials-secretion
Epithelial tissue
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Simple epithelia
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Simple squamous epithelium (endothelium, mesothelium, epithelium)
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Simple squamous epithelium (mesothelium, AgNO3 impr.)
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Simple cuboidal epithelium
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Simple columnar epithelium
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Pseudostratified columnar epithelium (epididymis)
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Apical
Lateral
Basal
cell surfaces
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Apical
Lateral
Basal
cell surfaces
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Apical surface: microvilli (cuticle – brush border - stereocilia)
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Apical
Lateral
Basal
cell surfaces
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Apical surface: microvilli, cilia
- Tight junctions (diffusion barrier)
- (mechanical barrier)
or Macula adherens (strong cell junction)
(cell connections: transport)
Lateral surface:
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Apical surface
Lateral surface:
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Zonula occludens (tight junction)
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Desmosome or Macula adherens
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Apical
Lateral
Basal
cell surfaces
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Basal striation
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Basal membrane = basal lamina + fibroreticular lamina
(Light microscope electrone microscope)
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