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