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H4 Epithelial Tissue (Function: (Line Organs, Form Glands), Glandular…
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TYPICAL EPITHELIUM ON BIOPSY
Polarized
Densely packed Epithelial Cells
- INTERcellular junctions w/ little ECM
- Single or multiple layers
- Avascular (no blood or lymph)
Free surface - Apical Domain
can have cilia, microvilli but NO large cellular outgrowths
Cilia = transport material
Microvilli - absorption & secretion
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Basal Domain - Basement Membrane
- passage of material regulated here
- Type III collagen = Silver or PAS stain
Hemidesmosomes resist mechanical separation from BM
Loose CT
- Vascular
- Nutritional support
- Less cellular, more ECM
- Basal Lamina = thin, electron DENSE
- Reticular Lamina = thick, lucent
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