? Definition
? Types
? Function
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? Identification? Surface modifications of epithelia
? SIMPLE
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? STRATIFIED
One cell layer thick
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Two or more cell layer thickSquamous,
Stratified Squamous,
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Stratified Cuboidal,
Stratified Columnar
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Cuboidal,Pseudostratified
Columnar
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Transitional
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Cell polarity refers to spatial differences in shape,
structure, and function within a cell.
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? Apical domain
? Lateral domain
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? Basal domainApical domain modifications
? Microvilli
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? Stereocilia/ Stereovilli
? Cilia
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Microvilli? Finger-like cytoplasmic projections on the apical surface (1-3 micron).
? Striated border- regular arrangement
? Brush border - irregular arrangement
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Stereocilia/ Stereovilli
? Unusually long, (120 micron)
? immotile microvilli.
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? Epididymis, ductus deferens, Sensory hair cell of inner ear.--- Content provided by FirstRanker.com ---
Cilia? Hairlike extensions of apical plasma membrane
? Contain axoneme-microtubule based internal structure.
1. Motile 9+2
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2. Primary 9+0
3. Nodal : embryonic disc during gastrulation
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Stratified squamous epithelium(Non-keratinised)
? Variable cell layers-thickness
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? The deepest cells - basal cell layer are cuboidalor columnar in shape.
? mitotically active and replace the cells of the
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epithelium
? layers of cells with polyhedral outlines.
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? Flattened surface cells.Stratified squamous epithelium
(Keratinised)
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Stratified cuboidal epithelium? A two-or more layered cuboidal epithelium
? seen in the ducts of the sweat glands, pancreas, salivary glands.
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Stratified columnar epithelium
? excretory ducts of the mammary gland
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? main excretory duct of the large salivary glands.Pseudostratified columnar epithelium
? Non ciliated pseudostratified
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columnar epithelia ? auditory tube,
ductus deferens.
? Ciliated pseudostratified columnar
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epithelia ?lungs , bronchi
? Pseudostratified columnar epithelia
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with stereocilia in epididymis.Transitional epithelium
? Found exclusively in the excretory urinary passages (the renal calyces
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and pelvis, the ureter, the urinary bladder, and part of the urethra).Epithelial metaplasia
? Squamous metaplasia
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Columnar to squamous in bronchus.? Columnar metaplasia
Stratified squamous to columnar in oesophagus
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? May progress to Carcinoma--- Content provided by FirstRanker.com ---
Identify the epithelium.--- Content provided by FirstRanker.com ---