Download MBBS Anatomy PPT 13 Histology Of Compound Epithelium Notes

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Compound Epithelium

Learning objectives

? Definition
? Types
? Function
? Identification

? Surface modifications of epithelia

? SIMPLE

? STRATIFIED

One cell layer thick

Two or more cell layer thick

Squamous,

Stratified Squamous,

Stratified Cuboidal,

Stratified Columnar

Cuboidal,

Pseudostratified

Columnar

Transitional






Cell polarity refers to spatial differences in shape,
structure, and function within a cell.

? Apical domain

? Lateral domain

? Basal domain

Apical domain modifications

? Microvilli

? Stereocilia/ Stereovilli

? Cilia

Microvilli

? Finger-like cytoplasmic projections on the apical surface (1-3 micron).
? Striated border- regular arrangement
? Brush border - irregular arrangement

Stereocilia/ Stereovilli

? Unusually long, (120 micron)
? immotile microvilli.
? Epididymis, ductus deferens, Sensory hair cell of inner ear.




Cilia
? Hairlike extensions of apical plasma membrane
? Contain axoneme-microtubule based internal structure.

1. Motile 9+2

2. Primary 9+0

3. Nodal : embryonic disc during gastrulation

Stratified squamous epithelium
(Non-keratinised)

? Variable cell layers-thickness

? The deepest cells - basal cell layer are cuboidal

or columnar in shape.

? mitotically active and replace the cells of the

epithelium

? layers of cells with polyhedral outlines.

? Flattened surface cells.

Stratified squamous epithelium
(Keratinised)

Stratified cuboidal epithelium

? A two-or more layered cuboidal epithelium
? seen in the ducts of the sweat glands, pancreas, salivary glands.




Stratified columnar epithelium
? excretory ducts of the mammary gland
? main excretory duct of the large salivary glands.

Pseudostratified columnar epithelium

? Non ciliated pseudostratified

columnar epithelia ? auditory tube,
ductus deferens.

? Ciliated pseudostratified columnar

epithelia ?lungs , bronchi

? Pseudostratified columnar epithelia

with stereocilia in epididymis.

Transitional epithelium
? Found exclusively in the excretory urinary passages (the renal calyces

and pelvis, the ureter, the urinary bladder, and part of the urethra).

Epithelial metaplasia

? Squamous metaplasia
Columnar to squamous in bronchus.

? Columnar metaplasia
Stratified squamous to columnar in oesophagus

? May progress to Carcinoma




Identify the epithelium.