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EPITHELIAL TISSUE Epithel: Epi = Upon

Thele = Nipple

Composed of closely aggregatedpolyhedral cell ith !ery little

e"tracell#lar s#$stance% &i'erentiation of ectoderm(

mesoderm and endoderm%

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 THE P)INCIPLE

*UNCTI+NS: Co!ering and lining of s#rfaces

A$sorption

Secretion

Sensation

Contractility

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 THE *+),S +* EPITHELIAL

CELL

Col#mnar

C#$oidal

S-#amo#s

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.ASAL LA,INAE /isi$le ith the electron microscope Consisting of: lamina densa

  lamina rarae/lucidae *o#nd here other cell types come into

contact ith connecti!e tiss#e%

 

 The term 0Basal Membran1 = #sed tospecify a PAS2positi!e layer( !isi$le ithlight microscope

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INTE)CELLULA)

 3UNCTI+NS The functions: 

2 As site of adhesion2 As seals to pre!ent the 4o of

materials thro#gh the intercell#lar space

2 Pro!ide a mechanism for comm#nication

$eteen ad5acent cells

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The classication of intercellular

 junctions:

2 Adhering 5#nctions 6 Zonulae adherentes,

hemidesmosomes, desmosomes/maculaadherentes7%

2 Impermea$le 5#nctions6 Zonulaeoccludens/ tight junctions7

2 Comm#nicating 5#nctions 68ap 5#nctions7

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Intercellular JunctionIntercellular Junction

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SPECIALI9ATI+N +* THE

CELL SU)*ACE

,icro!illi

Stereocilia

Cilia 4agella

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Cilia

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Microvilli

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Stereocilia

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 T;PES +* EPITHELIAAccording to their structure

and

functions:

 Co!ering epithelia 8land#lar epithelia

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C+,,+N T;PES +*

C+/E)IN8 EPITHELIA Simple epitheli#m

2 S-#amo#s

2 C#$oidal2 Col#mnar

Pse#dostratied72 C#$oidal2 Transitional

2 Col#mnar

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Stratified squamous epithelium

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Simple Cuboid Epithelium

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Simple Columnar Epithelium

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Pseudostratified Columnar Ciliated Epithelium

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Stratified squamous epithelium

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Stratified squamous keratinizing 

epithelium

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Stratified cuboidal epithelium

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Transitional epithelium

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 T;PES +* 8LAN&ULA)EPITHELIA

Endocrine

Exocrine

2 Simple gland 6tubular,coiled

tubular,branched tubular,acinar 7

2 Compo#nd gland 6 tubular,acinar, tubuloacinar 7

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Eocrine !land T"pes

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According to the ay in hich

the secretory prod#cts lea!ethe cell( gland can $e classi