大连医科大学：《组织胚胎学》课程教学课件（英文讲稿）02.Epithelial tissue

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Epithelial Tissue Epithelial Tissue Epithelial Tissue

ContentsCommon features and ClassificationCoverningepitheliumMyoepitheliumand SensoryepitheliumGlandular epithelia andGlandsSpecial structure of epithelium

 Coverning epithelium Coverning epithelium  Myoepithelium and Sensory epithelium  Common features and Classification Special structure of epithelium  Glandular epithelia and Glands Contents

Commonfeatures and Classification* more cells, less intercellular substance* polarity*nobloodvessels.* rich in nerve ending* renewalways* function: protection; absorption; secretion;sensation; and contractility

* more cells, less intercellular substance * polarity * no blood vessels, * rich in nerve ending * renew always * function: protection; absorption; secretion; sensation; and contractility  Common features and Classification

Classification and functionClassificationDistributionCovering Epi.Surface of body, luminal organsGlandsGlandularEpiMyoepitheliumBasal portion of the glandsSensory organsneuroepitheliumGerminal Epi.Sexual organs

Classification Distribution Covering Epi. Surface of body, luminal organs Glandular Epi. Glands Myoepithelium Basal portion of the glands neuroepithelium Sensory organs Germinal Epi. Sexual organs Classification and function

CoverningepitheliumPrinciplesofclassification:the number of cell layersmorphology of the cells in the surface layerTypes of EpitheliumTransitionalSimple squamousSimple cuboidalSimple columnarStratified cuboidalStratified squamousPseudostratifiedcolumnar

Principles of classification: the number of cell layers morphology of the cells in the surface layer  Coverning epithelium Coverning epithelium

1.simplesquamousepitheliumtop view:polyhedralside view: flatBM

1. simple squamous epithelium top view: polyhedral side view: flat

DistributionMesothelium: lining the body cavities(pleural/pericardial/peritoneal)Endothelium: liningthe inner surface of thecardiovascular&lymphaticsystemOthers: alveolar; Bowman's capsule; some renal tubules

Mesothelium: lining the body cavities (pleural / pericardial / peritoneal) Endothelium: lining the inner surface of the cardiovascular & lymphatic system Others: alveolar; Bowman’s capsule; some renal tubules Distribution

2.Simple cuboidal epitheliumTop view: hexagonal; side view: SquareCell boundaries: distinctNu.: round, in the centerDistribution: ovary, thyroid, renal tubulesQOOO

2. Simple cuboidal epithelium Top view: hexagonal; side view: Square Cell boundaries: distinct Nu.: round, in the center Distribution: ovary, thyroid, renal tubules

3.SimplecolumnarepitheliumTop view:polygonal;side:column-likeNu.:elongated, near the baseDistribution: intestine; gall bladder; uterus00

3. Simple columnar epithelium Top view: polygonal; side: column-like Nu.: elongated, near the base Distribution: intestine; gall bladder; uterus

4.Ciliated pseudostratified columnar epitheliumTracheaH&EpseudostratifiedDifferent types of cellscolumnar epitheliumciliagoblet cellAllcellsrestontheBMNot all reach to apical surfaceLocation:respiratorypassagebasementmembranecapillaryciliated columnar c.fusiformcellgoblet cellbasal cell

4. Ciliated pseudostratified columnar epithelium Different types of cells All cells rest on the BM Not all reach to apical surface Location: respiratory passage ciliated columnar c. fusiform cell goblet cell basal cell