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Epithelial.tissue.pdf - EPITHELIAL { TISSUE Histology = the...

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{EPITHELIALTISSUE
Histology= the study of tissuesTissue = a complex of cellsthat have a common function
The Four Primary Tissue Types:
Epithelium (epithelial tissue)covers bodysurfaces, lines body cavities, and forms glands.Connective tissueunderlies or supports the otherthree basic tissues, both structurally and functionally.Muscle tissueis made up of contractile cells and isresponsible for movement.Nerve tissuereceives, transmits, and integratesinformation from outside and inside the body tocontrol the activities of the body.
General features of Epithelium:1.Can be derivate of all three germ layers2. Cells show polarity3. Little intercellular material4. Cells are laying close to each other5. Tend to form junctions6. Rest on a basementmembrane7. Lack vessels8. Line surfaces and cavities or form glands9. Mitotically active
DerivationEctodermEndodermMesoderm
EctodermEpidermis of skinSweat glands and ducts
Endotheliumlining of blood vesselsMesothelium lining of body cavitiesLining of urinary and genital organsMesoderm
Lining of gastrointestinal tractLining of respiratory tractLiverEndoderm
They have an apicaldomain,a lateral domain,and a basal domain.Epithelial cells exhibit distinctpolarity.Polarity
The apical domain• Part of the epithelial cell that looks towards thelumen or the surfaceCan have:-stereocilia-microvilli-cilia
MicrovilliFingerlike cytoplasmic projections on the apical surfaceInternal structure of microvilli contain a core ofactin filamentsIncrease the surface of absorption (small intestine)
StereociliaUnusually long, immotile microvilliIn sense organs (hair cells) serve as mechanoreceptorsIn male reproductive system (epididymis) have absorptivefunction
Ciliacapable of moving fluid and particles along the epithelialsurface (bronchial tree, oviducts)present in sperm cell as flagella (forward movement)
The basal domainA part of the cell faced towards the basement membrane

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