Epithelial tissue part 1

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Presentation transcript:

Epithelial tissue part 1 Histology Epithelial tissue part 1 05/06/1438 lecturer Farah E. Alrawi

lecturer Farah E. Alrawi 05/06/1438 lecturer Farah E. Alrawi

The main characteristics of basic types of tissue are: Function Extracellular matrix cells Tissue Transmissionof nerve impulses Very small amount Elongated cells with extremely fine processes Nervous Lining of surface or body cavities; glandular secretion Small amount Aggregated polyhedral cells epithelial movements Moderate amount Elongated contractile cells Muscle Support and protection of tissues/organs Abundant amount Several types of fixed and wandering cells connective 05/06/1438 lecturer Farah E. Alrawi

lecturer Farah E. Alrawi Epithelial Tissue Epithelia are cellular sheets that line the cavities of organs and cover the body surface. 05/06/1438 lecturer Farah E. Alrawi

The principal functions of epithelial tissues include the following: Protection Sensation Secretion Absorption Cellular transport Contractility 05/06/1438 lecturer Farah E. Alrawi

Characteristics features of epithelial tissue 05/06/1438 lecturer Farah E. Alrawi

Polarity of epithelia 05/06/1438 lecturer Farah E. Alrawi

Junctional complexes of epithelial cells 05/06/1438 lecturer Farah E. Alrawi

lecturer Farah E. Alrawi 05/06/1438 lecturer Farah E. Alrawi

05/06/1438 lecturer Farah E. Alrawi

Basal laminae and basement membranes All epithelial cells have at their basal surface a sheet like extracellular structure called the basal lamina, separating them from the underlying connective tissue. where are formed from an electron-dense layer composed of: 1. lamina lucidae: which appear to be transparent. 2. lamina densa: a delicate network of fine fibrils. 05/06/1438 lecturer Farah E. Alrawi

Basement membrane 05/06/1438 lecturer Farah E. Alrawi

Functions of basal lamina It is considered as a molecular filter and as a flexible, firm support for the overlying epithelium. Provide a selective barrier between connective tissue and other cells. The presence of the basal lamina around a muscle cell is necessary for the establishment of new neuromuscular junctions. The ability to influence cell polarity. Regulate cell proliferation and differentiation by binding with growth factors. Influence cell metabolism 05/06/1438 lecturer Farah E. Alrawi

05/06/1438 lecturer Farah E. Alrawi

Covering epithelium/Simple epithelia 05/06/1438 lecturer Farah E. Alrawi

Covering epithelium/Simple epi. 05/06/1438 lecturer Farah E. Alrawi

Covering epi.\Stratified epithelium: 05/06/1438 lecturer Farah E. Alrawi

Covering epi.\Stratified epithelium: 05/06/1438 lecturer Farah E. Alrawi

Proliferation and regeneration of epithelia 05/06/1438 lecturer Farah E. Alrawi

Thank you 05/06/1438 lecturer Farah E. Alrawi