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Unformatted text preview: 9/2/2008 1 Classification of Tissues Tissue = groups of cells with similar structure specialized to perform specific functions Classified based on their structure & function : 1.Epithelial : covers surfaces, lines cavities & forms glands 2.Connective : supports & framework of all body parts 3.Muscle : movement 4.Nervous : nerve impulses Characteristics of Epithelial Tissue (Epithelium) Specialized to form the covering or lining of all internal & external body surfaces endothelium = epithelium of internal body surfaces Avascular Regenerates easily Ability to modify itself if injured (e.g. calluses) Different types of secretions with specific functions, e.g. mucus in the respiratory tract digestive juices in the gastrointestinal tract...etc. Anatomy of Epithelial Tissue Cells packed tightly together Tissue layer has an apical surface & basal surface (basement membrane of connective tissue) provides structural support for the epithelium and binds it to neighboring structures Classified according to the # & arrangement of cell layers, and their shape Classification of Epithelial Tissue By # of layers & their arrangement Simple : one layer Stratified : many layers Pseudostratified : appear layered, but are not By Shape: Squamous: flat irregular Cuboidal Columnar Simple Squamous Epithelium Thinnest tissue of the body Covers organs & lines blood vessels, lymph vessels, body cavities, & the lungs Simple Cuboidal & Columnar Epithelium Simple Cuboidal Epithelium Common in glands & their ducts Forms walls of kidney tubules Covers the ovaries Simple Columnar Epithelium Lines the digestive tract Cells secrete digestive fluids & absorb nutrients (have microvilli) Includes goblet cells (mucus producing) Pseudostratified Columnar Epithelium Major tissue in respiratory & reproductive tracts May be ciliated or non-ciliated Functions: Secretion & movement of mucus in the lungs (with the aid of cilia) Cilia aid in moving the ovum from the ovaries oviducts uterus 1 2 3 4 5 6 7 1 2 9/2/2008 2 Stratified Squamous Epithelium Designed to protect the underlying layers, where friction is common Lines the mouth, throat, vagina, anal canal, & the outer layer of skin Stratified Cuboidal & Columnar Epithelium Found mainly in the ducts of large glands Stratified cuboidal epithelium lines the lumen of: mammary glands sweat & salivary glands the pancreas Stratified columnar epithelium lines parts of the male urethra & the pharynx Stratified Transitional Epithelium Wrinkled designed to allow for distensibility Where would you find it?...
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- Fall '08