Chapter 4 and 6_SP_09

Chapter 4 and 6_SP_09 - 1/22/2009 Classification of Tissues...

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1/22/2009 1 Classification of Tissues • Tissue = groups of cells with similar structure specialized to perform specific functions • Classified based on their structure & function : 1. Epithelial 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 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 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 Image Source: 2006 Pearson Education, Inc.;
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1/22/2009 2 Simple Cuboidal Epithelium Common in 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) Image Source: 2006 Pearson Education, Inc.; 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 Image Source: 2006 Pearson Education, Inc.; Stratified Squamous Epithelium Designed to protect the underlying layers, where friction is common Lines the mouth, throat, vagina, Image Source: 2006 Pearson Education, Inc. Stratified Cuboidal & Columnar Epithelium Found mainly in the ducts of large glands Stratified cuboidal epithelium lines the lumen of: – mammary glands – the pancreas Stratified columnar epithelium lines parts of the male Stratified Transitional Epithelium Wrinkled designed to allow for distensibility Where do you think one would find it? Glandular Epithelium
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Chapter 4 and 6_SP_09 - 1/22/2009 Classification of Tissues...

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