Chapter 4

Chapter 4 - Classification of Tissues Chapter 3: Tissues,...

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Chapter 3: Tissues, Glands and Membranes Classification of Tissues ! Tissues = groups of cells with similar structure, and a characteristic pattern, specialized to perform specific functions ! Classified based on their structure and function : 1. Epithelial 2. Connective : supports and forms the framework of all body parts 3. Muscle : contracts to produce movement 4. Nervous : conducts nerve impulses Epithelial Tissue (Epithelium) ! Covers the whole surface of the body ! Specialized to form the covering or lining ! Endothelium = epithelium of internal body surfaces ! Epithelial tissue is avascular , i.e. no blood supply Epithelial Tissue (Epithelium) ! Regenerates easily (repairs itself quickly if injured) ! (e.g. formation of calluses) ! Produces different types of secretions with specific functions for the various tracts, e.g. ! mucus in the respiratory tract ! digestive juices in the gastrointestinal tract ! sweat in the skin….etc. Epithelial Tissue (Epithelium) ! Cells are packed tightly together ! Tissue layer always has one free surface ( apical surface ) ! Epithelial tissue is usually separated from the underlying tissue by a thin sheet of connective tissue, the basement membrane (basal surface) ! provides structural support for the epithelium and binds it to neighboring structures Classification of Epithelial Tissue ! layers , and their shape ! By the # of ! Simple ! one layer of cells ! Stratified ! many layers ! Pseudostratified ! appear layered, but are not
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Classification of Epithelial Tissue Shape: ! Squamous: ! flat irregular cells ! Cuboidal: ! cubed shaped ! Columnar: ! column-like elongated cells Simple Squamous Epithelium ! Single layer of flat irregular cells ! Thinnest tissue of the body ! Lines blood vessels, lymph vessels , body cavities, and lungs ! Covers organs ! Forms membranes ! Allows transport across membranes Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology Simple Cuboidal Epithelium ! Single layer of cube-like cells ! Common in ! Forms walls of kidney tubules ! Covers the ovaries Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology Simple Columnar Epithelium ! Single layer of tall cells ! Often includes mucus producing cells (goblet cells) ! Lines the digestive tract, cells ! ! absorb nutrients ! Intestinal cells have microvilli ! increase ( ! ) the surface area available for absorption Image Source: 2006 Pearson Education, Inc.; webanatomy.net/histology Pseudostratified Columnar Epithelium ! Single layer, yet appear as multiple layers ! May be ciliated or non-ciliated ! Functions: ! the lungs (with the aid of cilia) ! Cilia aid in moving the ovum from
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This note was uploaded on 09/22/2008 for the course HP 320 taught by Professor Islam during the Spring '08 term at USC.

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Chapter 4 - Classification of Tissues Chapter 3: Tissues,...

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