Histology

Histology - Histology Assigned Readings: Chapter 4 all of...

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Histology Assigned Readings: Chapter 4 – all of it (pp. 108-135) Lecture Outline I. Introduction to Tissue A. What is tissue B. Four primary tissue types: epithelial (covering), connective (support), nervous (control), and muscular (movement). II. Preparing Human Tissue for Microscopy III. Epithelial Tissue A. Features of Epithelia 1. Covering or lining epithelium 2. Glandular epithelium B. Special Characteristics of Epithelium 1. Very little extracellular matrix 2. Specialized contacts: desmosomes and tight junctions 3. Polarity: apical surface (free) and basal surface (attached) 4. Supported by underlying connective tissue 5. Innervated but avascular 6. High regeneration capacity C. Classification of Epithelia – Where are they found? What do they do? 1. Each epithelial tissue is given two names. a. number of layers present: simple (one) or stratified (more than one). b. shape of the cells. 2. Simple epithelia are mostly concerned with absorption, secretion, and filtration. a. Simple squamous epithelium b. Simple cuboidal epithelium c. Simple columnar epithelium d. Pseudostratified columnar epithelium – in respiratory tract 3. Stratified epithelia’s main function is protection. a. Stratified squamous epithelium – most common stratified type of epithelium, makes up our epidermis, very active type of tissue, lines mouth and skin, bottom of the layer are very regenerative and active, good for resisting abrasion (protection) b. Stratified cuboidal epithelium (rare) - don’t worry about c. Stratified columnar epithelium (rare) - don’t worry about
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d. Transitional epithelium – transitional epithelium changes shape, found in places where stretching needs to take place – found almost exclusively in urinary system (bladder) only 2 or 3 layers thick, but when bunched up there looks to be many more layers than when stretched D. Glandular Epithelia – type of epithelium that is not as structured, but has an important role in secretion ex – hormones, sweat 1. Endocrine glands are ductless glands that secrete hormones into the blood or lymph –
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This note was uploaded on 03/24/2009 for the course BIOL 252 taught by Professor Johnson during the Spring '07 term at UNC.

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Histology - Histology Assigned Readings: Chapter 4 all of...

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