2010 EPITHELIUM AND GLANDS Complete +lab - EPITHELIUM &...

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Roger J. Bick Reading: Gartner & Hiatt, Chapter 2; Klein and McKenzie, pp61-75, 220, 224, 236 Learning Objectives: Identify different types of epithelia; describe cellular and functional characteristics. Describe the methods of classification of glandular epithelia. Describe the differences between exocrine and endocrine glands. Key Words: Simple and stratified squamous, simple and stratified cuboidal, simple and stratified columnar, transitional, pseudostratified, endocrine gland, exocrine gland I. BASIC TYPES OF TISSUE A. Epithelial – Lines inner and outer surfaces of the body; glandular secretion B. Connective – Supports and protects; forms stroma of glands C. Muscular – Responsible for movement D. Nervous – Transmission of nervous impulses II. CHARACTERISTICS OF EPITHELIAL CELLS A. Avascular B. Have specialized junctions (review previous lecture material on the Cell) . C. Demonstrate polarity . 1. Apical modifications 2. Basement membrane D. Exhibit rapid cell turnover E. Functions 1. Protection 2. Secretion of mucus, hormones, & enzymes (via single cell or gland formation) 3. Absorption of material 4. Selective permeability 5. Transportation of particulates and mucus along surfaces 6. Sensory perception TYPES OF EPITHELIAL TISSUE (Gartner & Hiatt p.31)
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III. CLASSIFICATION OF EPITHELIUM A. Based on cell shape and cell arrangement (layers) 1. First name = one layer or more than one layer Simple = one cell layer thick Stratified = more than one cell layer thick 2. Second name = shape of the surface (top) layer of cells Squamous = cell is flat (longer than it is tall) Cuboidal = cell is square (height and width about the same) Columnar = cell is rectangular (taller than it is wide) B. Additional descriptors used based on the presence of cell-surface modifications (cilia, keratin, etc.) IV. COVERING EPITHELIUM A. Simple squamous epithelium – single layer of flat cells 1. Function – exchange of gases, nutrients; barrier; lubrication 2. Location – lining of blood vessels (endothelium), lining of body cavities (mesothelium); lining of respiratory spaces (alveoli) in the lung; Bowman’s capsule in the kidney B. Simple cuboidal epithelium – single layer of cells of equal height and width 1. Function – absorption and secretion; protection 2. Location – small ducts of exocrine glands; surface of ovary; kidney tubules; thyroid follicles C. Simple columnar epithelium – single layer of cells taller than they are wide 1. Function – absorption and secretion; protection; lubrication 2. Location – lining of gastrointestinal system; lining of gallbladder; some large ducts D. Stratified squamous epithelium – multiple layers of flat cells 1. Function – protection; secretion 2. Location – epidermis, lining of oral cavity, esophagus, and vagina Stratified Squamous Epithelium (G&H, p. 35)
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E. Stratified cuboidal epithelium – multiple layers of cuboidal cells
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This note was uploaded on 12/25/2010 for the course NEUROBIOLO MSI taught by Professor Rogerj.bick during the Spring '10 term at University of Texas Health Science Center at San Antonio.

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2010 EPITHELIUM AND GLANDS Complete +lab - EPITHELIUM &...

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