TOPIC 5 Histology presentation 2009 (1)

TOPIC 5 Histology presentation 2009 (1) - Histology - the...

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Histology - the study of tissues Lecture outline Primary tissue types Epithelial Tissue Connective Tissue Nervous Muscular Tissue Glands Membranes
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Epithelial tissue 1. covering: epidermis, GI tract 2. glandular: glands Connective tissue – support Tendons/ligaments, cartilage, bone, blood Muscular tissue – movement 1. skeletal muscles 2. cardiac muscles 3. smooth muscle Nervous tissue – control and regulation Brain, spinal cord, nerves What is a tissue? Primary tissue classes
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Main differences between primary tissue classes Types and functions of cells Excitability and secretion in nervous tissue Contraction in muscular tissue Characteristics of the matrix = extracellular material fibrous proteins (fibers) + ground substance (ECF, interstitial fluid) Amount of space occupied by cells versus matrix Abundant matrix in connective tissue vs. very little matrix in epithelial and muscular tissues
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Simple Epithelium Simple Squamous Simple Cuboidal Simple Columnar Pseudostratified
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Stratified Epithelium Squamous Keratinized Squamous Nonkeratinized Epithelial layer Lacks surface layer of dead cells Covered with compact, dead cells Found in oral cavity, esophagus, vagina and rectum Found ONLY in the skin – epidermis Protection against abrasion and pathogen invasion
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Stratified Epithelium Secretes sweat; ovarian Found in Sweat/mammary gland ducts; ovarian follicles & seminiferous tubules Shape depends on amount of distension Relaxed – many layers Distended – 2-3 layers Found ONLY in the urinary system to allow filling Stratified Cuboidal Transitional
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Stratified Columnar Epithelium Limited distribution in the body Pharynx, male urethra, some glandular ducts, junctions between 2 other types of epithelia duct
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Glandular Epithelium Gland - one /more cells that make and secrete a particular product Product: hormone, enzyme, secretion 1. Exocrine glands – externally secreting Have a duct Connect to body surface Sweat glands, lacrimal glands 2. Endocrine glands – internally secreting Have no ducts Secrete their products (hormones) directly into bloodstream Thyroid gland, pituitary gland
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This note was uploaded on 06/05/2011 for the course KINS 2531 taught by Professor Sturges during the Spring '11 term at Georgia Southern University .

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TOPIC 5 Histology presentation 2009 (1) - Histology - the...

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