Epithelium (2008)

Epithelium (2008) - Tissues: Concept and Classification...

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Tissues: Concept and Classification (Chapter 4, pages 92 – 97) A. Cellular Organization: cells, intercellular substances, body fluids B. Embryology: 1. Ectoderm, mesoderm, endoderm C. Four basic tissues 1. Definition of tissue: group of similar cell specialized in a common direction and able to perform a common function 2. Epithelium, connective, muscular, nervous Epithelial Tissue (Chapter 5, pages 98-138) A. Epithelium 1. Characteristics: three-sided; little intercellular material; predominantly cellular; apical (free) surface; basal surface attached to an underlying basement membrane; junctions; no blood (avascular) or lymph within epithelium; many sensory nerve endings; constant cell renewal 2. Functions: covering and lining of surfaces; absorption; secretion; sensation; contraction 3. Origin: Refer to figure 5-37, page 136 a. Ectoderm: epithelium lining the skin, oral cavity, anal canal and vaginal canal b. Mesoderm: lining of blood vessels; lining of genital and urinary tract ducts and tubules c. Endoderm: lining of the respiratory and digestive tract and the gland of the digestive tract 4. Classifications: table 5-1, page 101 a. Cell layer number (1) Simple: one layer of cells
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(2) Stratified: several layers of cells (3) Pseudostratified: all cells rest on a basement membrane but not all cells reach the surface b. Ciliated or non-ciliated c. Cell shape: apical pole, basal pole, lateral surface (1) Squamous (2) Cuboidal
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( 3 ) C o l u m n a r 5. Basal Lamina: 50-100 nm thick; lamina densa; laminae lucidae (studies indicate artifact of staining procedure); composed of type IV collagen, laminin and proteoglycan; anchoring fibrils (collagen type VII) link basal lamina to reticular lamina; referenced as an electron microscopy component at the interface between epithelium and the underlying CT a. Functions of the basal lamina (1) structural attachment (2) compartmentalization (3) filtration (4) tissue scaffolding 6. Basement Membrane: basal lamina + reticular lamina; used in context with light microscopy 7. Simple Epithelium: one layer of cells resting on a basement membrane a. Squamous: thin, plate-like cells; width greater than height (1) Endothelium: epithelial lining of vascular system (2) Mesothelium: lines visceral membranes of body cavities (3) Mesenchymal: embryonic
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b. Cuboidal: central nucleus: box-like shape; width, depth and height all about the same
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This note was uploaded on 04/21/2008 for the course BIOL 101 taught by Professor Kilgen during the Spring '08 term at Nicholls State.

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Epithelium (2008) - Tissues: Concept and Classification...

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