03_Histology

03_Histology - HISTOLOGY Chapter 4 Four Types of Tissue...

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HISTOLOGY Chapter 4
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Four Types of Tissue Connective tissue (connect) Muscle tissue (contract) Epithelial tissue (cover) Nervous tissue (conduct)
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Tissue Types
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Epithelial Tissue Epithelial tissue forms a barrier between two compartments Functions: physical protection selective permeability secretion sensation
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Characteristics Cellularity Minimal amounts of extracellular fluid (ECF) Polarity Defined apical and basal layers Attachment Basal layer bound to basement membrane Avascularity Contains no blood vessels Receive nutrients from underlying connective tissues (CT) Epithelia that are far from CT will die Innervation Contains nerve endings Regeneration Cells replaced at a high rate via mitosis
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Intercellular Junctions 1. Tight Junctions continuous sealed plasma membranes near apical surface 2. Adhering junctions 1. Desmosomes provides resistance at a single stress point 1. Gap Junctions direct passageway for small molecules to travel between cells
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Review Junctions
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How to Name Epithelial Tissue First name: Number of cell layers Simple Stratified Pseudostratified Two-part Name Second name: Shape of cells Squamous Cuboidal Columnar Example: stratified squamous
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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03_Histology - HISTOLOGY Chapter 4 Four Types of Tissue...

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