Histology - 3 Histology and Skin Learning Objectives List...

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3. Histology and Skin Learning Objectives List the four major tissue types Describe the general characteristics (structure and function) of epithelial tissue and connective tissue Differentiate among the classes of epithelial and connective tissue Describe the structure and function of skin Histology = Study of Tissues Tissues : Collections of cells and cell products that perform specific functions 4 tissue types form all the structures of the human body: epithelial connective muscle nervous Epithelial Tissue Covers exposed surfaces Lines internal passageways Forms glands Characteristics of Epithelial Tissue Cellularity (cell junctions) Polarity (apical and basal surfaces) Attachment (basal lamina/basement membrane) Avascularity Innervation Regenerative Functions of Epithelial Tissue Provide physical protection Barrier Exchange Secretion Absorption Think about structure / function relationships… Basement Membrane attaches epithelia to underlying connective tissue Intercellular junctions bind epithelial cells together 1
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Desmosomes – connect cells Hemidesmosomes – attach cells to basement membrane Tight Junctions Gap Junctions Classes of Epithelia Based on shape and layers (Fig. 3.6,.7) Squamous (flat); Cuboidal(cube); Columnar(columns) Simple (one layer) vs. Striated (multiple layers) Simple is more effective for diffusion of gases, secretion, absorption, and filtration. Striated is more effective for protection from chemical or mechanical stress. Connective Tissue
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Histology - 3 Histology and Skin Learning Objectives List...

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