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Histology The Study of the microscopic structures of tissues Histological Grouping of Tissue • 1. Epithelial Tissue • 2. Connective Tissue • 3. Muscle • 4. Nervous Tissue Epithelial Tissue • Tissue that covers a body surface or lines a body cavity. • Is named based on two criteria: 1. Cell shape 2. Cell layers • Functions in: protection, absorption, • filtration, excretion/secretion and as a sensory receptor Cell Layers • 1. Simple: one cell layer • 2. Stratified: two or more cell layers • 3. Pseudostratified: one cell layer but looks as if it has several layer . Cell Shape • 1. Cuboidal : cubed shaped cells • 2. Columnar: column shaped cells • 3. Stratified: flat scale shaped cells Epithelial Slides Covered On ALL SLIDES BE ABLE TO IDENTIFY THE TYPE OF TISSUE AND KNOW: • CELL MEMBRANE, • CYTOPLASM • NUCLEUS • Slides covered • 1. Simple squamous epithelium • 2. Simple cuboidal epithelium • 3. Simple columnar epithelium • 4. Pseudostratified ciliated columnar epithelium Know: cilia, goblet cells • 5. Stratified squamous epithelium Simple Squamous Epithelium • Simple cuboidal epithelium Simple columnar epithelium Pseudostratified ciliated columnar epithelium Stratified squamous epithelium Connective Tissue • The most abundant and widely distributed tissue • Functions in: binding and support, protection, insulation and transportation • Characterized by having few cells scattered about a nonliving matrix. Adipose Tissue • Know • Nucleus • lipids Aereolar Connective Tissue • • Know: • Fiberblast • Collagenous fibers • Elastic fibers Blood Bone Hyaline Cartilage • • • • Know: Lacunae Rubbery matrix chondrocytes Elastic Cartilage • Know • Lacunae • Elastic fibery matrix • chondrocyte Reticular Connective Tissue • Know: • Reticular cells • Reticular fibers Muscles Divided into 3 categories: 1. Smooth 2. Cardiac Skeletal muscle cross section Skeletal muscle longinal section Smooth Muscle Cardiac Muscle Nervous Tissue The functional unit of nervous tissue is the neuron More later Neuron
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