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Download Tissues - Coastal Bend College
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Tissues Histology- the study of tissues 4 tissue types 1. Epithelial Tissue – Covers both internal and external surfaces 2. Muscle Tissue – Highly specialized tissue designed to contract 3. Nervous Tissue – 2 types of cells neurons (carry signal) and neuroglia (care for and support neurons). 4. Connective Tissue – Connects, protects, supports, insulated, energy storage, blood formation, & body tissue repair (Scars) Epithelial Tissue • # of layers – Simple one – Stratified >1 • Cell shape – Cuboidal- Cube shaped – Columnar – column shaped – Sqamous- squished like a pancake. Epithelial Tissue- Simple Squamous Cuboidal Columnar Simple Squamous Cell Membrane Nucleus Simple Cuboidal Cell Membrane Nucleus Basement Membrane Simple Columnar Cell Membrane Basement Membrane Nucleus Epithelial Tissue- Stratified Squamous Cuboidal Columnar Stratified Squamous Cell Membrane Basement Membrane Nucleus Stratified Cuboidal-Not on practical • Found: – Sweat gland ducts – Ovarian follicular cells – Salivary gland ducts • Function: – Secretion – Absorption – Protection against infection Stratified Columnar- Not on practical • Found: – Mammary gland ducts – Larynx – Portions of the male urethra • Function – Protection – secretion Exceptions Pseudostratified Ciliated columnar Transitional Epithelium Collapsed Distended Pseudostratified Ciliated columnar Cell Membrane Basement Membrane Nucleus Cilia Free surface Transitional Epithelium Nucleus Cell Membrane Basement membrane Muscle Tissue Highly specialized tissue designed to contract • 3 types: Skeletal Muscle Cardiac Muscle Smooth Muscle Skeletal Muscle Striations Multiple Nuclei Cardiac Muscle Intercalated Disk Nucleus Smooth Muscle Nucleus Muscle cell Nervous Tissue • Two major cell populations 1. Neurons- specialized cells that receive stimuli and conduct impulses all over the body 2. Neuroglia- special cells that protect, support, and insulate the more delicate neurons Motor Neuron Multipolar neuron/ Motor neuron Glial Cells Dendrite Nucleolus Axon Hillock Axon Cell body Nucleus Connective Tissue • Usually have a rich blood supply • Composed of many cell types • Great deal of non-cellular, nonliving material between cells (Matrix) Jelly Fibers •Interstial fluid, cell adhesion proteins, & proteoglycans •Dependent on combo is can be liquid, semisolid, gel-like or very hard •Collagen fibers: very strong and flexible but not elastic •Elastic fibers- can be stretched but return to their original shape •Reticular fibers- fine collagen fibers, not strong but fill spaces Connective Tissues (CT)all derived from mesenchyme 1. CT proper – – Areolar CT Dense CT A. B. – – Regular Irregular Adipose Reticular 2. Cartilage A. Hyaline Cartilage B. Fibrocartilage C. Elastic cartilage 3. Bone 4. Blood Loose (Areolar) Connective tissue Reticular Fiber Collagen Fiber Nucleus Elastic fiber Loose connective tissue Adipose Tissue Reticular tissue Adipocyte Cell membrane Nucleus Reticular fiber Cell of organ being supported by the fibers Dense connective tissue Nucleus Collagen Fiber Collagen Fiber Nucleus Dense Regular CT Dense Irregular CT CT-Cartilage Hyaline Cartilage fibrocartilage Elastic Cartilage Hyaline Cartilage Chondrocyte Perichondrium Lacuna Fibrocartilage Collagen fibers Chondrocyte Elastic Cartilage Lacuna Elastic Fibers Chondrocyte Bone Lacuna Central canal Osteon Blood Red Blood Cell Plasma White Blood Cell Platelet
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