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Meredith Decker

on 29 August 2013

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Transcript of Histology

Histology Epithelial Simple Epithelia Simple Squamous Simple Cuboidal Simple Columnar Pseudostratified Columnar Stratified Epithelia Transitional Stratified Cuboidal Nonkeratinized Stratified Squamous Keratinized Stratified Squamous Connective Tissue Areolar Reticular Dense Regular Dense Irregular Adipose Bone Blood Hyaline Cartilage Elastic Cartilage Fibrocartilage Nervous Tissue Muscular Tissue Skeletal Muscle Cardiac Muscle Smooth Muscle Functions: Protection Secretion Excretion Absorption Filtration Sensation Avascular tissue receiving nutrients from underlying connective tissue basement membrane basal surface vs. apical surface single layer of cells thin scaly cells found in: alveoli of lungs, inner lining of heart and blood vessels, membranes of stomach, intestines, other viscera square or round in shape found in most glands (liver, thyroid, mammary, salivary) tall, narrow cells inner lining of stomach, intestines, gallbladder, uterus, and uterine tubes not all cells reach the free surface respiratory tract, nasal cavity to bronchi 2-20+ layers of cells surface covered with a layer of compact, dead cells packed with keratin found in: epidermis, palms, soles lacks surface of dead cells found in: tongue, oral mucosa, esophagus, anal canal, vagina square or round in shape sweat glands, egg producing vesicles of ovaries, sperm producing vesicles of testis rounded surface cells urinary tract, kidney, ureter, bladder, urethra most abundant type of tissue in the body Functions: Binding of organs Support Physical protection Immune protectors Movement Storage Heat production Transport cells are not in direct contact with each other, but are separated by matrix Fibrous Connective Tissue Cells: Fibroblasts, Macrophages, Leukocytes, Plasma Cells, Mast Cells, Adipocytes

Fibers: Collagenous, Reticular, Elastic

Ground substance: empty space in tissues made up of a gelatinous rubbery consistency, which absorbs shock and protects delicate cells Loose Connective loosely organized fibers, abundant blood vessels, empty space underlying all epithelia, nerves, esophagus, fascia between muscles loose network of reticular cells and fibroblasts lymph nodes, spleen, bone marrow Dense Connective closely packed, parallel fibers tendons and ligaments closely packed fibers, random direction dermis, capsules around liver, spleen and kidneys Cartilage relatively stiff connective tissue with a flexible rubbery matrix produced by chondroblasts, which secrete the matrix and surround themselves with it lacunae -> chondrocytes clear, glassy matrix
not usually visible over the ends of bones at moveable joints, areas in the throat weblike mesh external ear parallel collagen fibers similiar to those of a tendon pubic symphysis, intervertebral discs, menisci "fat cells" large, empty looking beneath skin, surrounding organs hard, calcified tissue that composes the skeleton osseous tissue fluid connective tissue that travels through blood vessels RBC's, WBC's, Platelets heart and blood vessels tissue that contracts and exerts a physical force on other tissues long, threadlike, parallel fibers striated, voluntary attached to bones, also in tongue and esophagus limited to the heart striated, involuntary myocytes - intercalated discs non-striated, involuntary walls of viscera, hair follicles, urethra, anus specialized tissue for communication by means of electrical and chemical signals neurons (nerve cells) neurosoma - cell body that houses the nucleus dendrites- recieve signals from other cells axons- sends outgoing signals to other cells found in: brain, spinal cord, nerves, ganglia Tissues for your Dichotomous Key Epithelial:
Muscle (3)
Loose Connective
Dense Connective
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