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EPITHELIUM TISSUE
By: Steph , Lindsey, Kerri, Sam, Steffi, and Katie
NAMING SURFACE EPITHELIAL
Count the layersSimple: 1 layerStratified: looks and is several layersPseudostratified / Transitional: Looks like several
layers, but all the cells contact the basement membrane
What cell is on the top layer?Squamous: Flat (scaly)Cuboidal: about as wide as it is tallColumnar: much taller than it is wide
SIMPLE SQUAMOUS EPITHELIUM Single layer of thin squamous cells
resting on a basement membrane Location:
Air sac of lungsForms the walls of capillariesForms serous membranes
Membranes that lines the ventral body cavity and cavity and covers the organs inside it
SIMPLE SQUAMOUS EPITHELIUM
This shows single layers of squamous (flat) cells around the air spaces (alveoli) of the lung.
SIMPLE CUBOIDAL EPITHELIUM Location
Common in glands and their ducts
Forms walls of kidney tubules
Covers surface of ovaries
• A cluster of ducts in the pancreas• Top layer of the cell is as wide as it
is thick
SIMPLE COLUMNAR EPITHELIUM Location
Line entire length of the digestive track from stomach to anus
Located in digestive tract
PSEODOSTRATIFIED COLUMNAR EPITHELIUM Nonciliated type in male’s sperm-
carrying ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract
PSEUDOSTRATIFIED COLUMNAR
1.Cilia2.Mucus of goblet cell3.Pseudostratified epithelium layer 4.(under three) Basement membrane 5.(under four) connective tissue
STRATIFIED SQUAMOUS EPITHELIUM Nonkeratinized type forms the moist
linings of the esophagus and mouth; keratinized variety forms the epidermis of the skin, a dry membrane.
STRATIFIED SQUAMOUS EPITHELIUM
Little black dots nuclei, mid-section stratified squamous epithelium, right below that basement membrane, lastly connective tissue
TRANSITIONAL EPITHELIUM Lines the ureters, bladder, and part of
the urethra
Top pinkish purple is the transitional epithelium, and then the lighter purple is the basement membrane, then connective tissue
PATHOLOGY 1
Impetigo
IMPETIGO a superficial skin infection characterized by
pustules and caused by either Staphylococci or Streptococci.
PUSTULES, STAPHYLOCOCCI AND STREPTOCOCCI
pustule Staphylococci Streptoco
cci
IMPETIGO AND THE EPITHELIAL TISSUE
Stratified Squamous Epithelium
pustule
Cross section of skin
SIMPLE SQUAMOUS EPITHELIUM
SIMPLE CUBOIDAL EPITHELIUM
SIMPLE COLUMNAR EPITHELIUM
PSEUDOSTRATIFIED COLUMNAR EPITHELIUM
STRATIFIED SQUAMOUS EPITHELIUM
TRANSITIONAL EPITHELIUM
Atopic Dermatitis• Inflammatory, chronically
relapsing, non-contagious and itchy skin disorder
• Type of eczema• Also known as "prurigo
Besnier," "neurodermitis," "endogenous eczema," "flexural eczema," "infantile eczema," and "prurigo diathésique
IMMUNE SYSTEM Cause is genetic Aggravated by
contact or intake of allergens
Also influenced by other factors affecting the immune systemEx. stress and
fatigue
EPIDERMAL BARRIER DYSFUNCTION
Idiopathic- no certain cause
Changes in at least 3 groups of genes encoding structural proteins, epidermal proteases and protease inhibitors may lead to a defective epidermal barrier
EPIDERMAL BARRIER DYSFUNCTION can’t keep in moisture can’t keep out irritants disturbs the formation
of natural skin oils reduces sweat secretion skin can become so dry
that it cracks and fissures develop allowing bacteria and
irritants to penetrate the skin
possibly cause infection