Epithelium tissue

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