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In biology and medicine, epithelium is a tissue composed of cells that line the cavities and surfaces of structures throughout the body. Many glands are also formed from epithelial tissue. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.

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Wikipedia about epithelial

Illu%20epithelium.jpg

In biology and medicine, epithelium is a tissue composed of cells that line the cavities and surfaces of structures throughout the body. Many glands are also formed from epithelial tissue. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.

Tissue that line the inside of the mouth, the esophagus, and part of the rectum are composed of nonkeratinized stratified squamous epithelium. Other sufaces that separate body cavities from the outside environment are lined by simple squamous, columnar, or pseudostatified epithelial cells.

Other epithelial cells line the insides of the lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands. The outer surface of the cornea is covered with fast-growing, easily-regenerated epithelial cells.

Functions of epithelial cells include secretion, absorption, protection, transcellular transport, sensation detection, and selective permeability.

Endothelium (the inner lining of blood vessels, the heart, and lymphatic vessels) is a specialized form of epithelium. Another type, mesothelium, forms the walls of the pericardium, pleurae, and peritoneum.

In humans, epithelium is classified as a primary body tissue, the other ones being connective tissue, muscle tissue and nervous tissue. Epithelium is often defined by the expression of the adhesion molecule e-cadherin, as opposed to n-cadherin, which is used by cells of the connective tissue.

Classification

Epithelial cells are classified by the following three factors:

Squamous

All Squamous cells are soft cells with an irregular shape. A one-cell layer of simple squamous epithelium forms the alveoli of the respiratory membrane, and the endothelium of capillaries, and is a minimal barrier to diffusion. Squamous cells can be found included in the filtration tubules of the kidneys, and the major cavities of the body. These cells are relatively inactive metabolically, and are associated with the diffusion of water, electrolytes, and other substances.

Cuboidal

As the name suggests, these cells have a shape similar to a cube, meaning its width is the same size as its height. The nuclei of these cells are usually located in the center. The cuboidal epithelium forms the smallest.

Columnar

These cells are taller than they are wide. Simple columnar epithelium is made up of a single layer of cells that are longer than they are wide. The nucleus is also closer to the base of the cell. The small intestine is a tubular organ lined with this type of tissue. Unicellular glands called goblet cells are scattered throughout the simple columnar epithelial cells and secrete mucus. The free surface of the columnar cell has tiny hairlike projections called microvilli. They increase the surface area for absorption.

Search results for Epithelial

Animal Tissues

Epithelial. Muscle. Connective ... The apical surface of these epithelial cells is exposed to the "external ... entire sheet of epithelial cells is attached to ...users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/AnimalTiss...

Ovarian Epithelial Cancer Treatment - National Cancer Institute

Expert-reviewed information summary about the treatment of ovarian epithelial cancer. ... Ovarian epithelial cancer is a disease in which malignant (cancer) ...www.cancer.gov/cancerinfo/pdq/treatment/ovarianepithelial/pa...

Surface epithelial-stromal tumor - Wikipedia, the free encyclopedia

Surface epithelial-stromal tumors are a class of ovarian neoplasms that may be ... lined by tall, columnar, ciliated epithelial cells. filled with clear serous fluid ...en.wikipedia.org/wiki/Surface_epithelial-stromal_tumor

Ovarian Epithelial Cancer

The following is a list of ovarian epithelial cancer histologic classifications. ... Recurrent or Persistent Ovarian Epithelial Cancer. Get More Information From NCI ...www.webmd.com/ovarian-cancer/tc/ovarian-epithelial-cancer-tr...

What Is Ovarian Epithelial Cancer

Ovarian epithelial cancer is a disease in which malignant (cancer) cells form in ... After ovarian epithelial cancer has been diagnosed, tests are done to find out ...cancer.uchc.edu/patients_families/treatment_types/ovarian/ov...

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News about Epithelial

Advanced Ovarian Cancer Patient Enrollment Phase 2 Study Of IMC-1121B Commences

Medical News TodayImClone Systems Incorporated (NASDAQ: IMCL), a global leader in the development and commercialization of novel antibodies to treat cancer, today announced that the first patient has been treated in its disease-directed Phase 2 clinical trial of IMC-1121B in patients with advanced ovarian cancer.http://www.medicalnewstoday.com/articles/123851.php

ImClone commences enrollment for Phase II ovarian cancer trial

Pharmaceutical Business ReviewImClone Systems has announced that the first patient has been treated in its disease-directed Phase II clinical trial of IMC-1121B in patients with advanced ovarian cancer.http://www.pharmaceutical-business-review.com/article_news.a...

Arriva Pharmaceuticals Granted Protein Production Patent

Centre Daily TimesArriva Pharmaceuticals, a biopharmaceutical company focused on developing anti-inflammatory therapies, announced today that it had been granted a patent in the U.S. for methods to produce certain proteins in yeast. Among the proteins whose production is covered by the patent (United States Patent 7,419,801) is recombinant alpha 1-antitrypsin (rAAT), the protein used in Respriva(TM), the ...http://www.centredaily.com/business/technology/story/876372....

Arriva Pharmaceuticals Granted Protein Production Patent

Business Wire via Yahoo! Finance ALAMEDA, Calif.----Arriva Pharmaceuticals, a biopharmaceutical company focused on developing anti-inflammatory therapies, announced today that it had been granted a patent in the U.S. for methods to produce certain proteins in yeast.http://biz.yahoo.com/bw/081001/20081001005220.html?.v=1

Trefoil factor 3 (tff3) as a target for anti-cancer therapy

FreshPatents.comThe present invention is directed to methods of treating and preventing cancer, such as cancer characterized by differential expression of trefoil factor 3 (TFF3). The methods include administering to a patienthttp://www.freshpatents.com/Trefoil-factor-3--tff3--as-a-tar...

News about Epithelial

Leber's Congenital Amaurosis

WOODThis also is called amaurosis congenital of Leber's, congenital retinal blindness, hereditary epithelial aplasia, and retinal aplasia. Description One kind of Leber's amaurosis results in complete blindness, but with a second kind the pathology does ... http://www.woodtv.com/global/story.asp?s=1230681

Basal Cell Carcinoma

HealthScoutBasal cell carcinoma is a type of skin cancer . It is a malignant epithelial cell tumor that begins as a papule (a small, circumscribed, solid elevation of the skin) and enlarges peripherally, developing into a crater that erodes, crusts and bleeds ... http://www.healthscout.com/ency/1/199/main.html

Description of Ovarian Cancer

HealthScoutThe Kennels Kilchoan : Barguillean Cottage Taynuilt near Oban: Ardnamurchan ... Mossbank Cottage by Fort William: Barnhills Farmhouse - Kirkcolm near ... http://www.healthscout.com/ency/1/299/main.html

Hurthle Cell Carcinoma

KPLC TVMary's University is the oldest and the largest Catholic University in Texas and the ... One Camino Santa Maria • San Antonio, Texas 78228 • (210) 436-3011http://www.kplctv.com/Global/story.asp?S=1230208

More Fiber, Less Fat Help Prevent Ovarian Cancer

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Search results for Epithelial

epithelial duct - Definitions from Dictionary.com

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epithelial definition of epithelial in the Free Online Encyclopedia.

epithelium (?p'?th?`l??m), sheet of tissue that covers or lines the external and internal body surfaces. The epithelium is closely packed, has little intercellular material ... http://encyclopedia2.thefreedictionary.com/epithelial

Epithelial–Mesenchymal Interactions in Pulmonary Fibrosis

Semin Respir Crit Care Med. Author manuscript; available in PMC 2008 February 4.http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pub...

2740 EPITHELIAL TISSUES

CONNECTIVE TISSUE] [CARTILAGE and BONE] [UNIT 1 TEST] All epithelial tissues are found on a surface. They are distinguished from each other by their differences in cell shape and ... http://www.unomaha.edu/hpa/2740epithelium.html

epithelial - Hutchinson encyclopedia article about epithelial

In animals, tissue of closely packed cells that forms a surface or lines a cavity or tube. Epithelial cells line the inside surfaces of fluid or air-filled tubes and spaces within ... http://encyclopedia.farlex.com/epithelial
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Avian Flu: Antigenic Shift and the ...

Avian Flu: Antigenic Shift and the Spread of Avian InfluenzaOnly the influenza Type-A virus is capable of what is known as antigenic shift. Bird and human subtypes could simultaneously converge in airway epithelial host cells and...Flash - Video

Mesothelioma Lawyers News: Chicago,...

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New age technology for muscular and joint pain relief-Medlight 630 proNILT accelerates the healing activities of the body. Several of the unique characteristics of NILT that work to alleviate pain and inflammation also play a critical role in the...Flash - Video

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EUS Guided FNA of a Liver Mass

EUS Guided FNA of a Liver MassA 59 year old male with a history of T3, N1 esophageal adenocarcinoma underwent neoadjuvant radiation and chemotherapy followed by an esophagectomy and gastric pull-up procedure. Two years later a rou...msmedia: 2.8 MB w:480px - h:320px

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Intestine - Normal IleumThis is the appearance of the normal ileal mucosa as viewed through a standard video colonoscope under an aqueous medium. These delicate villi are 0.2 to 0.4 mm long and contribute significantly to th...realmedia: 4.2 MB w:480px - h:320px

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Answers for Epithelial

Jashwin S

How do I take out the skin(epithelial cells) inside my cheek?

Jashwin SJust use a Q-tip. It's easy to transfer to a slide and it works.
chisoxfan1998

Is stomach lining so well protected by mucus and tight junctions that its epithelial cells die slowly?

chisoxfan1998The entire GI (from mouth to anus) turnsover rapidly. Chemotherapy attacks rapidly dividing cells (cancer), but affects healthy ones as well. the GI die off is one of the things that make chemo pati...
cherrie j

what does it mean when you have epithelial cell abnormality on pap smear?

cherrie jsame thing 3 times! you do not have cancer, and you should be able to concieve you have HPV, thats the abnormal cells and the lesion the abnormal cells are on your cervix, you have three years to ...
cate

What does it mean that epithelial tissue has basal and apical surfaces?

cateOne major function of epithelial cells is both as a barrier and a pump. Think of the epithelial sheet lining your intestines - one face is open to the intestinal lumen, while the other is next to y...
Nicole P

How are cheek lining cells adapted to thier function? (epithelial cells)?

Nicole Phttp://www.scientia.org/cadonline/biology/specialcells/epithelial.ASP This should help!

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