EPITHELIUM

ĕpˌəthēˈlēəm, sheet of tissue that covers or lines the external and internal body surfaces. The epithelium is closely packed, has little intercellular material, and is lacking in blood vessels. There are three characteristic types of epithelial cells: squamous, cuboidal, and columnar. Squamous epithelial cells are flat and often overlapping; they compose the outer layer of skin (epidermis) and line certain internal cavities, e.g., the mouth. Cuboidal epithelial cells are rounded and elastic and line such structures as the urinary bladder, where, by stretching and becoming flatter, they increase the organ's capacity to hold fluid. The cells of the columnar epithelium are long and thin; they are found as a single layer of secretory and absorptive cells in the gastrointestinal tract, and they form the ciliated lining of the respiratory tract. Embryologically, epithelium may be derived from any of the three germ layers, i.e., ectoderm, mesoderm, and endoderm, and may be classified accordingly as epithelium proper, mesothelium, and endothelium.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Epithelium
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books on: Epithelium  - 416 results

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1.
The Gift of Speech: Readings in the Analysis of Speech and Voice
Book by John Laver; Edinburgh University Press, 1996
Subjects: Speech, Voice
...is divisible into four layers: an outer layer of epithelium and three layers of underlying connective tissue...the lamina propria see Figures 16.2 and 16.3 . EPITHELIUM Epithelium is the generic name for all the tissues which line...
2.
Principles of Experimental Phonetics
Book by Norman J. Lass; Mosby, 1996
Subjects: Phonetics, Experimental, Speech
...associated with voice production. The epithelium is composed of eight layers with...connective tissue underlying many simple epithelia. Its primary function is to bind...tissue fibers. Progressing from the epithelium to the muscle, the lamina propria...
3.
Hen's Teeth and Horse's Toes
Book by Stephen Jay Gould; W. W. Norton & Company, 1984
Subjects: Evolution (Biology)
...mesenchyme when deprived of contact with enamel epithelium as an inducer. But among fifty-five combined grafts of mouse mesenchyme and chick epithelium, ten produced dentin. Thus, chick epithelium is still capable of inducing mesenchyme...
4.
CIBA Foundation Symposium on Pulmonary Structure and Function
Book by A. V. S. De Reuck, Maeve O'Connor; A. Churchill Ltd., 1962
Subjects: Lungs--Congresses
...lymphoid tissue with lymphocytes entering the epithelium; the lymphocytes may be passing through the epithelium in the lumen of the ducts and so in the secreta. The same relation of epithelium and lymphocytes is found in diverticula of smaller...
5.
Encyclopedia of the Human Brain - Vol. 3
Book by V. S. Ramachandran; Academic Press, 2002
Subjects: Brain--Encyclopedias, Neurology--Encyclopedias, Neurosciences--Encyclopedias
...comparatively homogeneous epithelium along both its medial and...Neuroepithelium The olfactory epithelium, which contains the sensory...islands of respiratory-like epithelia appear a few weeks after birth...Surprisingly, the size of the epithelium in humans is still not well...
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journal articles on: Epithelium  - 404 results

       More journal Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Formation of Covalently Bound Protein Adducts from the Cytotoxicant Naphthalene in Nasal Epithelium: Species Comparisons
Journal article by Christina Destefano-Shields, Dexter Morin, Alan Buckpitt; Environmental Health Perspectives, Vol. 118, 2010
Subjects: Epithelium--Physiological aspects, Epithelium--Research, Naphthalene--Health aspects, Naphthalene--Research, Toxicity--Research, Toxicity--Risk factors
...the Cytotoxicant Naphthalene in Nasal Epithelium: Species Comparisons. by Christina...compared proteins adducted in nasal epithelium from rats and rhesus macaques in vitro...recovered from incubations of nasal epithelium and .sup.14C-naphthalene were separated...
2.
Serum Clara Cell Protein: A Sensitive Biomarker of Increased Lung Epithelium Permeability Caused by Ambient Ozone
Journal article by Fabrice Broeckaert, Karim Arsalane, Cedric Hermans, Enrico Bergamaschi, Angelita Brustolin, Antonio Mutti, Alfred Bernard; Environmental Health Perspectives, Vol. 108, 2000
...Sensitive Biomarker of Increased Lung Epithelium Permeability Caused by Ambient Ozone...evaluate the O.sub.3-increased lung epithelium permeability. In the present study...ambient O.sub.3 on the pulmonary epithelium by a new approach relying on the assay...
3.
Efficient Elimination of Inhaled Nanoparticles from the Alveolar Region: Evidence for Interstitial Uptake and Subsequent Reentrainment onto Airways Epithelium
Journal article by Manuela Semmler-Behnke, Shinji Takenaka, Steffanie Fertsch, Alexander Wenk, Jurgen Seitz, Paula Mayer, Gunter Oberdorster, Wolfgang G. Kreyling; Environmental Health Perspectives, Vol. 115, 2007
Subjects: Bronchoalveolar lavage--Research, Lung diseases--Risk factors, Macrophages--Research, Nanoparticles--Health aspects, Nanoparticles--Research
...Subsequent Reentrainment onto Airways Epithelium. by Manuela Semmler-Behnke , Shinji...studied the disappearance of NPs from the epithelium by sequential lung retention and clearance...retained Ir NPs was translocated into epithelium and interstitium. CONCLUSION: There...
4.
TRPV4-Mediated Calcium Influx into Human Bronchial Epithelia upon Exposure to Diesel Exhaust Particles
Journal article by Jinju Li, Patrick Kanju, Michael Patterson, Wei-Leong Chew, Seung-Hyun Cho, Ian Gilmour, Tim Oliver, Ryohei Yasuda, Andrew Ghio, Sidney A. Simon, Wolfgang Liedtke; Environmental Health Perspectives, Vol. 119, 2011
Subjects: Bronchi--Physiological aspects, Calcium (Nutrient)--Properties, Calcium, Dietary--Properties, Diesel emissions--Health aspects, Diesel motor exhaust gas--Health aspects, Epithelial cells--Physiological aspects
...Influx into Human Bronchial Epithelia upon Exposure to Diesel Exhaust...BACKGROUND: Human respiratory epithelia function in airway mucociliary...Thus, in a human airway epithelium-derived cell line with robust...signaling pathway in human airway epithelia that consists of a GPCR...
5.
Transient Receptor Potential-like Channels Are Essential for Calcium Signaling and Fluid Transport in a Drosophila Epithelium
Journal article by Matthew R. MacPherson, Valerie P. Pollock, Laura Kean, Tony D. Southall; Genetics, Vol. 169, 2005
Subjects: Cells, Proteins, Signal transduction
...Transport in a Drosophila Epithelium by Matthew R. MacPherson...model for fluid-secreting epithelia in which cell-specific signaling...expressed in these transporting epithelia. Surprisingly, then, data...proteins in vertebrate renal epithelia include the sodium/hydrogen...
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magazine articles on: Epithelium  - 76 results

       More magazine Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Cells' Root: Adult Stem Cells Have a Master Gene
Magazine article by P. Barry; Science News, Vol. 171, May 12, 2007
Subjects: Cell division--Observations, Epithelium--Genetic aspects, Epithelium--Physiological aspects, Genes--Identification and classification, Regeneration (Biology)--Research, Stem cells--Genetic aspects
2.
Bacterial Glue
Magazine article; The Scientist, Vol. 25, January 2011
Subjects: Bacteria, Bacterial infections, Kinases
...cell-renewal process. The intestinal epithelium is continually renewing itself. This...for a healthy individual to keep that epithelium. Otherwise bacteria that normally colonize...infection you also want to shed that epithelium to get rid of the bacteria. Shigella...
3.
A Focus on Vision
Magazine article by Carol Rados; FDA Consumer, Vol. 40, July 2006
Subjects: Eye diseases--Care and treatment, Eye diseases--Health aspects, Eye examination--Forecasts and trends, Eye--Forecasts and trends, Eye--Medical examination
...layer of cells covering the cornea, the epithelium, is removed, and the laser sculpts...hyperopia, and astigmatism. The epithelium, or outer surface of the cornea, is...cornea, but only to the surface. The epithelium is placed back into position, and a...
4.
Interstitial Cystitis
Magazine article by Deborah R. Erickson; National Forum, Vol. 78, Winter 1998
Subjects: Medical disorders, Urology
...the bladder wall, which we call the epithelium, is permeable, which means that it...substances in the urine can leak through the epithelium and irritate the bladder, causing symptoms. The epithelium contains a lot of glycoconjugates...
5.
The Regeneration Recipe
Magazine article by Megan Scudellari; The Scientist, Vol. 23, August 2009
Subjects: Medical research, Medicine, Stem cells, Studies
...removal of pigment from the dark iris epithelium. Four days later, the iris will begin...lens is injured or removed, dark iris epithelium cells revert to a dedifferentiated state...In the newt eye, dorsal pigmented epithelium cells (PEC) can regenerate the lens...
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newspaper articles on: Epithelium  - 24 results

       More newspaper Results: 1-10 11-20 21-24 >>  
 
1.
THE GOOD EYE LASER GUIDE; Tempted by the Idea of Laser Eye Surgery but Worried If It'll Work -- and Whether It's Safe? Here, with the Help of a Leading Expert, We Reveal the Pros and Cons of All the Different Methods
Newspaper article; The Daily Mail (London, England), June 30, 2009
...eyes, then manually scrapes off the epithelium -- the thin, protective layer of cells...placed on the eye to seal it while the epithelium grows back, which takes between four...very similar to PRK, but first the epithelium is softened with alcohol for 30 seconds...
2.
GOOD EYE THE LASER GUIDE; Good Health; Tempted by the Idea of Laser Eye Surgery but Worried If It'll Work -- and Whether It's Safe? Here, with the Help of the UK's Leading Experts, We Reveal the Pros and Cons of All the Different Methods
Newspaper article; The Daily Mail (London, England), April 28, 2009
...eyes, then manually scrapes off the epithelium -- the thin, protective layer of cells...placed on the eye to seal it while the epithelium grows back, which takes between four...very similar to PRK, but first the epithelium is softened with alcohol for 30 seconds...
3.
GOOD EYE THE LASER GUIDE; Good Health; Tempted by the Idea of Laser Eye Surgery but Worried If It'll Work - and Whether It's Safe? Here, with the Help of the UK's Leading Experts, We Reveal the Pros and Cons of All the Different Methods
Newspaper article; The Daily Mail (London, England), April 28, 2009
...eyes, then manually scrapes off the epithelium -- the thin, protective layer of cells...placed on the eye to seal it while the epithelium grows back, which takes between four...very similar to PRK, but first the epithelium is softened with alcohol for 30 seconds...
4.
THE GREAT LASER GAMBLE; Thousands Have Tried It in Search of Perfect Sight. but When Laser Eye Surgery Goes Wrong - and It Does - the Results Can Be Horrific and Irreversible. Here's What You MUST Know. Good Health
Newspaper article; The Daily Mail (London, England), September 21, 2004
...anaesthetised with drops, and then the epithelium - a thin layer which covers the eye...lasering was first introduced, the epithelium was scraped back and left to grow back...introduced. Instead of scraping away the epithelium, it was removed with a weak alcohol...
5.
Laser Saved My after Conjunctivitis; Infection: Marjory's Eyes Were Covered in White Bubbles
Newspaper article; The Daily Mail (London, England), November 11, 2008
...mine, conjunctivitis can affect the epithelium, the thin layer close to the front...the layer of corneal tissue below the epithelium. The cornea is usually clear but if...scarring there are white areas. The epithelium regenerates every seven days, so will...
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encyclopedia articles on: Epithelium  - 7 results

       More encyclopedia Results: 1-7 >>  
 
1.
Epithelium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
EPITHELIUM ep the le m, sheet of tissue that covers...external and internal body surfaces. The epithelium is closely packed, has little intercellular...hold fluid. The cells of the columnar epithelium are long and thin; they are found as...
2.
Fallopian Tube
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...end the long, slender fallopian tube opens into the uterus; the other end expands into a funnel shape near the ovary. The epithelium that lines the tube is covered with cilia that beat continuously toward the uterus. When an ovum is expelled into the peritoneal...
3.
Sleep
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...rate of breathing and heartbeat decrease. However, sleep is also a time of repair and growth, and some tissues, e.g., epithelium, proliferate more rapidly during sleep. In humans, sleep occurs in cyclical patterns; in each cycle of 1 1 / 2 to 2 hr...
4.
Anatomy
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...corresponding organs in humans and animals. There are four major types of tissue present in the human body: epithelial tissue (see epithelium ), muscular tissue (see muscle ), connective tissue , and nervous tissue (see nervous system ). Human anatomy is often...
5.
Skin Cancer
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...Carcinomas Basal and squamous cell carcinomas are the most common types of cancer. Both arise from epithelial tissue (see epithelium ). They are rare in dark-skinned people; light-skinned, blue-eyed people who do not tan well but who have had significant...
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