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Topic: Epithelial tissue


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  BIOL 237 Class Notes - Histology
Epithelial tissue - found as the lining and covering of organs and body cavities, the secretory parts of organs and glands, the transport membranes of capillaries and alveolar sacs, and membranes which lubricate organs.
Epithelial tissue is composed of closely packed cells, anchored by a basement membrane consisting of a basal lamina made of glycoprotein (similar to the glycocalyx on the apical surface) and a reticular lamina made of collagen.
Epithelial tissue in the skin, in the linings of organs in the GI and respiratory tracts, in the liver, in many glands, and in blood vessels can all replace and repair themselves, the limiting factor generally being the degree of damage and other nutritive and health factors.
webanatomy.net /anatomy/histology_printer.htm   (1846 words)

  
 Tissue - MSN Encarta
Tissue, group of associated, similarly structured cells that perform specialized functions for the survival of the organism (see Physiology).
Animal tissues, to which this article is limited, take their first form when the blastula cells, arising from the fertilized ovum, differentiate into three germ layers: the ectoderm, mesoderm, and endoderm (see Embryology: Normal Development in Animals).
These tissues, which support and hold parts of the body together, comprise the fibrous and elastic connective tissues, the adipose (fatty) tissues, and cartilage and bone.
encarta.msn.com /encyclopedia_761554781/Tissue.html   (559 words)

  
 Epithelial Tissue
Epithelial tissues are physically separated from underlying connective tissues by a basement membrane (also called the basal lamina).
Epithelial cells covering the cornea and lens, as well as sensory receptors of the eyes, ears, and nose, are also ectodermal in origin.
Types of Epithelial Tissues: The nomenclature of epithelial tissues classifies them according to the shape of their component cells, whether they are organized in sheets of single-cells or layers of many cells, and by their general functions.
medinfo.ufl.edu /pa/chuck/summer/handouts/epi.htm   (1627 words)

  
 SIU SOM Histology INTRO
Epithelial tissue thus serves both as a protective barrier for the body and as an active interface with the environment.
Epithelial cells are separated from the underlying tissue by a basement membrane.
Even when an epithelial surface seems to be penetrated by a hole (such as a the pore of a gland) that hole is really just an invagination of the epithelium (i.e., the glandular duct is itself lined by epithelium, and the secretory portion of the gland is also epithelial tissue).
www.siumed.edu /~dking2/intro/epith.htm   (2143 words)

  
 Introduction of Human Physiology Part2
One surface of the epithelial sheet is always attached to an underlying layer, called the basement membrane, composed of a fibrous polysaccharide material produced by the epithehal cells themselves.
Epithelial tissues may consist of only a single layer of cells (simple epithelium), as found in the inner lining of the circulatory system, or several layers (stratified epithelium), as found in the outer layer (epidermis) of the skin.
Unlike epithelial tissue cells, the cells of connective tissue are widely separated from one another by large amounts of intercellular material, the matrix, which anchors and supports the tissue.
home.earthlink.net /~dayvdanls/IHP2.html   (1708 words)

  
 Exercise1
Epithelial tissues may be classified as simple, if they are only one layer thick, or stratified, if they are two or more layers thick Pseudostratified tissues are actually one one layer thick, but they give the impression of multiple layers because the nuclei of their cells are located at different levels.
Epithelial tissues may be further classified by the shape of their surface cells as squamous (if the cells are flat and shingle like), cuboidal, or columnar.
Epithelial tissue is seen as the epidermis, the hairfollicies, and the sebaceous glands that extend from the hair follicles.
www.public.coe.edu /~kredborg/phys/Exercise1a.htm   (1345 words)

  
 Epithelial tissue
Epithelial tissue that occurs on surfaces on the interior of the body is known as endothelium.
Epithelial tissue, regardless of the type, is usually separated from the underlying tissue by a thin sheet of connective tissue; basement membrane.
Epithelial tissue can be divided into two groups depending on the number of layers of which it is composes.
www.botany.uwc.ac.za /sci_ed/grade10/mammal/Epithelial.htm   (838 words)

  
 Epithelium Summary
All epithelial cells have a so-called apical side, which is oriented toward the outside world (be that the lung or the intestinal tract or the true outside world, in the case of the skin) and a so-called basal side, which is oriented towards the basement membrane.
Epithelial tissues are comprised of continuous sheets of cells that cover the body, line the digestive tract and other body cavities, and form glands.
Epithelial cells are anatomically separated from the underlying connective tissue by a basement membrane.
www.bookrags.com /Epithelium   (2154 words)

  
 Epithelial Tissue
Epithelial tissues come in three basic types: squamous, cuboidal and columnar.
The tall, vertical cells seen at the top of the tissue are columnar cells (one is shown - red arrow), which make up simple columnar epithelium (the cells at the bottom of the image are connective tissue, which will be discussed later).
The cells of the basal layer of the epidermis (closest to the dermis) are cuboidal to columnar in shape.
www.uoguelph.ca /zoology/devobio/210labs/epithelial1.html   (940 words)

  
 Epithelial Tissue
Epithelial tissue is located on the very outside of an organ or organism (i.e.
Epithelial tissue is also avascular (no blood vessels) and must depend on underlying tissues for the nutrients and oxygen it needs to maintain homeostasis.
Another characteristic of epithelial tissue is that it has little to no intercellular matrix between it's cells.
www.mc.maricopa.edu /~minckley/anatomy/epithelial_tissue.html   (104 words)

  
 Epithelial Cells   (Site not responding. Last check: 2007-10-13)
The outside surfaces of epithelial tissues often are highly specialized in other ways possessing cilia, hairs, or glands, which may arise from individual cells or groups of cells that have invaginated and which are capable of covering the outer surface of an epithelial tissue with mucous or waxy secretions.
Simple epithelial tissues are only one cell-layer thick and are named on the basis of their cell type: Simple squamous, simple cuboidal, and simple columnar epithelia are the three types of simple epithelial tissues.
In stratified epithelial tissues, the outermost layer of cells determines the name of the tissue: Stratified squamous, stratified cuboidal, and stratified columnar epithelia are the three types of stratified epithelial tissues.
www.scientia.org /cadonline/Biology/specialcells/epithelial.ASP   (344 words)

  
 Histology Lab Part I - Epithelium
Epithelial tissues are categorized by the shape of the cell and the number of cell layers.
Epithelial tissues usually have a first, middle and last name (transitional epithelium is the only exception to this rule).
Epithelial tissue always has a membrane upon which the layers of epithelial cells rest and this membrane is called the basement membrane.
faculty.nhmccd.edu /manewsome/Histology_lab1.html   (1024 words)

  
 Epithelial Tissue Support
Epithelial Tissue Support is enhanced with PEAK ATP to nourish cells and encourage cellular regeneration so your tissues remain strong and continue to defy the laws of aging.
Epithelial tissues are what protect your more precious interior parts from major injury, standing before the connective, muscle and nervous tissues like guardsmen.
And surprise: your epithelial tissues are anchored to connective tissue at the basement membrane.
www.mindbodyhealth.com /Roex/Epithelial.htm   (2037 words)

  
 Epithelium - Wikipedia, the free encyclopedia
In dermatology epithelium is a tissue composed of a layer of 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.
Glands are formed from the invagination / infolding of epithelial cells and subsequent growth in the underlying connective tissue.
en.wikipedia.org /wiki/Epithelial_tissue   (735 words)

  
 Tissue Page   (Site not responding. Last check: 2007-10-13)
Four basic tissue types are required to form an organ: epithelial tissue, connective tissue, muscle tissue, and nervous tissue.
Epithelial tissues either cover things (like organs or the body) or line things (like organs or glands).
It is found as articular cartilage on all bones, and as structural cartilage in the nose, between the ribs and sternum, and in the trachea.
www.esg.montana.edu /esg/kla/ta/tissues.html   (1446 words)

  
 General Science Information - Types of Tissue   (Site not responding. Last check: 2007-10-13)
The epithelial tissue remaining in the carcass is associated with the blood and lymph vessels as well as the edible organs such as the kidney and liver.
Although a wide variety of tissues such as adipose tissue (fat), cartilage, and bone are considered to be connective tissues, Connective tissue proper such as tendons and ligaments are the tissues that usually come to mind when one thinks of connective tissue.
Elastin is a rubbery, connective tissue protein which is present throughout the body in ligaments and arterial walls as well as a number of organs including muscle.
ag.ansc.purdue.edu /meat_quality/gen_sci_tissue_types.html   (970 words)

  
 Tissues   (Site not responding. Last check: 2007-10-13)
Epithelial tissue often has one free surface that is not associated with other cells and a basal surface which is attached to a basement membrane.
Epithelial cells retain their ability to reproduce and therefore are capable of generating new cells to replace damaged epithelial cells.
Epithelial tissue are classified according to the arrangement of cell layers and cell shape.
www.pitt.edu /~anat/Other/Tissues/Tissues.htm   (891 words)

  
 Cells, Tissues, and Membranes / Body Tissues
Tissue is a group of cells that have similar structure and that function together as a unit.
The intercellular matrix may contain special substances such as salts and fibers that are unique to a specific tissue and gives that tissue distinctive characteristics.
There are four main tissue types in the body: epithelial, connective, muscle, and nervous.
training.seer.cancer.gov /module_anatomy/unit2_2_body_tissues.html   (96 words)

  
 ANIMAL TISSUES   (Site not responding. Last check: 2007-10-13)
This classification of animal tissues applies primarily to vertebrate tissues and is not entirely applicable to invertebrate tissues.
Epithelial cells are tightly arranged, forming a continuous layer of cells.
Therefore, the different types of epithelial tissues are simple and stratified squamous epithelium, simple and stratified cuboidal epithelium, and simple and stratified columnar epithelium.
www.usd.edu /biol/labs/151/tisu51.htm   (2174 words)

  
 Basic Anatomy - Organs & Organ Systems
Epithelial tissue serve as membranes lining organs and helping to keep the body's organs separate, in place and protected.
Some examples of epithelial tissue are the outer layer of the skin, the inside of the mouth and stomach, and the tissue surrounding the body's organs.
It consists of epithelial tissue in which the cells are tightly packed together providing a barrier between the inside of the body and the outside world.
web.jjay.cuny.edu /~acarpi/NSC/14-anatomy.htm   (1087 words)

  
 histology-2   (Site not responding. Last check: 2007-10-13)
Secretory epithelium is usually found organized in the form of glands, which are groups of epithelial cells that have grown down into the underlying tissue during development, from a surface epithelial membrane.
Glands are special types of epithelial tissue whose cells produce specific chemicals for use elsewhere in the body, such as digestive enzymes, or hormones (Perry and Morton, Fig.
Unlike epithelial cells, these cells are often not in direct contact with neighboring cells: the cells are separated by the matrix.
www.ns.purchase.edu /biology/bio1560lab/histology-2.htm   (2525 words)

  
 Epithelial tissue
The first of the basic tissues we will be discussing is epithelia, the simplest of the four basic tissues.
An epithelial membrane consists of a continuous sheet of cells, one or more layers thick, which is attached to the underlying connective tissue by a basement membrane.
The gland is surrounded by a connective tissue capsule, projections of which may extend into the gland as trabeculae.
anatomy.iupui.edu /courses/histo_D502/D502f02/Epithelia/Epithelia.html   (1788 words)

  
 Epithelial Tissue in Asthmatics Lacks Important Protein: Presented at WAC   (Site not responding. Last check: 2007-10-13)
Because of their weakened epithelial defenses, the amount of respiratory viruses that multiply in the airways of these patients is about 50 times greater than that seen in the general population.
Research has shown that the epithelial cells lining the airways of asthma patients appear to produce much less of the virus-fighting protein interferon-beta than is seen in people without asthma, said Dr. Holgate.
In tissue culture, the epithelial cells from asthma patients are markedly weaker than those taken from other people, he said.
www.pslgroup.com /dg/24ea76.htm   (506 words)

  
 Introduction to Epithelial Tissue
Epithelial cells produce very small quantities of intercellular material and are frequently so closely bound to one another that cell-to-cell junctions are sometimes difficult to recognize.
The free (or apical) surfaces of nonglandular epithelial cells display a variety of surface modifications (microvilli, brush border, cilia, or flagella), while the basal or attached surfaces are typically found to rest or sit on what has classically been called a "basement membrane".
If the surface tissue is two or more cell layers thick and the cells at the free surface are flattened, then the tissue is classified as stratified squamous epithelium.
www3.umdnj.edu /histsweb/lab2/lab2introduction.html   (302 words)

  
 epithelial - Search Results - MSN Encarta
Epithelium, in anatomy, a layer of cells that serves as a protective covering over some surface, such as the outside of an organ or the lining of...
These tissues include the skin and the inner surfaces of the body, such as those of the lungs, stomach, intestines, and blood vessels.
- forming a protective layer of surface tissue: describes tissue that forms a thin protective layer on exposed bodily surfaces and forms the lining of internal cavities, ducts, and organs
ca.encarta.msn.com /epithelial.html   (112 words)

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