fatty tissue


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to fatty tissue: lipoma

tissue

 [tish´u]
a group or layer of similarly specialized cells that together perform certain special functions.
adenoid tissue lymphoid tissue.
adipose tissue connective tissue made of fat cells in a meshwork of areolar tissue.
areolar tissue connective tissue made up largely of interlacing fibers.
bony tissue osseous tissue.
brown adipose tissue (brown fat tissue) brown fat.
bursa-equivalent tissue (bursal equivalent tissue) a hypothesized lymphoid tissue in nonavian vertebrates including human beings, equivalent to the bursa of Fabricius in birds: the site of B lymphocyte maturation. It now appears that B lymphocyte maturation occurs primarily in the bone marrow.
cancellous tissue the spongy tissue of bone.
cartilaginous tissue the substance of cartilage.
chordal tissue the tissue of the notochord.
chromaffin tissue a tissue composed largely of chromaffin cells, well supplied with nerves and vessels; it occurs in the adrenal medulla and also forms the paraganglia of the body.
cicatricial tissue the dense fibrous tissue forming a cicatrix, derived directly from granulation tissue; called also scar tissue.
connective tissue the tissue that binds together and is the support of the various structures of the body; see also connective tissue.
elastic tissue connective tissue made up of yellow elastic fibers, frequently massed into sheets.
endothelial tissue peculiar connective tissue lining serous and lymph spaces.
epithelial tissue a general name for tissues not derived from the mesoderm.
erectile tissue spongy tissue that expands and becomes hard when filled with blood.
fatty tissue connective tissue made of fat cells in a meshwork of areolar tissue.
fibrous tissue the common connective tissue of the body, composed of yellow or white parallel elastic and collagen fibers.
gelatinous tissue mucous tissue.
granulation tissue material formed in repair of wounds of soft tissue, consisting of connective tissue cells and ingrowing young vessels; it ultimately forms cicatrix.
gut-associated lymphoid tissue (GALT) lymphoid tissue associated with the gut, including the tonsils, Peyer's patches, lamina propria of the gastrointestinal tract, and appendix.
indifferent tissue undifferentiated embryonic tissue.
interstitial tissue connective tissue between the cellular elements of a structure.
lymphadenoid tissue tissue resembling that of lymph nodes, spleen, bone marrow, tonsils, and lymph vessels.
lymphoid tissue a latticework of reticular tissue whose interspaces contain lymphocytes.
mesenchymal tissue embryonic connective tissue composed of stellate cells and a ground substance of coagulable fluid.
mucous tissue a jellylike connective tissue, such as occurs in the umbilical cord. Called also gelatinous tissue.
muscular tissue the substance of muscle.
myeloid tissue red bone marrow.
nerve tissue (nervous tissue) the specialized tissue forming the elements of the nervous system.
osseous tissue the specialized tissue forming the bones.
reticular tissue (reticulated tissue) connective tissue composed predominantly of reticulum cells and reticular fibers.
scar tissue cicatricial tissue.
sclerous t's the cartilaginous, fibrous, and osseous tissues.
skeletal tissue the bony, ligamentous, fibrous, and cartilaginous tissue forming the skeleton and its attachments.
splenic tissue red pulp.
subcutaneous tissue the layer of loose connective tissue directly under the skin.
tissue typing identification of tissue types for purposes of predicting acceptance or rejection of grafts and transplants. The process and purposes of tissue typing are essentially the same as for blood typing. The major difference lies in the kinds of antigens being evaluated. The acceptance of allografts depends on the hla antigens (HLA); if the donor and recipient are not HLA identical, the allograft is rejected, sometimes within minutes. The HLA genes are located in the major histocompatibility complex, a region on the short arm of chromosome 6, and are involved in cell-cell interaction, immune response, organ transplantation, development of cancer, and susceptibility to disease. There are five genetic loci, designated HLA-A, HLA-B, HLA-C, HLA-D, and HLA-DR. At each locus, there can be any of several different alleles.



Each person inherits one chromosome 6 from the mother and one from the father; that is, each parent transmits to the child one allele for each kind of antigen (A, B, C, D, and DR). If the parents are different at both alleles of a locus, the statistical chance of one sibling being identical to another is one in four (25 per cent), the chance of being identical at one allele only (half-identical) is 50 per cent, and the chance of a total mismatch is 25 per cent.
Techniques for Tissue Typing. Histocompatibility testing involves several basic methods of assay for HLA differences. The most widely used method uses the polymerase chain reaction to compare the DNA of the person, organ, or graft being tested with known pieces of the genes encoding MHC antigens. The variability of these regions of the genes determines the tissue type of the subject.



Serologic methods are used to detect serologically defined antigens on the surfaces of cells. In general, HLA-A, -B, and -C determinants are primarily measured by serologic techniques. A second method, involving lymphocyte reactivity in a mixed lymphocyte culture, for determining HLA-D or lymphocyte-defined antigens, is now only rarely used.

Essentially, the serologic method is performed by incubating target lymphocytes (isolated from fresh peripheral blood) with antisera that recognize all known HLA antigens. The cells are spread in a tray with microscopic wells containing various kinds of antisera and are incubated for 30 minutes, followed by an additional 60-minute complement incubation. If the lymphocytes have on their surfaces antigens recognized by the antibodies in the antiserum, the lymphocytes are lysed. A dye is added to show changes in the permeability of the cell membrane and cellular death. The proportion of cells destroyed by lysis indicates the degree of histologic incompatibility. If, for example, the lymphocytes from a person being tested for HLA-A3 are destroyed in a well containing antisera for HLA-A3, the test is positive for this antigen group.
white adipose tissue (yellow adipose tissue) the adipose tissue composing the bulk of the body fat.

fat·ty tis·sue

1. Synonym(s): adipose tissue
2. in some animals, brown fat.

fatty tissue

Etymology: AS, faett + OFr, tissu
loose connective tissue with many cells that contain fat vacuoles. Also called adipose tissue.

tissue

(tish'oo) [Fr. tissu, from L. texere, to weave]
A group or collection of similar cells and their intercellular substance that perform a particular function. The four major groups are epithelial, connective, muscular, and nervous tissues.

adipose tissue

Fat.

areolar tissue

A form of loose connective tissue consisting of fibroblasts in a matrix of tissue fluid and collagen and elastin fibers. Many white blood cells are present. It is found subcutaneously and beneath the epithelium of all mucous membranes. See: connective tissue for illus
Enlarge picture
BONE TISSUE

bone tissue

Osseous tissue.illustration

bronchus-associated lymphoid tissue

Abbreviation: BALT
Lymph nodules that contain clusters of T and B lymphocytes and macrophages within the mucosa of the bronchial wall; a component of the mucosal immune system that defends all mucosal surfaces against pathogens.
See: mucosal immune system

brown adipose tissue

Abbreviation: BAT
Brown fat..

cancellous tissue

Spongy bone with many marrow cavities. It is present at the ends of long bones and in the interior of most flat bones.

chondroid tissue

Embryonic cartilage.

chordal tissue

Tissue of the notochord or derived from it. The nucleus pulposus is derived from the notochord.

chromaffin tissue

Chromaffin system.

cicatricial tissue

Scar.
Enlarge picture
CONNECTIVE TISSUES

connective tissue

Tissue that supports and connects other tissues and parts of the body. Connective tissue has comparatively few cells. Its bulk consists of intercellular substance or matrix, whose nature gives each type of connective tissue its particular properties. The vascular supply varies: cartilage, none; fibrous, poor; adipose, good; and bone, abundant. Connective tissue includes the following types: areolar, adipose, fibrous, elastic, reticular, cartilage, and bone. Blood may also be considered a connective tissue.
illustration

elastic tissue

A form of connective tissue in which yellow elastic fibers predominate. It is found in certain ligaments, the walls of blood vessels, esp. the larger arteries, and around the alveoli of the lungs.

embryonic tissue

Any tissue that arises from the fertilization of an ovum and has not become differentiated or specialized.

endothelial tissue

Endothelium.

epithelial tissue

Epithelium.

erectile tissue

Spongy tissue, the spaces of which fill with blood, causing it to harden and expand. It is found in the penis, clitoris, and nipples.

fatty tissue

Fat.

fibrous tissue

Connective tissue consisting principally of collagen fibers. Also called white fibrous or dense connective tissue; may be regular (parallel fibers) or irregular.

gelatiginous tissue

Tissue from which gelatin may be obtained by treating it with hot water.

glandular tissue

A group of epithelial cells capable of producing secretions.

granulation tissue

The newly formed vascular and connective tissue produced in the early stages of wound healing.

hard tissue

In dentistry, the term used to denote any of the three calcified tissue components of the tooth: enamel, dentin, and cementum.

homologous tissues

Tissues that are identical in structure.

indifferent tissue

Tissue composed of undifferentiated cells as in embryonic tissue.

interstitial tissue

Connective tissue that forms a network with the cellular portions of an organ.

lymphadenoid tissue

Aggregates of lymphatic tissue found in the spleen and lymph nodes.

lymphoid tissue

Collections of lymphocytes in all stages of development found in the spleen, thymus, lymph nodes, lymph nodules of the digestive tract (tonsils, Peyer's patches), and the respiratory, urinary, and reproductive tracts.

mesenchymal tissue

The embryonic mesenchyme.

mucosa-associated lymphoid tissue

Abbreviation: MALT
Aggregates of T and B lymphocytes found in all mucous membranes, a line of defense against infection. Examples include Peyer's patches in the small intestine and lymph nodules in the colon, trachea, and bronchi. MALT contains CD4+ and CD8+ T cells and activated B cells and may occasionally undergo malignant transformation into lymphomas.
See: mucosal immune system

mucous tissue

The jellylike connective tissue of the umbilical cord.

muscular tissue

Muscle.

myeloid tissue

The bone marrow in which most blood cells are formed.

nerve tissue

The neurons and neuroglia of the nervous system.
See: neuron

osseous tissue

Bone, a connective tissue with a matrix of calcium phosphate and calcium carbonate surrounding osteocytes
Synonym: bone tissue See: bone

reticular tissue

A type of connective tissue consisting of delicate fibers forming interlacing networks. Fibers stain selectively with silver stains and are called argyrophil fibers. Reticular tissue supports blood cells in lymph nodes, bone marrow, and the spleen.

scar tissue

Scar.

sclerous tissue

Firm connective tissue such as bone and cartilage.

skeletal tissue

Bone.

soft tissue

Any noncalcified tissue in the body. This term is especially used in relation to muscles, tendons, ligaments, skin, fat, and other connective tissues that are occasionally the source of pain when they are injured. Unlike bones or joints, which can be fractured or dislocated, soft tissues are bruised or inflamed by trauma. In surgery, soft tissues are dissected. By contrast, components of the (hard) bony skeleton are sawed, chiselled, or drilled. Soft tissues include all types of tissue except bone, i.e., all epithelial, muscle, and nerve tissue, as well as connective tissue excluding bone.

splenic tissue

The highly vascular splenic pulp.

subcutaneous tissue

Superficial fascia.

fatty

pertaining to or characterized by fat. See also adipose.

fatty acids
organic compounds of carbon, hydrogen and oxygen that are esterified with glycerol to form fat. All fats are esters of fatty acids and glycerol, the fatty acids accounting for 90% of the molecule of most natural fats. A fatty acid consists of a long chain of carbon atoms with a carboxylic acid group at one end. Saturated fatty acids have no double bonds in the carbon chain. The medium and long chain fatty acids are solid at room temperature and are the components of the common animal fats, such as butter and lard. Unsaturated fatty acids contain one or more double bonds. The unsaturated fatty acids are liquid at room temperature and are found in oils such as olive oil and linseed oil. Polyunsaturated fatty acids have two or more double bonds.
Volatile fatty acids (VFAs) including acetic, butyric and propionic acids are produced in large quantities in the rumen by the fermentative digestion of cellulose. Much of the energy consumption of ruminants comes from these VFAs in the situation in which other animals use glucose. See also 3-omega fatty acid (below).
fatty acid nutritional deficiency
a secondary deficiency occurs in pigs on high-calcium diets. This may have a connection with parakeratosis of pigs caused by zinc deficiency and calcium excess in the diet. Requirements for dietary fat in dogs and cats are usually expressed as the essential linoleic acid and arachidonic acid.
fatty acid synthase
in bacteria, a multiprotein complex; in mammals, a single multifunctional protein important in the synthesis of palmitate as a major source of fatty acids.
fatty acyl CoA
generic term for long hydrocarbon chains, generally between C12 and C20, linked via thioester to coenzyme A.
fatty acyl CoA:cholesterol acyltransferase
enzyme (ACAT) catalyzing the transfer of fatty acyl group to cholesterol, irreversible physiologically. Its action regulates the number of LDL receptors by converting excess cholesterol (which inhibits LDL receptors) to cholesterol esters.
branched chain fatty acids
fatty acids usually containing a methyl branch; lowers the melting point compared with the equivalent straight chain fatty acid.
fatty casts
see urinary cast.
fatty degeneration
deposit of fat globules in a tissue.
essential fatty acids (EFA)
essential fatty acids.
fatty liver
accumulation of fat in a liver beyond the level which is normally encountered may be a result of a normal physiological response to increased peripheral lipolysis, obesity or the action of hepatotoxins.
fatty liver disease
see fat cow syndrome.
fatty liver syndrome
1. a disease of laying birds housed in battery cages. The cause is unknown. Affected birds are significantly heavier, there is a fall in egg production and they die acutely of liver rupture. The liver is greasy, mushy in consistency and yellow in color.
2. a severe fatty accumulation in the liver and hypertriglyceridemia that may develop in obese cats that are anorexic. There is jaundice, weight loss, neurological signs and a high mortality. Called also idiopathic feline hepatic lipidosis.
omega-3 (n-3) fatty acids
include α-linolenic acid, eicosapentanoic acid, docosahexanoic acid. High concentrations found in cold water marine (fish) oils.
omega-6 (n-6) fatty acids
found in terrestrial plants, including safflower oil, corn oil and evening primrose oil, which is a rich source of linoleic and arachidonic acids.
fatty tissue
connective tissue made of fat cells in a meshwork of areolar tissue.
References in periodicals archive ?
Although, gross fatty tissue in thyroid gland is very rare incidence, but if it is seen then whole spectrum of various conditions remains as open possibility.
In this example, the proposed method is validated when tumors are embedded in the fatty tissue.
Surgeons removed fatty tissue from each patient's abdomen and placed it in a machine that separates fat cells from stem cells.
The lump turned out to be fatty tissue, but I was so glad I'd gone because it put my mind at rest.
Without slicing a millimeter of the frog's skin, the students see images of the animal's veins, heart and fatty tissue hovering over the specimen.
Happily, the lump she had noticed turned out to be nothing more than fatty tissue.
It accumulates in fatty tissue and causes several health problems, even at low levels.
This means that they bind to sediment and organic matter in the environment and are absorbed in animal and human fatty tissue.
And another patient, retired bank worker June McNeil, has lodged a complaint against the surgeon after he told her a lump in her left breast - later found to be cancerous - was just fatty tissue.
When the system is in use, a small needle--connected to a tube and inserted into the fatty tissue of the abdomen--measures the glucose level in the tissue every 10 seconds and sends a quantitatively proportionate electronic signal to a monitor to which it is connected.
Marrow is the soft, vascular, fatty tissue that forms in most bones.
The fish showing the highest concentrations of chemicals contained 360 nanograms of PCB per gram of fatty tissue, 300 nanograms of DDT, 45 nanograms of organic tin and 25 nanograms of BHC, the researchers said.