tissue (tish´u)

A collection of similar cells and the intercellular substances surrounding them. There are four basic tissues in the body: 1) epithelium; 2) the connective tissues, including blood, bone, and cartilage; 3) muscle tissue; and 4) nerve tissue. [Fr. tissu, woven, fr. L. texo, to weave]
adenoid t. lymphatic t
adipose t. a connective t. consisting chiefly of fat cells surrounded by reticular fibers and arranged in lobular groups or along the course of one of the smaller blood vessels.fat (1), fatty t. (1), white fat (1);
areolar t. loose, irregularly arranged connective t. that consists of collagenous and elastic fibers, a protein polysaccharide ground substance, and connective t. cells (fibroblasts, macrophages, mast cells, and sometimes fat cells, plasma cells, leukocytes, and pigment cells).
bone t. osseous t
brown adipose t. brown fat
cancellous t. latticelike or spongy osseous t.
cardiac muscle t. See cardiac muscle.
cartilaginous t. See cartilage.
cavernous t. erectile t
chondroid t. 1. in an adult, t. resembling cartilage;fibrohyaline t., pseudocartilage; 2. in an embryo, an early stage in cartilage formation.
chromaffin t. a cellular t., vascular and well supplied with nerves, made up chiefly of chromaffin cells; it is found in the medulla of the suprarenal glands and, in smaller collections, in the paraganglia.
connective t. the supporting or framework t. of the animal body, formed of fibrous and ground substance with more or less numerous cells of various kinds; it is derived from the mesenchyme, and this in turn from the mesoderm; the varieties of connective t. are: areolar or loose; adipose; dense, regular or irregular, white fibrous; elastic; mucous; and lymphoid t.; cartilage; and bone; the blood and lymph may be regarded as connective t.'s the ground substance of which is a liquid.interstitial t., tela conjunctiva;
dartoic t. t. resembling tunica dartos.
elastic t. a form of connective t. in which the elastic fibers predominate; it constitutes the ligamenta flava of the vertebrae and the ligamentum nuchae, especially of quadrupeds; it occurs also in the walls of the arteries and of the bronchial tree, and connects the cartilages of the larynx.elastica (2), tela elastica;
epithelial t. See epithelium.
erectile t. a t. with numerous vascular spaces that may become engorged with blood.cavernous t;
fatty t. 1. adipose t 2. in some animals, brown fat.
fibrohyaline t. chondroid t. (1)
fibrous t. a t. composed of bundles of collagenous white fibers between which are rows of connective t. cells; the tendons, ligaments, aponeuroses, and some of the membranes, such as the dura mater.
Gamgee t. a thick layer of absorbent cotton between two layers of absorbent gauze, used in surgical dressings.
gelatinous t. mucous connective t
gingival t.'s See gingiva.
granulation t. vascular connective t. forming granular projections on the surface of a healing wound, ulcer, or inflamed t. surface. See also granulation.
gut-associated lymphoid t. (GALT) (lim´foid) lymphoid t. of the gastrointestinal tract that is especially rich in B cells. This t. is responsible for localized immunity to pathogens such as bacteria, viruses, and parasites.
Haller's vascular t. vascular lamina of choroid
hard t. 1. t. that has become mineralized; 2. t. having a firm intercellular substance, e.g., cartilage and bone.
hemopoietic t. t. in which there is a development of blood cells or other formed elements.
indifferent t. undifferentiated, nonspecialized, embryonic t.
interstitial t. connective t
investing t.'s the t.'s covering or enclosing a structure.
islet t. islets of Langerhans, under islet
lymphatic t. , lymphoid t. a three-dimensional network of reticular fibers and cells the meshes of which are occupied in varying degrees of density with lymphocytes; there is nodular, diffuse, and loose lymphatic t.adenoid t;
mesenchymal t. embryonic connective tissue. See mesenchyme.
mesonephric t. intermediate mesoderm situated in the thoracic and lumbar regions of the embryo or fetus; it evolves into the mesonephros and associated structures.
metanephrogenic t. t. derived from the intermediate mesoderm caudal to mesonephric levels and concerned with the formation of the nephrons of the metanephros.
mucous connective t. a type of connective t. little differentiated beyond the mesenchymal stage; its ground substance of glycoproteins is abundant and contains fine collagenous fibers and fibroblasts; in its most characteristic form, it appears in the umbilical cord as Wharton's jelly.gelatinous t;
multilocular adipose t. brown fat
muscular t. a t. characterized by the ability to contract upon stimulation; its three varieties are skeletal, cardiac, and smooth. See muscle.flesh (2);
myeloid t. bone marrow consisting of the developmental and adult stages of erythrocytes, granulocytes, and megakaryocytes in a stroma of reticular cells and fibers, with sinusoidal vascular channels.
nasion soft t. the outer point of intersection between the nasion-sella line and the soft tissue profile.
nephrogenic t. the t. from which the pronephros, mesonephros, and metanephros develop.
nervous t. a highly differentiated t. composed of nerve cells, nerve fibers, dendrites, and a supporting t. (neuroglia).
nodal t. See atrioventricular node, sinuatrial node.
osseous t. a connective t., the matrix of which consists of collagen fibers and ground substance and in which are deposited calcium salts (phosphate, carbonate, and some fluoride) in the form of an apatite.bone t;
osteogenic t. a connective t. with the property of forming osseous t.
osteoid t. osseous t. prior to calcification.
periapical t. the structures adjacent to a root apex, particularly the periodontal ligament and bone.
reticular t. , retiform t. a t. in which the argyrophilic collagenous fibers form a network and that usually has a network of reticular cells associated with the fibers.
rubber t. a thin sheet of rubber used as a cover in surgical dressings.
skeletal muscle t. See skeletal muscle.
smooth muscle t. See smooth muscle.
subcutaneous t. a layer of loose, irregular, connective t. immediately beneath the skin and closely attached to the corium by coarse fibrous bands, the retinacula cutis; it contains fat cells except in the auricles, eyelids, penis, and scrotum.


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