epithelial


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epithelial

 [ep″ĭ-the´le-al]
pertaining to or composed of epithelium.

ep·i·the·li·al

(ep'i-thē'lē-ăl),
Relating to or consisting of epithelium.

epithelial

adjective Referring to epithelium, which lines internal and external surfaces of the body.

ep·i·the·li·al

(ep'i-thē'lē-ăl)
Relating to or consisting of epithelium.

epithelium

(ep?i-the'le-um) ('le-a) plural.epithelia [ epi- + Gr. thele, nipple, teat + -ium (2)]
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GLANDULAR EPITHELIUM: (Orig. mag. ×430)
The layer of cells forming the epidermis of the skin and the surface layer of mucous and serous membranes. The cells rest on a basement membrane and lie in close approximation with little intercellular material between them. They are devoid of blood vessels. The epithelium may be simple, consisting of a single layer, or stratified, consisting of several layers. Cells making up the epithelium may be flat (squamous), cube-shaped (cuboidal), or cylindrical (columnar). Modified forms of epithelium include ciliated, pseudostratified, glandular, and neuroepithelium. The epithelium may include goblet cells, which secrete mucus. Stratified squamous epithelium may be keratinized for a protective function or abnormally keratinized in pathological response. Squamous epithelium is classified as endothelium, which lines the blood vessels and the heart, and mesothelium, which lines the serous cavities. Epithelium serves the general functions of protection, absorption, and secretion, and specialized functions such as movement of substances through ducts, production of germ cells, and reception of stimuli. Its ability to regenerate is excellent; it may replace itself as frequently as every 24 hr. See: illustration; skinepithelial (-al), adjective

ciliated epithelium

Epithelium with hairlike processes on the surface that wave actively only in one direction. This type is present in the respiratory tract and fallopian tubes.

columnar epithelium

Epithelium composed of cylindrical cells.

cuboidal epithelium

Epithelium consisting of cube-shaped or prismatic cells with height about equal to their width.

germinal epithelium

1. Epithelium that covers the surface of the genital ridge of the urogenital folds of an embryo. It gives rise to the seminiferous tubules of the testes and the surface layer of the ovary. It was once thought to produce the germ cells (spermatozoa and ova).
2. The epithelium that covers the surface of a mature mammalian ovary.

glandular epithelium

Epithelium consisting of secretory cells.

junctional epithelium

A band of nonkeratinized stratified squamous epithelium that attaches both to the gingiva (on one side) and the crown of the tooth (on the other). Synonym: epithelial attachment; gingival cuff

laminated epithelium

Stratified epithelium.

mesenchymal epithelium

Squamous epithelium that lines the subarachnoid and subdural cavities, the chambers of the eye, and the perilymphatic spaces of the ear.

pavement epithelium

Epithelium consisting of flat, platelike cells in a single layer.

pigmented epithelium

Epithelium containing pigment granules.

pseudostratified epithelium

Epithelium in which the bases of cells rest on the basement membrane but the distal ends of some do not reach the surface. Their nuclei lie at different levels, giving the appearance of stratification.

reduced enamel epithelium

Combined epithelial layers of the enamel organ, which form a protective layer over the enamel crown as it erupts and then become the primary epithelial attachment surrounding the tooth.

squamous epithelium

The flat form of epithelial cells.

stratified epithelium

Epithelium with the cells in layers; mitosis takes place in the lowest layer. Synonym: laminated epithelium

sulcular epithelium

The nonkeratinized epithelium that lines the gingival sulcus.

transitional epithelium

A form of stratified epithelium in which the cuboidal cells adjust to mechanical changes such as stretching and recoiling. This type of tissue is found only in the urinary system (renal pelvis, ureter, bladder, and a part of the urethra).

ep·i·the·li·al

(ep'i-thē'lē-ăl)
Relating to or consisting of epithelium.
References in periodicals archive ?
For example, in the middle of the menstrual cycle when E2 levels are high, women are more likely to experience infections in the lower FRT (viral, bacterial, or fungal) as consequence of reducing the production of AMPs by epithelial cells.
Single nucleotide polymorphisms (SNPs) in IL-31 provide us with an opportunity to investigate potential effects of the factor in the development and progression of epithelial ovarian cancer in humans.
The average duration from the onset to seeking treatment was 5.4 [+ or -] 1.6 days (3.9 [+ or -] 1.3 days for epithelial lesions and 7.9 [+ or -] 2.6 days for stromal necrotic lesions).
Corneal epithelial stem cell deficiency is caused by natural imperfections or injury of the corneal epithelial, the tissue that covers the cornea.
World Health Organization classifies surface epithelial tumors by cell type into serous, mucinous, endometrioid, clear cell, Brenner cell, epithelialstromal and by atypia and invasion into benign, borderline and malignant tumors3.
Maurizio Gualtieri (ENEA, Bologna), with the presentation Air blood barrier and particles: The guardian of a constrained path, showed the in vitro respiratory epithelial barrier and its possible application in toxicology.
The entire epithelial tract and a small cuff of epithelium from the medial and lateral surface of the earlobe is excised, leaving fresh edges of epithelium and dermis for primary closure with dermal 4-0 Vicryl and epidermal 5-0 nylon sutures.
In particular, acquisition of new bacterial strains is assumed to cause acute worsening of patient symptoms.[18] Furthermore, recent studies suggest alterations in the airway microbiome during COPD exacerbations, which are characterized by an increase in airway pathogens.[19] Overall, these observational studies highlight the importance of a better understanding of the role of microbial colonization and infections in COPD pathogenesis and its interaction with epithelial host defenses.
These cysts are seen most frequently in the jaws as odontogenic epithelial rests and have a very close association with the jaw bones.1 In jaws, postodontogenesis proliferation of the epithelial cells of Malassez, the reduced enamel epithelium and cell rests of Serres can give rise to odontogenic cysts.
Other theories suggest the implication of WT1, due to its role in the transformation of mesenchymal cells into epithelial cells [5] and of Beta-catenin and other mesenchymal-epithelial transition factors like: SNAIL, SLUG, TWIST, c-Met, vimentin and E-cadherin.