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Related to epithelial: Epithelial cells


pertaining to or composed of epithelium.


Relating to or consisting of epithelium.


/ep·i·the·li·al/ (-the´le-al) pertaining to or composed of epithelium.


Etymology: Gk, epi, above, thele, nipple
pertaining to or involving the outer layer of the skin.


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


Relating to or consisting of epithelium.


(ep?i-the'le-um) ('le-a) plural.epithelia [ epi- + Gr. thele, nipple, teat + -ium (2)]
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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).


Relating to or consisting of epithelium.

epithelial (ep´ithē´lēəl),

adj pertaining to the epithelium.
epithelial attachment (EA),
epithelial cells,
n.pl cells that form the epithelial tissue that lines both the inner and outer surfaces of the body; serve a protective function and also aid in absorption and secretion.
epithelial cuff, attached,
n the band of gingival tissue that is located around the tooth's margin.
epithelial cuff, implant,
n the band of tissue that is constricted around an implant abutment post.
epithelial desquamation, anesthetic
n the ulceration and shedding of oral epithelial tissue that occurs as the result of prolonged exposure to topical anesthesia.
epithelial inclusion,
n the bits of epithelial tissue introduced into bone crypts during perforation osteotomies. See also osteotomy, perforation.
epithelial layers,
n the number and type of layers present in epithelium.
epithelial rests of Malassez
n the remnants of Hertwig's epithelial root sheath within the periodontal ligament.


pertaining to or composed of epithelium.

epithelial root sheath
a fold of gingival epithelium which grows down into the dental alveolus and surrounds the tooth root.
epithelial tissue
a general name for tissues not derived from the mesoderm.
References in periodicals archive ?
Microscopically, the neoplasm is biphasic with both epithelial and spindle cell elements.
Overall the authors concluded the RGE may improve viability of human epithelial cells, supress inflammatory responses in lung alveolar epithelial cells and may interfere with oxidative stress events upon H1N1 influenza A virus infection.
subtilis may influence the expression of TJ proteins in porcine epithelial cells that could attribute to a protective effect against DON-induced damage.
Focal epithelial hyperplasia, or Heck's disease, is a rare, viral-induced proliferation of oral squamous epithelium.
In the Xu study, the team's protocol succeeded in turning over 25 per cent of the iPSCs into epithelial stem cells in 18 days.
Herpetic epithelial viral keratitis presents classically as a dendritic ulcer but may vary in severity from punctate corneal staining to a large geographic ulcer.
With these concern, this study aims to assess the epithelial micronuclei occurrence among the school children and compare whether differences exist among the school children based on their socio-demographic and location on the occurrence of buccal epithelial micronuclei.
Microscopically, the tumors contained variable proportions of epithelial and mesenchymal elements with an infiltrative growth pattern.
Since the corneal epithelium is of the stratified squamous type, autologous epithelial cells such as oral, conjunctival, nasal and oesophageal epithelia, all having a similar morphology, could be considered as an alternative to allogenous limbal transplants.
Pathology revealed 127 cases of epithelial ovarian cancer, 22 low-malignant-potential (LMP) tumors, 6 nonepithelial ovarian cancers, and 21 nonovarian cancers in the group as a whole.
Our studies were designed to investigate the effect of alpha-lipoic acid (ALA), a naturally occurring antioxidant, on a key inflammatory signaling pathway and cell proliferation in normal and tumorigenic ovarian surface epithelial cells.
l) In addition, the erosion might also be partly related to the accumulation of keratin debris, which traps moisture and results in a bacterial infection that can cause ulceration of the epithelial layer and the formation of granulation tissue.