columnar epithelium


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epithelium

 [ep″ĭ-the´le-um] (pl. epithe´lia) (Gr.)
the cellular covering of internal and external surfaces of the body, including the lining of vessels and other small cavities. It consists of cells joined by small amounts of cementing substances. Epithelium is classified into types on the basis of the number of layers deep and the shape of the superficial cells.
ciliated epithelium epithelium bearing vibratile, hairlike processes (cilia) on its free surface.
columnar epithelium epithelium whose cells are of much greater height than width.
cuboidal epithelium epithelium whose cells are of approximately the same height and width, and appear square in transverse section.
germinal epithelium thickened peritoneal epithelium covering the gonad from earliest development; formerly thought to give rise to germ cells.
glandular epithelium that composed of secreting cells.
pigmentary epithelium (pigmented epithelium) that made of cells containing granules of pigment.
sense epithelium (sensory epithelium) neuroepithelium (def. 1).
simple epithelium that composed of a single layer of cells.
squamous epithelium that composed of flattened platelike cells.
stratified epithelium epithelium made up of cells arranged in layers.
transitional epithelium a type characteristically found lining hollow organs, such as the urinary bladder, that are subject to great mechanical change due to contraction and distention; originally thought to represent a transition between stratified squamous and columnar epithelium.

co·lum·nar ep·i·the·li·um

epithelium formed of a single layer of prismatic cells taller than they are wide.

columnar epithelium

n.
Epithelium consisting of one or more cell layers, the most superficial of which is composed of elongated and somewhat cylindrical cells projecting toward the surface.

columnar epithelium

Etymology: L, columna, column; Gk, epi, upon, thele, nipple
a type of epithelial cell that resembles a hexagonal prism.

co·lum·nar ep·i·the·li·um

(kō-lŭm'năr ep'i-thē'lē-ŭm)
Epithelium formed of a single layer of prismatic cells taller than they are wide.

columnar epithelium

see EPITHELIUM.
References in periodicals archive ?
Barrett esophagus is due to GERD and the replacement of squamous epithelium with a specialized columnar epithelium.
In cross sections the basic structure of the cephalic tentacle is similar to that of other species of Haliotis because the tentacular nerve is in the middle of longitudinally orientated muscle fibers, and it is covered by a simple columnar epithelium (Croft 1929, Bevelander 1988, Beesley et al.
Salivary duct cysts occur typically in close association with salivary gland tissue and possess partial or complete epithelial lining (thus distinguishing them from mucous extravasation cysts) ranging from 1 or 2 layers of flat to cuboidal epithelial cells, occasionally containing oncocyte-like cells, to thicker pseudostratified columnar epithelium or stratified squamous epithelium.
The columnar epithelium stains with periodic acid Schiff in most cases and with Alcian blue in about 66% of cases.
Pseudostratified columnar epithelium was identified in 11 patients (61.
Histopathologically, the cyst walls are lined with columnar epithelium.
Thus, by inference, this definition suggests that metaplastic, non-goblet cell columnar epithelium in the esophagus is not premalignant.
Nests of squamous epithelium with prominent cytoplasmic clearing in addition to loci of malignant columnar epithelium consistent with an adenocarcinoma were also identified (figure 3, B).
By comparison, in the United Kingdom, the presence of goblet cells is not a requirement, so long as columnar epithelium is present and the biopsy is obtained from the tubular esophagus, above the gastroesophageal junction.
In Figure 1, A, LGD is present in the crypts; the mucosal surface, however, is lined by nondysplastic columnar epithelium.
Furthermore, more than one-third of the pathologists inaccurately labeled gastric metaplasia without specialized columnar epithelium as Barrett's esophagus (Gastrointest, Endosc.
Two centimeters inside the anal canal is a transformation zone where the rectal columnar epithelium meets the anal squamous epithelium.