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 ?
Histopathological examination of the cyst showed a benign cyst lined with a mucinous columnar epithelium.
Based on World Heath Organization (WHO) criteria, MCNs are defined as cystic epitheilal neoplasms composed of mucin producing columnar epithelium and an ovarian-type stroma which forms a band of densely packed stromal cells beneath the epithelium.
Bronchoscopy will often reveal a transformation of tissue from normal columnar epithelium into squamous epithelium, even when the reflux is nonacidic, but beyond that, finding the proper context for tissue changes such as cobblestoning and ruling out non-LPR origins can be a challenge.
Cysts were lined by a tall columnar epithelium, which in some areas was pseudostratified, or by low cuboidal to flattened cells (Fig 10).
Simple columnar epithelium forms the linings of the digestive tract as well as other tubular organs such as the uterus and cranial vagina.
Like the cervix, the anal canal has a transformation zone in which the columnar epithelium of the rectum joins the squamous epithelium of the anus.
On microscopic examination, the loculated cyst was found to be lined by cuboidal columnar epithelium merging with areas of thin squamous epithelium, and in one area there was a well-established invasive adenocarcinoma.
Female adolescents are biologically at higher risk for STDs such as chlamydia and gonorrhea because of the columnar epithelium on their ectocervix, said Dr.
Columnar epithelium in both the trachea and bronchiole was intact, thus providing adequate columnar epithelial cells for evaluation.
Covering the tentacle is a simple columnar epithelium lying on a thick basement membrane (Figs.