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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

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

epithelial

[-thē′lē·əl]
Etymology: Gk, epi, above, thele, nipple
pertaining to or involving the outer layer of the skin.

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.

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
(des´kwəmā´shən),
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
(maləsə´),
n the remnants of Hertwig's epithelial root sheath within the periodontal ligament.

epithelial

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.