epithelium /ep·i·the·li·um/ (-the´le-um) pl. epithe´lia [Gr.] the cellular covering of internal and external body surfaces, including the lining of vessels and small cavities. It consists of cells joined by small amounts of cementing substances and is classified according to the number of layers and the shape of the cells.
glandular epithelium
ciliated epithelium that bearing vibratile cilia on the free surface.
columnar epithelium that composed of columnar cells.
cuboidal epithelium that composed of cuboidal cells.
glandular epithelium that composed of secreting cells.
olfactory epithelium pseudostratified epithelium lining the olfactory region of the nasal cavity and containing the receptors for the sense of smell. 
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Schematic diagram of the receptors in the olfactory epithelium.
pseudostratified epithelium a type that looks stratified but is not, because its cells are arranged with their nuclei at different levels.
seminiferous epithelium stratified epithelium lining the seminiferous tubules of the testis.
simple epithelium that composed of a single layer of cells.
squamous epithelium that composed of squamous cells.
stratified epithelium that composed of cells arranged in layers.
transitional epithelium that characteristically found lining hollow organs that are subject to great mechanical change due to contraction and distention; originally thought to represent a transition between stratified squamous and columnar epithelium.
| glandular epithelium n. Epithelium made up of cells that produce secretions. |
glandular epithelium
Etymology: L, glandula, small gland; Gk, epi, above, thele, nipple
epithelium that contains glandular cells.
epithelium
pl. epithelia [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. Standard classifications include ciliated (cilia attached), columnar (taller than wide), cuboidal (same height as width), pseudostratified (single layer but because of varying cell height appears to be more than one), simple (one cell layer), squamous (flattened, plate-like cells), stratified (more than one layer), transitional (variable number of layers apparent). Other types are listed below.
anterior epithelium
the thin layer of stratified squamous cells that form the outermost layer of the cornea.
corneal epithelium
see anterior epithelium (above).
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.
lens epithelium
cuboidal epithelium covering the lens.
pigmentary epithelium, pigmented epithelium
that made of cells containing granules of pigment.
posterior epithelium
the single layer of epithelial cells on the back of the cornea, between stroma and aqueous humour; the corneal endothelium.
retinal pigment epithelium
see retina.
sense epithelium, sensory epithelium
see neuroepithelium (1).
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