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The superficial layer of cells lining the alimentary canal and all its appendages, all glands and their ducts, blood vessels and lymphatics, serous cavities, etc. It often includes the epidermis (i. e., keratin-producing epithelial cells), and it is sometimes restricted to the alimentary canal, the glands and their app…

surrounded by, cilia; as, a ciliate leaf; endowed with vibratory motion; as, the ciliated epithelium of the windpipe.

in columns; having the form of a column or columns; like the shaft of a column. Columnar epithelium (Anat.), epithelium in which the cells are priismatic in form, and set upright on the surface they cover. -- Columnar structure (Geol.), a structure consisting of more or less regular columns, usually six-sided, but so…

The deep layer of mucous membranes beneath the epithelium.

focus the rays of light. It consists of rodlike cells derived from the external embryonic epithelium.

The external layer of the skin and mucous membranes; epithelium; ecderon. -- Ec`ter*on"ic, a.

The thin epithelium lining the blood vessels, lymphatics, and serous cavities. See Epithelium.

Of or pertaining to epithelium; as, epithelial cells; epithelial cancer.

Like epithelium; as, epithelioid cells.

A brown, nitrogenous pigment contained in the retinal epithelium; a variety of melanin.

coloring matter, soluble in ether, contained in the small round fat drops in the retinal epithelium cells. It is best obtained from the eyes of frogs.

Epithelial mesoderm; a layer of cuboidal epithelium cells, formed from a portion of the mesoderm during the differetiation of the germ layers. It constitutes the boundary of the coelum.

A substance, present in the protoplasm of the retinal epithelium cells, and resembling, if not identical with, the substance (myelin) forming the medullary sheaths of nerve fibers.

Having the characteristics of both muscle and epithelium; as, the myoepithelial cells of the hydra.

are more or less complicated sacs, situated in the front part of the head and lined with epithelium innervated by the olfactory (or first cranial) nerves, and sensitive to odoriferous particles conveyed to it in the air or in water.

Having the power to produce a purple color; as, the purpurogenous membrane, or choroidal epithelium, of the eye. See Visual purple, under Visual.

A scale cast off from the skin; a thin dry shred consisting of epithelium.

he outer surface of a Graafian follicle, and to spots of intercellular substance in scaly epithelium, or to minute holes in such spots.

Situated under the epithelium.

ps to make the eye visible in the dark. Sometimes applied to the whole layer of pigmented epithelium of the choroid.