Epithelium

Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of structures throughout the body, and also form many glands. Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport and detection of sensation. In Greek "epi" means, "on, upon," and "thele" meaning "nipple". Epithelial layers are avascular, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane. Epithelia can also be organized into clusters of cells that function as exocrine and endocrine glands. Exocrine and endocrine epithelial cells are highly vascular.

Read more about Epithelium:  Structure, Classification, Functions, Embryological Development, Growing in Culture, Location, Additional Images

Other articles related to "epithelium":

TROL - Deficiency
... (xerosis) as the normal lacrimal and mucus-secreting epithelium is replaced by a keratinized epithelium ... lumps at hair follicles), keratosis pilaris and squamous metaplasia of the epithelium lining the upper respiratory passages and urinary bladder to a ...
Cervical Ectropion - Formation
... junction, where the columnar secretory epithelium of the endocervical canal meets the stratified squamous covering of the ectocervix, is located at the external os before ... estrogen levels rise during puberty, the cervical os opens, exposing the endocervical columnar epithelium onto the ectocervix ... through a process of squamous metaplasia, transforms into stratified squamous epithelium ...
Columnar
... Columnar epithelium may be simple or stratified ... Simple columnar epithelium is most common and involves one layer of cells attached to a basement membrane ... Stratified columnar epithelium is rare but can be found in salivary glands ...
Epithelium - Additional Images
... Squamous Epithelium 100x Human cheek cells (Nonkeratinized stratified squamous epithelium) 500x ...
Coelomic Epithelium
... Coelomic epithelium refers to the epithelium that lines the surface of the body wall and abdominal organs ... It constitutes the outermost layer of the male and female gonads, thus forming the germinal epithelium of the female or of the male ... It is also called the germinal epithelium of Waldeyer or sometimes the superficial epithelial cells in embryology ...