- Kansas City University of Medicine and Biosciences
- Histology Cob
- Epithelial Tissues
Last Modified: 2014-09-06
external environment (i.e., surface cells of the epidermis).
I.e., the skin epidermis and glands
I.e., the lining of the gastrointestinal tract (including glands)
I.e., the lining of blood vessels, mesothelium, Bowman’s capsule
Cells are tightly bound together.
Tissues have relatively little intercellular matrix.
Cells exhibit polarity
Epithelial tissues do not contain blood vessels.
Epithelial tissues sit on top of a basement membrane.
Epithelial tissues line body cavities and cover body
Epithelial tissues form secretory and excretory parts of glands.
Epithelial tissues may be innervated.
Simple (one layer) vs. Stratified (more than one layer)
According to the shape of the most superficial layer of cells as seen in a side view:
Squamous (flattened), Cuboidal, Columnar
According to the surface modifications on the apical domains of the outermost cell layer:
Cilia, Stereocilia, Microvilli (brush border)
According to the presence orabsence of keratin
Lightly keratinized in esophagus and vagina
Heavily keratinized in epidermis
Forms walls of alveoli, Bowman’s capsules and inner surfaces ofmembranous labyrinth and tympanic membrane
May have a brush border (kidney tubules) on apical surface composed of microvilli
Found on surface of ovary, pigmented epithelium of retina, kidney tubules,glands and ducts, terminal bronchioles, choroid plexus, and anterior capsule of lens of eye.
Ciliated columnar epithelium is found in the upper respiratory tract,
uterine tubes, uterus, paranasal sinuses, and the central canal of the
Non-ciliated columnar epithelium is found in the digestive tract beginning with the cardia of the stomach, the gall bladder, and in parts of the excretory ducts of glands.
epidermis with connective tissue papillae and in the cornea without
connective tissue papillae.
Lightly or non- keratinized stratified squamous epithelium is found in the esophagus, vagina, lining of the mouth, tongue, and part of the epiglottis.
Pseudostratified epithelium with stereocilia is found in the epididymis.
Stereocilia are similar to microvilli but are longer and are often
Referred to as urothelium
Especially stratified squamous epithelia
-Maintaining Concentration differences
-secretion or absorption
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