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Ciliated pseudostratified columnar epithelium is the type of respiratory epithelium found in the linings of the trachea as well as upper respiratory tract, which allows filtering and humidification of incoming air. [1] Non-ciliated pseudostratified columnar epithelia are located in the prostate [2] and membranous part of male vas deferens.
Stratified columnar epithelium is rare but is found in lobar ducts in the salivary glands, the eye, the pharynx, and sex organs. This consists of a layer of cells resting on at least one other layer of epithelial cells, which can be squamous, cuboidal, or columnar. Pseudostratified
Pseudostratified columnar epithelium, animated image highlights the epithelial cells, goblet cells, then underlying connective tissue Cells of the respiratory epithelium. . Basal cells shown in purple, ciliated cells shown in brown, goblet cells shown in green, and submucosal gland shown in bl
Stratified columnar epithelium is initially present in parts of the gastrointestinal tract in utero, before being replaced with other types of epithelium. For example, by 8 weeks, it covers the lining of the stomach. [7] [8] By 17 weeks, it is replaced by simple columnar epithelium. [7] This is also found in the fetal esophagus. [8]
Pseudostratified columnar - reproductive - male: ejaculatory duct: Simple columnar - reproductive - male (gland) bulbourethral glands: Simple columnar - reproductive - male (gland) seminal vesicle: Pseudostratified columnar - respiratory: oropharynx: Stratified squamous, non-keratinized - respiratory: larynx: Pseudostratified columnar, ciliated ...
Their epithelium can be simple cuboidal or simple columnar. [10] Striated ducts are part of the intralobular ducts. They are found in the submandibular gland, [11] [12] sublingual duct, and the parotid gland, but are more developed in the parotid gland. [13] They are not present in pancreas.
One example of pathological irritation is cigarette smoke, which causes the mucus-secreting ciliated pseudostratified columnar respiratory epithelial cells that line the airways to be replaced by stratified squamous epithelium, or a stone in the bile duct that causes the replacement of the secretory columnar epithelium with stratified squamous ...
However, when taller simple columnar epithelial cells are viewed in cross section showing several nuclei appearing at different heights, they can be confused with stratified epithelia. This kind of epithelium is therefore described as pseudostratified columnar epithelium. [5]