Covers the general role of covering epithelium, then the stratified types classed by the shape of their surface cells: squamous (keratinised and non-keratinised subtypes), cuboidal, and columnar, each with its location and function. Transitional epithelium (urothelium) is described with its umbrella cells and distension role. A summary table lists the types with their locations and functions.
Topic 38 of 127 in the MU Sofia syllabus for Cytology (Dental Medicine, Year 1). The free AceMed note covers it in 7 sections, about 307 words (3 min of reading), with 13 flashcards.
In this note
Covering Epithelium
Stratified Epithelia
Stratified Squamous Epithelium
Stratified Cuboidal Epithelium
Stratified Columnar Epithelium
Transitional Epithelium (Urothelium)
Summary Table
Covering Epithelium
Covering epithelia form cellular sheets that line the cavities of organs and cover the body surface. All substances that enter or leave tissues and organs must cross an epithelium.
Locations: Covering epithelium is found on the external and internal surfaces of the body. It forms the outer layer of the skin (epidermis) and lines various cavities and tubes within the body, such as the digestive and respiratory tracts.
Functions:
Protection: Covering epithelium acts as a protective barrier against physical damage, pathogens, and dehydration.
Selective Permeability: Depending on the location, covering epithelium can regulate the passage of substances into and out of tissues.
Sensation: Some covering epithelium, especially in sensory organs, detects stimuli, such as touch, pressure, and temperature.
Secretion: Certain types of covering epithelium can secrete substances, such as mucus in the respiratory tract or enzymes in the digestive tract.
Stratified Epithelia
Stratified epithelia are classified according to the cell shape of the superficial layer(s): squamous, cuboidal, or columnar.
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