Anatomy & Physiology ; Epithelial Tissue

Simple Squamous Epithelium
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Terms in this set (8)
- Description: Single layer of tall cells with round to oval nuclei and microvilli to increase surface area; some cells bear cilia; layer may contain mucus-secreting unicellular glands (goblet cells)

- Function: Absorption; secretion of mucus, enzymes, and other substances; ciliated type propels mucus (or reproductive cells) by ciliary action

Location: Non-ciliated type lines most of the digestive tract (Stomach to rectum), gallbladder, and excretory ducts of some glands; Ciliated variety lines small bronchi, uterine tubes and some regions of the uterus.
Image: Simple Columnar Epithelium
- Description: Single later of cells of different heights, some not reaching the free surface; nuclei seen at different levels; may contain mucus-secreting goblet cells and bear cilia

- Function: Secretion, particularly of mucus; propulsion of mucus by ciliary action

Location: non-ciliated type in male's sperm-carrying ducts and ducts of large glands; variety lines the trachea, most of the upper respiratory tract.
Image: Pseudostratified columnar epithelium
Description: Thick membrane composed of several cell layers; basal cells are cuboidal or columnar and metabolically active; surface cells are flattened (squamous); in the keratinized type, the surface cells are full of keratin and dead; basal cells are active in mitosis and produce the cells of the more superficial layers

- Function: Protects underlying tissues in areas subjected to abrasion

Location: Nonkeratinized type forms the moist linings of the esophagus, mouth, and vagina; keratinized variety forms the epidermis of the skin, a dry membrane.
Image: Stratified squamous epithelium
-Description: resembles both stratified squamous and stratified cuboidal; basal cells cuboidal or columnar, surface cells dome shaped or squamous-like, depending on degree of organ stretch.

-Function: Stretches readily, permits stored urine to distend urinary organ

-Location: lines the ureters, bladder, and part of the urethra
Image: Transitional epithelium