Epithelial Tissue
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| How to name epithelial tissue | When investigating epithelia, locate the apical and basal surfaces:
- The cell type at the apical surface names the epithelium
- The number of layers between the apical and basal surfaces names the epithelium
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| Simple Squamous Function | allows materials to pass by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae
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| Simple Squamous Location | Kidney glomeruli; air sacs of the lungs; lining of heart, blood vessels and lymphatic vessels; lining of ventral body cavity (serosae)
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| simple cuboidal function | secretion and absorption
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| Simple cuboidal location | Kidney tubules; ducts and secretory portions of small glands; ovary surface
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| Simple Columnar function | absorption; secretion of mucus, enzymes, and other substances; ciliated type propels mucus (or reproductive cells) by ciliary action
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| Simple Columnar Location | Nonciliated type lines most of the digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands; ciliated variety lines small bronchi, uterine tubes, and some regions of the uterus
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| pseudostratified columnar function | secrete substances, particularly mucus; propulsion of mucus by ciliary action
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| Pseudostratified columnar location | nonciliated type in male's sperm-carrying ducts and ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract
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| Stratified squamous function | protects underlying tissues in areas subjected to abrasion
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| Stratified squamous location | nonkeratinized type forms the moist linings of the esophagus, mouth, and vagina; keratinized variety forms the epidermis of the skin, a dry membrane
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| Stratified cuboidal function | Protection
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| Stratified cuboidal location | Largest ducts of sweat glands, mammary glands, and salivary glands
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| transitional epithelium function | stretches readily, permits stored urine to distend urinary organ.
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| transitional epithelium location | lines the ureters, bladder, and part of the urethra
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| Stratified columnar function | protection
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| Stratified Columnar locations | male urethra, pharynx, epiglottis, anus, mammary glands, salivary glands
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