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oral vistible oral cavity proper
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mucous membrane of the oral cavity protection: barrier that protects underlying tissue from abrasion & from exposure to microorganisms & toxic substances sensation: contains receptors for temp, touch, & pain, taste buds secretion: glands in the oral mucosa produce saliva
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histological term that means: epithelium, basal lamina, loose CT called lamina propria also called mucous membrane found in cheeks (buccal), lips (labial), palate (palatine), tongue (lingual)
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| Components of Oral Mucosa |
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most numerous cell epithelial cell with similar cell-cell * cell-extracelluar matrix protiens & adhesion mechanisms as epidermis desmosomes hold keratinocytes together hemidesmosomes attach keratinocytes to the basil lamina
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morphologically similar to epidermal melanocytes produce & secrete melanin a large & diverse group of systemic disease may result in oral pigmentation
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| Nonkeratinized Epithelium |
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| Parakeratinized Epithelium |
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| Orthokeratinized Epithelium |
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similar to skin upper layers consist of anucleate cells filled with thick bundles of keratinprotein more keratinized the surface, generally, the more resistant that area is to physical & chemical trauma
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is a layer of CT underneath the lamina propria some areas of the oral cavity it is attached to muscle (cheeks, lips, tongue) some areas it is attached to bone (palate, alveolar mucosa)
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has nonkeratinized stratified squamous epithelium & protective & nonspecific defense function labial mucosa covers inside of lips buccal mucosa covers cheeks alveolar mucosa covers alveolar bone floor of mouth ventral side of tongue soft palate vestibular mucosa covers tissue between lips or cheeks & gums
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lined with a masticatory mucosa lamina propria is attached to bone of the mandible lots of rete pegs function to hold the epithelium to CT
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junction of dry outer skin & moist inner oral mucosa keratinized epithelium w/deep rete ridges blood vessels in CT come close to the surface to give red color doesn't have glands to provide moisture
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many CT projections covered by a karatinized epithelium lingual papillae mainly on anteriot 2/3 of the tongue filiform papillae fungiform papillae foliate papillae circumvallate papillae
some papillae have taste buds specialized mucosa
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most numerous type of papillae on dorsal surface of anterior 2/3 of tongue shaped like cones that are pointed backwards no taste buds function mainly mechanical may aid in guiding food back to the pharynx for swallowing may function in cleaning the surfaces of the oral cavity &teeth
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mushroom-shaped papillae interspred bewtween filiform some taste buds on surface eoithelium overlying the lamina propria is thin, so blod vessels are close tosurface seen as small red dots on tongue
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parallel rideges on the lateral margins of the posterior part of the tongue oriented at right angles to the long axis of tongue best seen when air from a syringe is directed at them mistaken for tumors or inflammatory diease taste buds are present
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V shape located just anterior to the sulcus terminalis, the junction between the anterior 2/3 & posterior 1/3 of the tongue largest papillae: 3-5mm 100s of taste buds function in taste sensation associated w/all serous secreting minor lingual salivary gland called the serous glands of von Ebner
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| Serous gland of von Ebner |
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serous secreting minor salivary glands associated specifically w/circumvallate papillae cells secrete a watery fluid that washes out the trench surrounding circumvallate papillae & functions as a solvent for food molecules called tastents
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wholly contained w/in epithelium of fungiform, foliate, & circumvallate papillae also located on the epiglottis, soft palate, larynx, & oral pharynx sensory organ receptors for taste
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| Posterior 1/3 of the Tongue |
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no lingual papillae or taste buds lingual minor salivary glands lymphatic tissue present as lingual tonsils in the lamina propria
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