Oral Cavity

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By: Dr. Pamela Fabie

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Oral Cavity

  1. 1. These are two fleshy folds that circumscribe the mouthand closes the cavity. At the sides they unite to form the oralcommisures5 LAYERS1. Skin – contains hair follicles and sebaceous glands2. Superficial Fascia- contains some fats3. Orbicularis Oris muscle – serves as sphincter of the mouth4. Submucous tissue – contains vessels, mucous labial glandsand labial branches of facial artery5. Mucous membrane – innermost layer
  2. 2. Oral CavityProperOral Vestibule
  3. 3. Boundaries:1. Anteriorly by lips2. Laterally by cheeks3. Posteriorly andmedially by teeth andgums
  4. 4. Boundaries:1. Anteriorly laterallyby teeth and gums2. Superiorly by thepalate3. Inferiorly by thetongue and thefloor of the mouth4. Posteriorly byopening into thepharynx
  5. 5. Lingual frenulum(connects thetongue to the floorof the mouth)Papillae ( openingsof submandibularduct)Sublingual fold(passes lateraly andbackwards from thepapilla and overliesthe sublingualgland)Each sublingual compartment contains submandibulargland and dcuts, lingual and hypoglossal nerve and thesiblingul vessels.
  6. 6.  Smallest salivary gland Indicated by the sublingualfold, found between thealveolus and anteiror part ofthe tongue Lesser sublingual duct(Rivini’s ducts) – opens intothe floor of the mouth Greater sublingual duct(Bartholin’s ducts) opens onthe sublingual caruncle
  7. 7.  Located at thesubmandibular fossa belowmylohyoid muscle. Submandibular duct(Wharton’s ducts) – opens atthe sublingual papillae
  8. 8.  Consists of dense vascular fibrous tissue which is coveredby mucuos membrane and attached to the alveolarmargins of the jaws.
  9. 9. o Covered by mucousmembrne and forms apartition between the oraland the nasal cavityo The mucous membraneand the periosteumcannot be separated(mucoperiosteum)Medianraphe
  10. 10. Movable portion and is attached to the hard palatePalatine tonsil is also called “Isthmus of Fauces” or the TonsilarSinus
  11. 11.  Levator Palatini – brings softpalate in contact withposterior pharyngealwall, preventing food fromgoing upward ino thenasopharynx Tensor Palatini – tenses thesoft palate Palatoglossus – raises thetongue Uvulae muscle – raises theuvula
  12. 12.  Mobile mass of muscleslying on the floor of themouth and associatedwith functions oftaste, chweing, swallowingand speaking
  13. 13. PAPILLAE OF THETONGUETASTE DISTRIBUTION
  14. 14. a. Extrinsic muscles responsible for changingthe position of the tonguea. Gionioglossusb. Geniohyoidb. Intrinisic muscles change the shape of thetonguea. Superior longitudinalmusclesb. Inferior longitudinalmusclesc. Transverse muslced. Vertical muscles

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