Lip & Tongue
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Lip & Tongue






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Lip & Tongue Presentation Transcript

  • 1. THE DIGESTIVE SYSTEM Dr. Samar Asker
  • 2. The oral cavity represent a common entrance for respiratory &digestive tracts
  • 3. The oral cavity is bounded anterioly by lip, posterioly by pharynx, superioly by palate inferioly by tongue, and laterally by cheeks.
  • 4. The lip The main bulk is formed of bundles of skeletal muscles (orbicularis oris muscle) Arranged in different directions.
  • 5. THE LIP The lip is formed of: a) Outer surface. b) Inner surface. c) Middle layer. d) Red margin.
  • 6. (A) Outer surface: Thin skin Epidermis: keratinized stratified squamous epithelium. Dermis: C.T. rich in hair follicles, sweat glands and sebaceous glands.
  • 7. (B) Inner surface: Lined by Thick, transparent and wet mucous membrane formed of : 1- Epithelium: It is non kretanized stratified squamous & C.T. Corium which contains mucous glands called labial gland which are accessory gland .
  • 8. (D) Red margin: Covered by modified skin which has no hair follicles, no sweat glands & no sebaceous glands. The CT. dermis forms deep papillae that contain numerous blood capillaries & receptors. The skin is thin , transparent & highly sensitive.
  • 9. Red margin Thin skin Skeletal ms. Lipial glands Mucus membrane
  • 10. THE TONGUE
  • 11. A bag of mucous membrane full of sckletal muscle.
  • 12. Macroscopic appearance: formed of dorsal surface & ventral surface •The dorsal surface is rough & adherent mucous membrane divided by V- shaped line called sulcus terminalis into: 1.Posterior1/3: Where lingual tonsil are present. 1.Anterior 2/3: The ventral surface: non adherent mucous membrane
  • 13. (A) Skeletal muscle bundles: • • • • run in vertical, horizontal and longitudinal directions. Covered by stratified squamous epithelium & a CT corium. The ventral surface covered by non keratinized. The CT corium has lingual glands( mucous ) The dorsal surface is covered by partially keratinized & rough due to lingual papillae
  • 14. Lingual papillae: Numerous projections of the mucous membrane on the dorsal surface of the tongue . Each papilla is formed of: Central core of C.T covered with stratified squamous epithelium.
  • 15. Filiform papillae (conical papillae): Site: anterior 2/3 of the dorsum of the tongue Shape: conical Number: most numerous. Taste buds: not present
  • 16. Fungiform papillae: Site: anterior2/3 particularly on the tip and lateral sides scattered between conical papillae. Shape: basal narrow neck and rounded top. Number : less numerous than conical papillae. Taste buds: few.
  • 17. Circumvallate papillae Site: on the Vshaped line. Number: 8 -12 in number (few)
  • 18. Shape: rounded with constricted base which is surrounded by a groove .VonEbner’s glands (serous) underneath this papillae Taste buds: numerous
  • 19. Foliate papillae Site: lateral margin of the dorsal surface the tongue of rabbit. Shape: parallel broad projections of CT covered by epithelium. Number: well developed in rabbit tongue but not in human Taste buds: numerous
  • 20. Filiform Fungiforn Circumvillate Site: Ant 2/3 of At tip & lateral On V shaped dorsal surface sides line Shape: Conical & long .(broad base & pointed tip) No: Numerous Taste Abscent buds: Fungus shape Constricted narrow base & base & broad rounded top top Less in No numerous Lateral margin of dorsal surface of tongue of rabbit Parallel ridges 8-12 in number + ve few Foliata numerous
  • 21. Taste buds Neuroepithelium responsible for taste sensation. Sites: on mucous membranes of: Soft palate. Pharynx. Epiglottis. Professor Kikunae Ikeda
  • 22. • Structure: • It appears as flask shaped bodies scattered among the stratified squamous epithelium covering some lingual papillae • It is formed of an upper opening called gustatory pore & contain 3 types of cells:
  • 23. • • • • • (1) Gustatory cells (haircells) Central in position. Shape: modified columnar. Their free ends show short microvilli Their basal ends surrounded by free nerve endings which carry the taste sensation.
  • 24. • 2) Sustentacular cells: • Peripheral in position & supporting cells • (3) Basal cells: • Basally located & act as stem cells.
  • 25. The free red margin of the lip contains : –Hair follicles. –Sweat glands. –Sebaceous glands. –Numerous receptors.
  • 26. The mucous membrane covering the inner surface of the lip : – Is formed of stratified squamous keratinized epithelium. – Contains sebaceous glands. – Contains sweat glands. – Is thicker than the skin of the outer surface of the lip. – Has no glands.
  • 27. The lip: a.Its inner surface is covered by mucous membrane. b.Its outer surface is covered by thick skin. c.Smooth muscles run in different directions. d.Labial glands are mainly serous.
  • 28. Taste buds are : a.Neuroepithelial structures. b.Formed of 3 types of cells. c.Situated between the cells of stratified squamous epithelium. d.In contact with fine nerve fibres that carry taste sensations. e.All of the above. •
  • 29. The skin covering the outer surface of the lip : a.Contains no hair follicles or sebaceous glands. b.Contains no sweat glands. c.Is thicker than the inner surface of the lip. d.All of the above. e.None of the above.