Temperomandibular joint


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tmj its articular contents, ligaments, relations, blood supply and nerve supply

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Temperomandibular joint

  2. 2. Introduction  Synovial joint of the condylar variety.  Formed by head of the condyle and glenoid fossa of the temporal bone  Glynglimoarthroidal joint – sliding hinge joint
  3. 3. The components of tm joint  Articular surface  Articular disc  ligaments
  4. 4. Articular surface 1 Upper articular surface (formed by parts of temporal bone) articular eminence Anterior part of mandibular fossa 2. Inferior articular surface formed by the head of the mandible 3.Articular surface is covered by fibrocartilage
  5. 5. Articular disc  Oval fibrous plate  Divides the joint cavity into an upper and a lower compartment  Upper compartment- gliding movement  Lower compartment- rotatory as well as gliding movements  Periphery is attached to the fibrous capsule
  6. 6. Ligaments
  7. 7. Fibrous capsule It is attached  above to the articular tubercle, the cicumference of the mandibular fossa and the squamotympanic fissure  Below to the neck of mandible  The capsule is loose above the intra articular disc and tight below it  Synovial membrane lines the fibrous capsule and the neck of mandible
  8. 8. Lateral (tmj) ligament  Reinforces and strengthens the lateral part of the capsular ligament  Fibers directed downwards and backwards  Attached above to the articular tubercle  Below to the posterolateral aspect of the neck of the mandible
  9. 9. Sphenomandibular ligament  Acessory ligament ,lies on a deep plan away from the fibrous capsule  Attached superiorly to the spine of the sphenoid  And inferiorly to the lingula of the mandibular foramen  Remant of the dorsal part of meckel’s cartilage
  10. 10. The ligament is related laterally to  The lateral pterygoid  The auriculotemporal nerve  The maxillary artery  Inferio alvelar nerves and vessels Related medially to  The meial pterygoid  The chorda tympani nerve  The wall of the pharynx Pierced by mylohyoid nerves and vessels near its lower end
  11. 11. Stylomandibular ligament  Accessory ligament of the joint  Represents a thickened part of the deep cervical fascia which separates the parotid and submandibular salivary glands  Attached above to the lateral surface of the styloid process  Below to the angle and posterior border of the ramus of the mandible
  12. 12. Relations of temporomandibular joint Lateral a. skin and fasciae b. parotid gland c. temporal branches of the facial nerve Medial a. the tympanic plate separates the joint from the internal carotid artery b. spine of the sphenoid c. the auriculotemporal and chorda tympani nerves d. midle meningeal artery
  13. 13.  Anterior A. lateral pterygoid B. massetric nerves and vessels  Posterior a. the parotid gland separates the joint from the external auditory meatus b. superficial temporal vessels c. auriculotemporal nerve  Superior a. middle cranial fossa b. middle meningeal vessels Inferior a. maxillary artery and vein
  14. 14. Blood supply Branches from superficial temporal and maxillary arteries Nerve supply a. auriculotemporal nerve b. masseteric nerve
  15. 15. THANK YOU