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Development and anatomy of temporomandibular joint


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Development and anatomy of temporomandibular joint

  1. 1. Dr Wajiha Qamar
  2. 2.  Joint of Jaw 2 TMJ’s working in union Formed by Mandibular fossa and articular Tubercle of temporal bone Condyl of mandible
  3. 3.  GinglymoArthroidal joint Condyl articulates with temporal bone in the mandibular fossa Synovial joint enclosing synovial fluid Develops in 12th week of intra uterine life
  4. 4.  Mandibular condyls Articular surfaces of Temporal bone Capsule Articular disc Ligaments
  5. 5.  Fibrous membrane that surrounds the joint Covers the joint from all around Thin above the disc and thick below it
  6. 6.  Fibro cartilaginous tissues Disc divides the compartment into 2 Upper formed by Temporal bone and articular disc (Menisco temporal) Lower formed by mandible and articular disc(Menisco mandibular)
  7. 7.  Major Ligament  Temporomandibular ligament  Capsular ligament Minor Ligaments  Stylo mandibular ligament  Spheno mandibular ligament
  8. 8.  Other Ligaments Oto mandibular ligament Disco malleolar ligament Mallelo mandibular ligament
  9. 9.  Messeter Temporalis Medial pterygoid Lateral pterygoid
  10. 10.  SENSORY Auriculo temporal nerve Messeteric nerve MOTOR Mandibular division of trigeminal nerve
  11. 11.  Branches of External Carotid Artery Superficial temporal artery Deep auricular artery Anterior tympanic artery Ascending pharyngeal artery Maxillary artery
  12. 12.  The Blood supply to TMJ is only Superficial, i.e there is no blood supply inside the capsule TMJ takes its nourishment from Synovial fluid
  13. 13.  4 RECEPTORS  Ruffini receptors Pacinion receptors Golgi tendon organs Free nerve endings
  14. 14.  Ruffini Endings Position the mandible Pacinion Receptors Accelerate movement during Reflexes Golgi tendon Organs Protection of ligaments Around TMJ Free Nerve Endings Pain receptors
  15. 15.  Anteriorly  Mandibular notch  Messeteric nerve and artery Posteriorly  Tympanic plate  Glenoid process of parotid gland Laterally  Parotidgland  Skin and fascia Medially  Maxillary artery and vein
  16. 16.  Rotational movement in first 20-25mm of mouth opening Translational movement after that when the mouth is excessively opened
  17. 17. 1. Depression Of MandibleLateral pterygoidDigrastricGeniohyoid2. Elevation of Mandible Temporalis Masseter Medial Pterygoids
  18. 18. 3. Protrusion of Mandible LateralPterygoids Medial Pterygoids4. Retraction of Mandible Posterior fibres of Temporalis