Tulang Rahang & TMJ

 

• Temporomandibular Joint

  Synovial joint=joint within a joint capsule that moves freely

  Anterior to the ear and at the posterior superior end of the jaw

  • Lips closed
  • Teeth several millimeters apart
  • Tongue just behind front teeth
  • Condyle in mandibular fossa

  Gerakan pada sendi ini dibagi dua:

  • Gerakan hinging (engsel) oleh sendi ginglymoid
  • Gerakan meluncur oleh sendi arthrodial

  TMJ dibentuk oleh kondilus mandibularis (mandibula) melekat pada fossa mandibula (temporal) dan 2 tulang yang dipisahkan oleh discus artikularis.

• Kavitas

• Komponen Aktif

• Komponen Pasif

  • Condyle Mandibula

    • capitulum mandibulae
    • collum mandibulae

  • Mandibularfossa/ meniscus

  • Articulare Disc→

    Fibrous disc between temporal bone and condyle acting like a condyle capDivides compartments (upper/lower)

    Deformable pad so forces are distributed for protection fo articular surfaces

  • Capsula Articularis

  • Retrodiscal tissue

    Loose connective tissue between the bilaminar zone that is rich in blood supply, nerves, and compressible

  • Ligament

  Joins the mandible to cranium3 paired ligaments, *Act as passive restraining device to limit and restrict movements of the condyle and disc.

  • Temporomandibular ligament

    → lateral of the capsule, Prevents mandibular retraction

    *Outer oblique (Resists mouth dropping)

    *Inner horizontal(prevents posterior movement of condyle into glenoid fossa)

  • Sphenomandibular ligament

    *Medial to TMJ

    *Runs from sphenoid spine to lingula of mandible

    *Separates parotid from submandibular

    *Landmark for admin of inferior alveolar block

  • Stylomandibular ligament

    • Posterior aspect/angle mandible

    *Originates from styloid process (Temporal bone)

    *Inserts in the angle of the mandible

    =Both become accentuated and taut when mandible is protruded

    *Collateral ligaments → articular disc

• Sensory innervation

  (Mandibular nerve (CN V3)) percabangan trigeminal nerve

  Branches of ECA

  • Maxillary

  • Superficial temporal

• Posterior Blood supply of TMJ

  *Superficial temporal artery

• Anterior Blood supply of TMJ

  *Middle meningeal artery

• Inferior Blood supply of TMJ

  (Internal maxillary artery

• Other blood supply to the TMJ

  Deep auricularAnterior tympanic*Ascending pharyngeal

  Blood Supply of the TMJ photo

  Superficial temporal vein

  Maxillary vein

  Pterygoid plexus of veins