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  1. How many times do the TMJ contract in one day?
  2. What type of joint is the TMJ?
    Synovial, modified hinge joint.
  3. Muscles responsible for the depression of the mandible.
    • Digastric, Geniohyoid, Mylohyoid
    • Lateral Pterygoid - for pulling forward the neck
  4. Muscle(s) responsible for the elevationĀ of the mandible.
    Temporalis, Medial Pterygoid, Masseter
  5. What muscle pulls backward the head of the mandible during elevation?
    Posterior fibers of Temporalis
  6. What pulls backward the articular disc during the elevationĀ of mandible?
    Fibroelastic Tissue
  7. In which cavity does the depression/elevation of the mandible occurs?
    Lower cavity of the joint
  8. In which cavity does the protrusion of the mandible occurs?
    Upper cavity
  9. Muscle(s) responsible for the protrusion of the mandible.
    Lateral and Medial Pterygoids
  10. Muscle(s) responsible for the retraction of the mandible?
    Posterior fibers of Temporalis
  11. Muscle responsible for the lateral chewing movements of mandible.
    Lateral pterygoid
  12. Surrounds the joint; from the root of the articular tubercle and mandibular fossa to the neck of mandible
    Joint Capsule
  13. Attachments of Lateral Temporomandibular Ligament.
    • Tubercle on the root of the zygoma
    • Lateral surface of the neck of mandible
  14. Functions of Lateral Temporomandibular Ligament.
    • 1. Strengthens the lateral aspect of the mandible
    • 2. Prevents excessive posterior movement of the mandible
    • 3. Protects the external auditory meatus
  15. Attachments of Sphenomandibular Ligament.
    • Spine of the Sphenoid
    • Lingula of Mandible
  16. Functions of Sphenomandibular Ligament.
    • 1. Point of rotation when the lateral pterygoid is activated
    • 2. Helps in the translation of mandible
  17. Attachments of Stylomandibular Ligament.
    • Styloid Process
    • Angle of Mandible
  18. Function(s) of the Stylomandibular Ligament.
    • Point of rotation.
    • Prevents excessive protrusion of mandible.
  19. Divides the joint into upper and lower cavities; surrounded by synovial membrane
    Articular Disc
  20. Nerve supply of TMJ
    Auriculotemporal and masseteric branches of mandibular nerve.
  21. Relations of TMJ

    • Anterior: Mandibular Notch, Masseteric Nerve & Artery
    • Posterior: Tympanic Plate of External Auditory Meatus, Glenoid process of parotid gland
    • Lateral: Parotid Gland, fascia, skin
    • Medial: Maxillary artery & vein, Auriculotemporal Nerve
  22. Mouth slightly opened so teeth are not in contact
    Loose packed / resting position
  23. Teeth clenched and heads of the condyles in the posterior aspect of the joint
    Closed packed
  24. Occurs with maximum contact of teeth and it is the position of the jaw when swallowing
    Centric occlusion
Card Set:
2014-08-31 06:00:56


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