Muscles of mastication & TMJ

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Muscles of mastication & TMJ
2012-03-29 19:27:35
NUPT Head neck mastication

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  1. What are the muscles of mastication
    • masseter
    • temporalis
    • MED pterygoids
    • LAT pterygoids
  2. Innervation of the muscles of mastication?
    Trigeminal nerve CN V
  3. What kind of joint is the TMJ?
    complex biaxial bicondylar joint
  4. What does the mandibular condyle articulate with
    madibular fossa
  5. What direction is the mandibular condyle longer?
    medial lateral direction
  6. What is palpated at the mandibular condyle?
    lateral pole
  7. what covers the articular surface of the condyle
  8. What contains the mandibular fossa
    the temporal bone
  9. Articular eminence location
    anterior to the mandibular fossa
  10. postglenoid tubercle location
    posterior to the mandibular fossa
  11. Articular surface of mandibular fossa location and lining?
    • anterior wall of the fossa (the articular eminence)
    • lined with fibrocartilage
  12. nonarticular surface of the mandibular fossa
    • its the dome and posterior wall of the fossa
    • lined with fibrocartilage
  13. Articular disc function
    • cusion the repetitive muscular forces
    • separates the joint cavity into 2 synovial joint cavities
  14. Articular disc facts
    • made of fibrocartilage
    • attaches to the capsule along with entire periphery of joint
    • sometimes become perforated
  15. Inferior surface of the disc shape
    concave to fit the mandibular condyle
  16. superior surface of disc shape
    convex posteriorly to fit the mandibular fossa and concave anterior to fit the articular eminence
  17. Anterior band of the articular disc qualities
    • thick
    • nonarticular
    • innervated
    • vascular
  18. intermediate band of the articular disc
    • thin
    • articular
    • aneural
    • avascular
  19. Posterior band of articular disc
    • Has a retrodiscal laminae
    • nonarticular
    • innervated
    • highly vascular
  20. retrodiscal laminae
    located posterior to the disc and contains a superior lamine and an inferior retrodiscal laminae
  21. what is the superior retrodiscal laminae composed of?
    rich in elastin
  22. what is the inferior retrodiscal laminae composed of?
    rich in collagen.
  23. Attachments of the disc
    • ANT - joint capsule and upper head of lateral pterygoid
    • MED/LAT to the medial and lateral condylar poles via fibrous bands
    • POST to postglenoid tubercle and back of condyle bia upper and lower layers of bilaminar region
    • circumference to joint capsule
  24. Attachments of the joint capsule
    • superfiorly to articular tubercle, lips of squamotympanic fissure and circumference of mandibular fossa
    • Inferiorly to circumference of mandiular neck
  25. Capsule qualities
    • loose aove the disc and tight below it
    • produces synovial fluid and contains sensory nerveendings.
  26. Lateral temporomandibular ligament
    slope down and back from the tubercle of the zygoma to the lateral surface and POST border of the mandibular neck
  27. sphenomandibular ligament
    • lies medial to and separate from the capsule
    • Attached to spine of the sphenoid and to the lingula of the mandibular foramen

    Some fibers pass through the petrotympanic fissure and form the ANT ligament of the malleus in the middle ear
  28. stylomandibular ligament
    • thickening of deep cervical fascia.
    • Stretches from the styloid process to the angle of the mandible
  29. Blood supply of the TMJ?
    Superficial temporal and maxillary arteries
  30. Innervation to the TMJ
    auriculotemproal and masseteric branches of the mandibular division of the trigeminal nerve