TMJ and Mandible Anatomy Quiz
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Questions and Answers

Which muscle is primarily responsible for elevating the mandible for closure?

  • Temporalis
  • Masseter (correct)
  • Medial Pterygoid
  • Lateral Pterygoid

    • The lateral pterygoid muscle assists in jaw closure and retraction.

    False (B)

    What is the function of the sphenomandibular ligament?

    Limits lateral movements of the mandible.

    The _____ dislocation involves the condyloid process moving beyond the articular tubercle.

    <p>anterior</p> Signup and view all the answers

    Match the following muscles of mastication with their descriptions:

    <p>Masseter = Elevates the mandible Temporalis = Assists in jaw closure and retraction Medial Pterygoid = Two heads, attaches to maxilla and palate Lateral Pterygoid = Two heads, assists in jaw depression</p> Signup and view all the answers

    Which bone articulates with the condyloid process in the TMJ?

    <p>Temporal (A)</p> Signup and view all the answers

    The articular disc of the TMJ allows both gliding and rotational movements.

    <p>True (A)</p> Signup and view all the answers

    What structure limits the posterior movement of the mandible?

    <p>Lateral ligament</p> Signup and view all the answers

    The joint type of TMJ is a ______ joint.

    <p>synovial</p> Signup and view all the answers

    What happens during jaw depression in the TMJ?

    <p>Anterior movement of the condyloid process (C)</p> Signup and view all the answers

    Match the following parts of the mandible with their descriptions:

    <p>Condyloid process = Articulates with the TMJ Coronoid process = Attachment for muscles Mental foramina = Sensory innervation entry point Mandibular foramina = Entry of inferior alveolar nerve</p> Signup and view all the answers

    Dislocation of the TMJ occurs when the condyloid process moves backward beyond the articular tubercle.

    <p>False (B)</p> Signup and view all the answers

    What anatomical landmark is also known as the articular eminence?

    <p>Articular tubercle</p> Signup and view all the answers

    Study Notes

    Temporomandibular Joint (TMJ)

    • The TMJ is a synovial joint
    • Articulation between the condyloid process of the mandible and the mandibular fossa of the temporal bone
    • The articular disc divides the joint into upper and lower compartments
    • Upper compartment allows gliding movements (protrusion, retraction)
    • Lower compartment allows rotational movements (elevation, depression)
    • The condyloid process can dislocate if it moves beyond the articular tubercle

    Mandible

    • Consists of:
      • Condyloid process
      • Coronoid process
      • Mandibular notch
    • Superior processes separated by the mandibular notch
    • Other parts: Neck, ramus, angle, body
    • Foramina: Mental foramina (sensory innervation by mental nerves), internal aspects (mandibular foramina, submandibular fossa)

    Bones

    • Temporal bone
    • Sphenoid bone
    • Zygomatic bone
    • Maxilla
    • Mandible

    Muscles of Mastication

    • Muscles that move the jaw
    • Masseter: Two heads (superficial and deep). Elevates mandible.
    • Temporalis: Fan-shaped, arises from temporal fossa, assists in jaw closure and retraction.
    • Medial pterygoid: Two heads (deep).
    • Lateral pterygoid: Two heads (superior, inferior). Assists in jaw movements.

    Ligaments

    • TMJ ligaments limit jaw movements
    • Lateral ligament limits posterior movements
    • Medial ligaments (sphenomandibular ligament) limits movements
    • Stylomandibular ligament limits lateral movements

    Jaw Dislocation

    • Can occur when the condyloid process moves beyond the articular tubercle
    • Typically involves the anterior dislocation of the condyloid process
    • Resolution involves applying downward pressure on molars and guiding mandible back into the mandibular fossa

    Innervation

    • All muscles of mastication are innervated by the mandibular branch of the trigeminal nerve.

    Jaw Function

    • The joint is most stable when the jaw is closed
    • Summary of motions: gliding and rotational movement in the two compartments of the TMJ.

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    Related Documents

    TMJ Anatomy and Dislocation PDF

    Description

    Test your knowledge on the anatomy of the temporomandibular joint (TMJ) and mandible. This quiz covers the structure, function, and associated muscles of mastication. Understand the key elements including joint compartments and movements.

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