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Questions and Answers

What muscle is primarily responsible for the movement of the mandibular fossa in relation to the temporomandibular joint (TMJ)?

  • Lateral pterygoid muscle (correct)
  • Temporalis muscle
  • Medial pterygoid muscle
  • Masseter muscle
  • Which ligament is specifically noted as the only proper ligament that supports the temporomandibular joint?

  • Sphenomandibular ligament (correct)
  • Temporo-mandibular ligament
  • Stylomandibular ligament
  • Articular disc ligament
  • What is the role of the fibrous capsule surrounding the TMJ?

  • To prevent dislocation of the joint
  • To serve as an attachment for surrounding muscles (correct)
  • To provide blood supply to the joint
  • To assist in joint lubrication
  • Which structure is attached around the periphery of the mandibular fossa?

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

    Which of the following ligaments is not located laterally to the temporomandibular joint?

    <p>Sphenomandibular ligament (C)</p> Signup and view all the answers

    What structure does the stylo-mandibular ligament attach to above?

    <p>Styloid process (D)</p> Signup and view all the answers

    Which muscle primarily facilitates the depression (opening) of the mouth during TMJ movement?

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

    What is the function of the sphenomandibular ligament in relation to TMJ?

    <p>Anchors the mandible during depression (D)</p> Signup and view all the answers

    Which of the following movements is performed by the medial pterygoid muscle?

    <p>Elevation of the mandible (C)</p> Signup and view all the answers

    Which ligament is located on the medial aspect of the TMJ?

    <p>Sphenomandibular ligament (C)</p> Signup and view all the answers

    Which muscles are primarily involved in the elevation of the mandible?

    <p>Temporalis and masseter (C)</p> Signup and view all the answers

    The articulation between the articular disc and the mandible during TMJ movement primarily involves which movement?

    <p>Gliding movement (D)</p> Signup and view all the answers

    Which of the following ligaments is pierced by the inferior alveolar nerve and vessels?

    <p>Sphenomandibular ligament (D)</p> Signup and view all the answers

    Which movement occurs during the protrusion of the mandible?

    <p>Forward movement (C)</p> Signup and view all the answers

    What is the primary function of the lateral pterygoid muscle?

    <p>To enable depression and protrusion of the mandible (D)</p> Signup and view all the answers

    Which bone is not involved in forming the Asterion?

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

    What is the shape of the anterior fontanelle?

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

    At what age does the posterior fontanelle typically close?

    <p>6 months (B)</p> Signup and view all the answers

    Which structure is part of the middle cranial fossa?

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

    Which part of the mandible is associated with the mental protuberance?

    <p>Body (C)</p> Signup and view all the answers

    What is the role of the cribriform plate of the ethmoid bone?

    <p>Allows passage of olfactory nerves (D)</p> Signup and view all the answers

    Which structure forms the posterior boundary of the mandible?

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

    What is the primary muscle affecting the temporomandibular joint?

    <p>Masseter (D)</p> Signup and view all the answers

    Which ligament is associated with resistance during opening of the mouth?

    <p>Temporomandibular ligament (C)</p> Signup and view all the answers

    Which of the following is a common disorder of the temporomandibular joint?

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

    What is the primary support structure of the mandibular ramus?

    <p>Coronoid process (D)</p> Signup and view all the answers

    Which cranial fossa is located anteriorly?

    <p>Anterior cranial fossa (B)</p> Signup and view all the answers

    What connects the mandible to the skull?

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

    Which muscle is primarily responsible for the closing of the jaw?

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

    Flashcards

    Mandibular fossa

    Part of the temporal bone that forms part of the temporomandibular joint (TMJ).

    Temporomandibular ligament

    Triangular ligament supporting the TMJ; on the lateral aspect of the joint.

    Articular eminence

    Part of the temporal bone, on the superior surface of the TMJ, forming part of the joint.

    TMJ fibrous capsule

    A capsule surrounding the TMJ, attached to its periphery.

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    Lateral pterygoid muscle

    Muscle that inserts on the TMJ, playing a role in jaw movements.

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    Stylomandibular ligament

    A cord-like ligament located on the posterior aspect of the TMJ, connecting the styloid process to the angle and posterior border of the mandible.

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    Sphenomandibular ligament

    A cord-like ligament located on the medial aspect of the TMJ, connecting the sphenoid bone to the lingula of the mandible.

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    Depression (mouth opening)

    The movement of opening the mouth, combining a hinge-like rotation of the mandible and a gliding movement of the articular disc.

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    Lateral pterygoid muscle

    A muscle that plays a major role in depression (opening) of the mandible, assisting the articular disc forward and downward.

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    Elevation (mouth closing)

    The movement of closing the mouth, mainly done by the medial pterygoid, masseter, and temporalis muscles.

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    Protrusion (forward movement)

    The forward movement of the mandible, primarily generated by the medial and lateral pterygoid muscles.

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    TMJ

    Temporomandibular Joint; The joint connecting the jawbone to the skull.

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    Ligaments of TMJ

    Structures that connect the bones of the TMJ, providing stability.

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    Hinge Movement

    A rotational movement around a fixed axis. Used for mouth opening and closing.

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    Glide Movement

    Sliding movement; used during TMJ opening, with movement of the mandible in relation to temporal bone.

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    Asterion

    The junction of the parietal, occipital, and mastoid portions of the temporal bones.

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    Fontanelles

    Membranous areas in the infant skull, allowing for overlap during birth.

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    Anterior Fontanelle

    Rhomboid-shaped fontanelle that closes at 1.5 years.

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    Posterior Fontanelle

    Triangular fontanelle that closes at 6 months.

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    Cranial Fossae

    The three depressions within the cranium: anterior, middle, and posterior.

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    Anterior Cranial Fossa

    The topmost cranial fossa, housing parts of frontal lobe.

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    Middle Cranial Fossa

    Middle Cranial fossa holds the temporal lobes.

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    Posterior Cranial Fossa

    The lowest cranial fossa containing the cerebellum.

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    Mandible

    The lower jawbone

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    Ramus of mandible

    The vertical part of the mandible.

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    Body of the mandible

    The horizontal part of the mandible.

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    Alveolar Margin

    The margin where the teeth are housed.

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    Pterygoid Processes

    Paired wing-like structures of the sphenoid bone.

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    Mental Protuberance

    A bony projection on the chin.

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    Mandibular Notch

    Indentation between the ramus and the coronoid process.

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    Temporal Bone

    Bone that forms part of the side and base of the skull.

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