Temporomandibular Joint (TMJ) Anatomy Quiz
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Questions and Answers

What type of joint is the temporomandibular joint (TMJ)?

The temporomandibular joint (TMJ) is a modified hinge type of synovial joint.

What movements does the temporomandibular joint (TMJ) permit?

It permits gliding (translation) and a small degree of rotation (pivoting) in addition to flexion (elevation) and extension (depression) movements typical for hinge joints.

What are the bony articular surfaces involved in the temporomandibular joint (TMJ)?

The mandibular fossa and articular tubercle of the temporal bone superiorly and the head of the mandible inferiorly.

What separates the two bony articular surfaces in the temporomandibular joint (TMJ)?

<p>The two bony articular surfaces are completely separated by intervening fibrocartilage, the articular disc of the TMJ.</p> Signup and view all the answers

To what does the loose fibrous layer of the joint capsule attach?

<p>The loose fibrous layer of the joint capsule attaches to the margins of the articular cartilage on the temporal bone and around the neck of the mandible.</p> Signup and view all the answers

What is the function of the articular disc in the temporomandibular joint (TMJ)?

<p>The articular disc separates the two bony articular surfaces, creating separate superior and inferior articular cavities.</p> Signup and view all the answers

What attaches to the margins of the articular cartilage on the temporal bone and around the neck of the mandible?

<p>The loose fibrous layer of the joint capsule attaches to the margins of the articular cartilage on the temporal bone and around the neck of the mandible.</p> Signup and view all the answers

What creates the separate superior and inferior articular cavities in the temporomandibular joint (TMJ)?

<p>The intervening fibrocartilage, the articular disc of the TMJ, creates the separate superior and inferior articular cavities.</p> Signup and view all the answers

What are the bony articular surfaces involved in the temporomandibular joint (TMJ) completely separated by?

<p>The bony articular surfaces involved in the temporomandibular joint (TMJ) are completely separated by intervening fibrocartilage, the articular disc.</p> Signup and view all the answers

What type of synovial joint is the temporomandibular joint (TMJ)?

<p>The temporomandibular joint (TMJ) is a modified hinge type of synovial joint.</p> Signup and view all the answers

Flashcards

Temporomandibular Joint (TMJ)

A modified hinge type of synovial joint in the jaw.

Movements of TMJ

Permits gliding, rotation, flexion, and extension movements.

Bony Articular Surfaces of TMJ

Involves the mandibular fossa and articular tubercle of the temporal bone, plus the head of the mandible.

Articular Disc Function

Separates bony surfaces and creates superior and inferior articular cavities.

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Joint Capsule Attachment

Loose fibrous layer attaches to margins of articular cartilage and neck of the mandible.

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Fibrocartilage in TMJ

The intervening fibrocartilage, or articular disc, separates bony articular surfaces.

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Superior Articular Cavity

The articular disc divides the joint into two cavities: superior and inferior.

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Inferior Articular Cavity

The lower part of the TMJ divided by the articular disc.

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Modified Hinge Joint

Describes the unique function of the TMJ, different from typical hinge joints.

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Articular Cartilage

Cartilage covering the bony surfaces where they meet at the joint.

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Study Notes

Temporomandibular Joint (TMJ)

  • TMJ is a modified hinge type of synovial joint
  • Permits gliding (translation), rotation (pivoting), flexion (elevation), and extension (depression) movements

Bony Articular Surfaces

  • Mandibular fossa and articular tubercle of the temporal bone (superiorly)
  • Head of the mandible (inferiorly)

Joint Capsule

  • Loose fibrous layer attaches to the margins of the articular cartilage on the temporal bone
  • Attaches around the neck of the mandible

Articular Disc

  • Intervening fibrocartilage between the two bony articular surfaces
  • Attached at its periphery to the internal aspect of the fibrous capsule

Articular Cavities

  • Superior and inferior articular cavities, or compartments
  • Lined by separate superior and inferior synovial membranes

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Description

Test your knowledge of the temporomandibular joint (TMJ) with this quiz. Explore the anatomy and movements of this synovial joint, and deepen your understanding of the bony articular surfaces involved.

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