Anatomy of the TemporoMandibular Joint (TMJ) Quiz

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Questions and Answers

What type of joint is the TemporoMandibular Joint (TMJ)?

  • Fibrous and non-synovial joint
  • Pivot and hinge joint
  • Cartilaginous and non-diarthrodial joint
  • Diarthrodial and synovial joint (correct)

What does the synovial fluid in the TMJ act as?

  • Mechanical reinforcement for the mandible
  • Joint lubricant and supplier of metabolic needs (correct)
  • Nourishment for the articular facets
  • Structural support and cushioning

How many articulating surfaces compose the TMJ?

  • Three
  • Five
  • Four (correct)
  • Two

What is the TMJ disc composed of?

<p>Dense fibrous connective tissue (D)</p> Signup and view all the answers

How many general regions can the TMJ disc be divided into as viewed from the lateral perspective?

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

What are the osseous elements that form the TemporoMandibular Joint?

<p>The squamous portion of the temporal bone and the condyle of the mandible.</p> Signup and view all the answers

How is the joint cavity of the TMJ divided?

<p>The joint cavity is divided into an upper and a lower compartment.</p> Signup and view all the answers

What lines the inner side of the articular capsule and disc in the TMJ?

<p>A synovial membrane.</p> Signup and view all the answers

What fills the joint compartments of the TMJ?

<p>Synovial fluid produced by the lining membrane.</p> Signup and view all the answers

What is the function of the synovial fluid in the TMJ?

<p>Synovial fluid lubricates the joint and nourishes the articular cartilage.</p> Signup and view all the answers

Flashcards

TemporoMandibular Joint (TMJ) type

Diarthrodial and synovial joint.

Synovial fluid function in the TMJ

Joint lubricant and supplier of metabolic needs.

Number of articulating surfaces in the TMJ

Four articulating surfaces.

TMJ disc composition

Dense fibrous connective tissue.

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Regions of the TMJ disc

Three regions (anterior, intermediate, and posterior bands).

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Osseous elements of the TMJ

Squamous portion of temporal bone and condyle of the mandible.

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Division of TMJ joint cavity

Upper and lower compartments.

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Lining of the articular capsule and disc in the TMJ

A synovial membrane.

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What fills the joint compartments of the TMJ

Synovial fluid.

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Function of synovial fluid in the TMJ

Lubricates the joint and nourishes the articular cartilage.

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Study Notes

TemporoMandibular Joint (TMJ)

  • The TemporoMandibular Joint (TMJ) is a synovial hinge-type joint.

Composition of the TMJ

  • The TMJ has two articulating surfaces.
  • The TMJ disc is composed of fibrocartilage.
  • The TMJ disc can be divided into three general regions when viewed from the lateral perspective: anterior, intermediate, and posterior.

Formation of the TMJ

  • The osseous elements that form the TemporoMandibular Joint are the mandibular fossa of the temporal bone and the condyle of the mandible.

Joint Cavity of the TMJ

  • The joint cavity of the TMJ is divided into upper and lower compartments.

Inner Lining of the TMJ

  • The inner side of the articular capsule and disc in the TMJ is lined with synovial membrane.

Joint Compartments of the TMJ

  • The joint compartments of the TMJ are filled with synovial fluid.

Function of the Synovial Fluid

  • The synovial fluid in the TMJ acts as a lubricant and shock absorber.
  • The function of the synovial fluid in the TMJ is to reduce friction and absorb shock between the articulating bones.

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