Temporomandibular Articulation Quiz
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Questions and Answers

What type of joint is the Temporo-mandibular joint (TMJ)?

  • Fibrous joint
  • Ginglymoid joint
  • Cartilagenous joint
  • Synovial joint (correct)

    • Which of the following is NOT a synonym for the Temporo-mandibular joint?

  • Mandibular Joint
  • Atlanto-occipital Joint (correct)
  • Jaw Joint
  • Craniomandibular Joint

    • How many TMJs are present in the human body?

  • 3
  • 4
  • 2 (correct)
  • 1

    • What type of movement does the TMJ provide in one plane?

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

    What is the name of the bone that forms the articulating surface of the TMJ?

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

    What is the term for the joint that provides both hinging and sliding movements?

    <p>Ginglymoarthrodial joint</p> Signup and view all the answers

    What is the classification of the TMJ based on its structure?

    <p>Diarthrodial joint</p> Signup and view all the answers

    How many articular surfaces are present in the TMJ?

    <p>2</p> Signup and view all the answers

    What is the function of the articular disc in the temporomandibular joint?

    <p>To reduce wear on the joint</p> Signup and view all the answers

    What is the purpose of the TMJ ligaments?

    <p>To serve as passive restraints on mandibular motion</p> Signup and view all the answers

    What is the main function of the collateral ligament?

    <p>To attach the disk to the lateral and medial poles of each condyle</p> Signup and view all the answers

    What is the composition of the TMJ capsule?

    <p>Fibroelastic, highly vascular and innervated dense connective tissue</p> Signup and view all the answers

    What is the function of the sphenomandibular ligament?

    <p>Remnants of Meckel's cartilage</p> Signup and view all the answers

    What is the anatomical basis of the articular surface of the temporal bone?

    <p>Articular eminence, glenoid fossa, and articular tubercle</p> Signup and view all the answers

    What is the shape of the TMJ capsule?

    <p>Funnel-shaped</p> Signup and view all the answers

    What is the function of the articular tubercle or postglenoid tubercle?

    <p>It is a point of attachment of collateral ligaments</p> Signup and view all the answers

    What is the shape of the glenoid fossa?

    <p>Smooth and oval</p> Signup and view all the answers

    What is the function of the lateral/TMJ ligament?

    <p>To function in paired fashion</p> Signup and view all the answers

    What is the purpose of the stylomandibular ligament?

    <p>To limit excessive protrusion of the mandible</p> Signup and view all the answers

    What is the characteristic of the articular part of the condyle?

    <p>It is covered by fibrocartilage</p> Signup and view all the answers

    What is the characteristic of the articular disc?

    <p>It is oval, avascular, and non-innervated in the middle</p> Signup and view all the answers

    What is the characteristic of the upper joint space?

    <p>It is larger (1.2ml)</p> Signup and view all the answers

    What is the posterior bilaminar zone characterized by?

    <p>It has a rich neurovascular supply</p> Signup and view all the answers

    What are the three general regions of the articular disc as viewed from the lateral perspective?

    <p>Anterior band, central intermediate zone, and posterior band</p> Signup and view all the answers

    Study Notes

    Temporo-mandibular Articulation

    • The temporo-mandibular joint (TMJ) is a diarthrodial, freely movable articulation between the condyle of the mandible and squamous part of the temporal bone.

    Classification of Joints

    • Fibrous joints: two bones connected by fibrous tissue
    • Cartilagenous joints: two bones connected by cartilagenous or bone tissue
    • Synovial joints: two bones united and surrounded by a capsule that creates a joint cavity and permits significant movement

    TMJ Characteristics

    • Bilateral condylar variety of synovial joint
    • Anatomically, it is a diarthrodial joint, which is a discontinuous articulation of two bones
    • Provides a hinging or rotation movement in one plane, thus can be considered as ginglymoid joint
    • Provides a sliding movement, thus called as arthrodial joint
    • Therefore, it can be called as GINGLYMOARTHRODIAL joint

    Anatomy of TMJ

    • Gross Anatomy:
      • Number: present on each side, 2 in number
      • Type: synovial joint
      • Bones involved:
        • Glenoid fossa of temporal bone
        • Condyle of the mandible
    • Articulatory system:
      • Upper articular surface: temporal bone
      • Lower articular surface: mandibular condyle
      • Roof: 2 parts of temporal bone
      • Floor: superior surface of disc
      • Articulating surface of mandibular condyle

    Articular Surfaces

    • Articular surface of temporal bone (Cranial component):
      • Includes three components:
        • Glenoid fossa
        • Postglenoid tubercle
        • Articular eminence
    • Articular surface of mandibular condyle (Mandibular component):
      • Ovoid condylar process (head) with narrow mandibular neck
      • Condyle tends to be rounded mediolaterally and convex anteroposteriorly
      • Broad laterally and narrow medially
      • Covered by fibrocartilage

    Articular Disc

    • Morphology:
      • Derived from mesoderm of 1st pharyngeal arch
      • Biconcave sagitally, thicker anteriorly and thinner posteriorly, oval, avascular, and non-innervated in the middle
      • Can be divided into 3 general regions:
        • Anterior band (2mm)
        • Central intermediate zone (1mm)
        • Posterior band (3 mm)
    • Upper joint space is larger (1.2ml)
    • Lower joint space is smaller (0.9 ml)

    Posterior Disc Attachment/Bilaminar Zone

    • Posteriorly: posterior bilaminar zone with rich neurovascular supply
    • Disc divides into:
      • Inferior lamella
      • Superior lamella

    Function of Articular Disc

    • Condyle and the temporal bone do not fit together in the absence of the disk
    • Stabilization of the temporomandibular joint
    • The articular disc may reduce wear

    TMJ Ligaments

    • Functional ligaments (True Ligaments):
      • Collateral ligament
      • Capsular ligament
      • Lateral ligament
    • Accessory ligaments:
      • Sphenomandibular ligament (remnants of Meckel’s cartilage)
      • Stylomandibular ligament (thick band of deep cervical fascia that limits excessive protrusion of the mandible)

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    Related Documents

    TMJ Temporomandibular Joint Anatomy PDF

    Description

    Explore the definition, classification, and features of the temporomandibular articulation, also known as the jaw joint. Learn about the condyle of the mandible and squamous part of the temporal bone.

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