Deck 7: Structure and Function of the Temporomandibular Joint

Question 1

In what plane and axis does mandibular elevation and depression occur?

A)Sagittal plane around a medial-lateral (frontal) axis
B)Transverse plane around a vertical axis
C)Frontal plane around a sagittal axis
D)Transverse plane around a medial-lateral (frontal) axis

Answer 1

Sagittal plane around a medial-lateral (frontal) axis

Question 2

What arthrokinematics occur during mandibular protrusion?

A)Disc-condyle complex glides anteriorly
B)Condyles roll anteriorly, and condyles and disc glide posteriorly
C)Disc-condyle complex glides posteriorly
D)Condyles roll posteriorly, and condyles and disc glide anteriorly

Answer 2

Disc-condyle complex glides anteriorly

Question 3

Which of the following muscle groups contracts to elevate the temporomandibular joint?

A)Concentric contraction of bilateral digastric and inferior lateral pterygoid muscles
B)Bilateral contraction of masseter and medial and lateral pterygoid muscles
C)Concentric contraction of bilateral masseter, temporalis, and medial pterygoid muscles
D)Bilateral contraction of posterior fibers of the temporalis muscle and anterior portion of digastric muscle

Answer 3

Concentric contraction of bilateral masseter, temporalis, and medial pterygoid muscles

Question 4

What are the primary muscles of mastication?

A)Masseter, anterior and posterior portions of the digastric muscle
B)Suprahyoid muscle group, masseter
C)Temporalis, masseter, medial and lateral pterygoids
D)Masseter, digastric, medial and lateral pterygoids

Question 5

Which of the following muscle groups contracts to protrude the temporomandibular joint?

A)Concentric contraction of bilateral digastric and inferior lateral pterygoid muscles
B)Bilateral contraction of masseter and medial and lateral pterygoid muscles
C)Concentric contraction of bilateral masseter, temporalis, and medial pterygoid muscles
D)Bilateral contraction of posterior fibers of the temporalis muscle and anterior portion of digastric muscle

Question 6

What are the attachments of the disc located in the temporomandibular joint?

A)Anterior to joint capsule and lateral pterygoid muscle, posterior to connective tissue
B)Lateral to lateral pterygoid muscle, medial to medial pterygoid muscle
C)Anterior to joint capsule and medial pterygoid muscle, posterior to connective tissue
D)Lateral to joint capsule, medial to connective tissue

Question 7

Which of the following statements BEST describes how the temporomandibular joint surface is different from other synovial joints in the body?

A)Joint surface covered with hyaline cartilage that resists repetitive stresses and can repair itself
B)Joint surface covered with hyaline cartilage that undergoes stress and cannot repair itself
C)Joint surface covered with dense fibrocartilage that resists repetitive stresses and can repair itself
D)Joint surface covered with dense fibrocartilage that undergoes stress and cannot repair itself

Question 8

What is the typical range of motion for mandibular lateral excursion?

A)1-5 mm
B)8-11 mm
C)15-20 mm
D)30-40 mm

Question 9

Which of the following statements BEST describes the function of the temporomandibular joint disc?

A)The upper surface and temporal bone form a hinge joint
B)Increases joint stability, decreases joint stress
C)The lower surface and mandibular condyle function as a gliding joint
D)Is able to repair itself when injured

Question 10

What is the function of the temporomandibular ligament?

A)Limits mandibular elevation
B)Limits mandibular protrusion
C)Limits mandibular lateral excursion
D)Limits mandibular depression

Question 11

What are the cardinal signs of temporomandibular joint dysfunction?

A)Joint pain, noise, limited range of motion
B)Joint swelling, pain
C)Joint pain, muscle weakness
D)Joint pain, bruising, limited range of motion

Question 12

What arthrokinematics occur during mandibular depression?

A)Condyles roll posteriorly, and condyles and disc glide anteriorly
B)Condyles roll anteriorly, and condyles and disc glide posteriorly
C)Condyles roll anteriorly, and condyles and disc glide anteriorly
D)Condyles roll posteriorly, and condyles and disc glide posteriorly

Question 13

What is the typical range of motion for mandibular depression?

A)10-20 mm
B)40-50 mm
C)20-30 mm
D)50-100 mm