Deck 13: Temporomandibular Joint

Question 1

The upper compartment of the temporomandibular cavity is bound superiorly by the articular fossa and inferiorly by the

A) head of the mandibular condyle.
B) articular disk.
C) articular eminence.
D) temporal bone.

Answer 1

B

Question 2

When the mouth opens,each condylar head slides along the articular ________.

A) pad
B) fossa
C) plane
D) eminence

Answer 2

C

Question 3

Which of the following best describes the synovial membrane?

A) Thin layer of synovial cells
B) Sterile,highly viscous fluid
C) Dense,collagenous fibrous pad
D) Fibrous capsule that encloses the temporomandibular joint

Answer 3

A

Question 4

The lateral pterygoid muscle does which of the following?

A) Retracts the mandible
B) Protracts and elevates the mandible
C) Elevates the mandible and clenches the teeth
D) Protrudes the mandible and pulls the articular disk forward

Question 5

The spine of bone arising from the rim of the mandibular foramen is called the

A) mental foramen.
B) genial tubercles.
C) submandibular fossa.
D) lingula.

Question 6

The heads of mandibular condyles form secondary ossification centers.Secondary ossification centers produce epiphyseal lines (cartilage-bone junctions).

A) Both statements are true.
B) Both statements are false.
C) The first statement is true;the second is false.
D) The first statement is false;the second is true.

Question 7

A mature mandibular condyle exhibits which characteristic?

A) The condylar head is a round shape.
B) Bone covers the head of the condyle.
C) A thick layer of cartilage covers the head of the condyle.
D) Spikes of porous cartilage project into the underlying bone marrow.

Question 8

Where is the temporomandibular fossa located?

A) Medial to the zygomaticofrontal suture
B) Within the periphery of the zygomatic arch
C) At the posterior medial aspect of the zygomatic arch
D) Along the anterior upper border of the zygomatic arch

Question 9

Which feature of the TMJ helps it withstand functional stress?

A) Presence of cartilage on the condyle and fossa.
B) Encapsulated nerve terminals in the synovial folds.
C) Functional relationship with the muscles of mastication.
D) Network of blood vessels in the posterior region of the joint.

Question 10

The synovial membrane is associated with numerous capillaries and _________.

A) fluids
B) bones
C) ligaments
D) lymphatics

Question 11

Which of the following is not a function of the temporomandibular joint (TMJ)?

A) Speech
B) Deglutition
C) Respiration
D) Mastication

Question 12

Which of the following ligaments do not support the temporomandibular joint?

A) Stylohyoid
B) Stylomandibular
C) Sphenomandibular
D) Temporomandibular

Question 13

Which of the following is a function of the temporomandibular joint capsule?

A) Provides joint lubrication
B) Supports articulatory movements
C) Encloses the lateral,medial,and posterior boundaries
D) Keeps the disk immobile when the head of the condyle moves

Question 14

Articular remodeling is a response to _______________.

A) aging
B) inactivity
C) genetic dysfunction
D) environmental stress

Question 15

The articular fossa undergoes which developmental change?

A) Deepens and expands
B) Becomes brittle and narrow
C) Loses flexibility and perforates
D) Becomes increasingly scalloped in shape

Question 16

At birth,the heads of the mandibular condyles are round and covered with a thick layer of

A) bone.
B) cartilage.
C) fibrous connective tissue.
D) elastic connective tissue.

Question 17

Which ligament attaches to the lateral part of the disk?

A) Stylohyoid
B) Stylomandibular
C) Sphenomandibular
D) Temporomandibular

Question 18

A mature mandibular condyle is which shape?

A) Ovoid
B) Circular
C) Crescent
D) Triangular

Question 19

Which ligament extends down the medial side of the ramus to insert on the lingula?

A) Stylohyoid
B) Stylomandibular
C) Sphenomandibular
D) Temporomandibular

Question 20

Which of the following is a function of the lateral ligament of the temporomandibular joint?

A) Operates in retraction of the disk.
B) Strengthens the capsule and allows freedom of condylar movement.
C) Provides strong insulation between the condylar heads and articular surfaces.
D) Supports the joint and limits excursions of the condyles to a normal range.

Question 21

Which of the four muscles of mastication protracts the mandible?

A) Medial pterygoid muscle
B) Lateral pterygoid muscle
C) Masseter muscle
D) Temporalis muscle

Question 22

At birth,condylar heads are round and covered with a thick layer of cartilage.

Question 23

The action of the lower half of the TMJ is a gliding motion.

Question 24

The two movements of the temporomandibular joint (TMJ)are

A) gliding and hinge.
B) superior and inferior.
C) medial and lateral.
D) anterior and posterior.

Question 25

More blood vessels innervate the lateral and medial surfaces of the articular disk than the anterior and posterior areas.

Question 26

Chondroblasts of the mandibular condyles are organized in long rows.

Question 27

Cartilage-bone remodeling is not possible.

Question 28

No epiphyseal line is found in the TMJ condyle.

Question 29

Each of the following is a branch of the mandibular division of the trigeminal nerve that supplies the temporomandibular joint (TMJ)EXCEPT one.Which one is the EXCEPTION?

A) Auriculotemporal nerve
B) Deep temporal nerve
C) Masseteric nerve
D) Inferior alveolar nerve

Question 30

Which of the following types of nerve endings found in the temporomandibular joint (TMJ)is a pressure receptor?

A) Pacinian nerve endings
B) Ruffini nerve endings
C) Meissner nerve endings
D) Free nerve endings

Question 31

Every individual has eight muscles of mastication.

Question 32

The articular disk is thin but highly vascular.