Deck 7: Muscles of Mastication and the Temporomandibular Joint

Question 1

What muscle causes the gliding motion of the mandibular condyle over the articular eminence?

Answer 1

Lateral pterygoid

Question 2

What two bones are involved in movement of the jaw?

Answer 2

Mandible, temporal bone

Question 3

What is the innervation of all primary muscles of mastication?

Answer 3

Mandibular division of the trigeminal nerve, mandibular nerve

Question 4

Which primary muscle of mastication is not located in either the temporal or infratemporal fossae?

Question 5

Which salivary gland partially covers the masseter muscle?

Question 6

Why is the buccinator, a muscle of facial expression, also considered an accessory muscle of mastication?

Question 7

What is the common attachment of the anterior and posterior bellies of the digastric muscle?

Question 8

What two accessory muscles of mastication compose the floor of the mouth?

Question 9

What feature of the temporal bone forms the anterior border of the mandibular fossa?

Question 10

What two movements are required to open the mouth?

Question 11

The ____________________ forms the lateral boundary of the temporal fossa.

Question 12

The ____________________ muscle inserts into the articular disc of the TMJ.

Question 13

The ____________________ separates the mandibular fossa from the tympanic portion of the temporal bone.

Question 14

The ____________________ divides the TMJ into upper and lower joint cavities.

Question 15

The neurovascular bundle that supplies the TMJ can be found in the ____________________, located behind the articular disc.

Question 16

The muscle that inserts on the temporomandibular joint and protrudes the mandible is the ____________________.

Question 17

The ____________________ ligament limits both lateral and posterior displacement of the mandible.

Question 18

When the mouth is normally closed, the condylar head of the mandible lies in the ____________________ of the temporal bone.

Question 19

The ____________________ ligament supports the capsule of the TMJ.

Question 20

The inferior boundary of the temporal fossa is the ____________________.

Question 21

All accessory muscles of mastication depress the mandible except the ____________________.

Question 22

The ____________________ passes superficial to the masseter muscle en route to the oral cavity.

Question 23

The temporomandibular joint is a ____________________ type of joint.

Question 24

Contraction of the ____ produces a gliding movement of the TMJ.

A) medial pterygoid muscle
B) temporalis muscle
C) posterior belly of the disgastric muscle
D) masseter muscle
E) lateral pterygoid muscle

Question 25

Which of the following nerves provides sensory innervation to the temporomandibular joint?

A) Branches of the maxillary division of the trigeminal nerve
B) Auriculotemporal nerve
C) Facial nerve
D) Branches of the mandibular division of the trigeminal nerve
E) Vagus nerve

Question 26

Which of the following muscles occupies the temporal fossa?

A) Masseter
B) Medial pterygoid
C) Temporalis
D) Frontalis
E) Lateral pterygoid

Question 27

The anterior boundary of the infratemporal fossa is formed by the ____ bone.

A) maxillary
B) sphenoid
C) temporal
D) zygomatic
E) parietal

Question 28

Which of the following bony features forms the posterior boundary of the infratemporal fossa?

A) Ramus of the mandible
B) Lateral pterygoid plate of the sphenoid bone
C) Zygomatic arch
D) Infratemporal crest of the sphenoid bone
E) Styloid process of the temporal bone

Question 29

The ____ forms the medial boundary of the infratemporal fossa.

A) ramus of the mandible
B) lateral pterygoid plate of the sphenoid bone
C) zygomatic arch
D) infratemporal crest of the sphenoid bone
E) styloid process of the temporal bone

Question 30

Which of the following bones forms the lateral boundary of the infratemporal fossa?

A) Sphenoid
B) Temporal
C) Zygomatic
D) Mandible
E) Parietal

Question 31

The insertion of the temporails muscle is the

A) mandibular condyle.
B) medial surface of the mandibular ramus.
C) coronoid process of the mandible.
D) articular capsule of the TMJ.
E) lateral surface of the mandibular ramus.

Question 32

The medial pterygoid muscle inserts on the

A) medial surface of the mandibular ramus.
B) temporomandibular joint.
C) maxilla.
D) coronoid process.
E) medial pterygoid plate.

Question 33

Each of the following muscles are innervated by the mandibular division of the trigeminal nerve except the

A) temporalis.
B) posterior belly of the digastric.
C) medial pterygoid.
D) anterior belly of the digastric.
E) mylohyoid.

Question 34

The masseter muscle originates from the

A) lateral pterygoid plate.
B) maxillary tuberosity.
C) zygomatic arch.
D) ramus of the mandible.
E) greater wing of the sphenoid bone.

Question 35

All of the following muscles insert into the mandible except the

A) temporalis.
B) anterior belly of the digastric.
C) medial pterygoid.
D) posterior belly of the digastric.
E) masseter.

Question 36

Which of the following ligaments limits posterior displacement of the TMJ?

A) Stylomandibular
B) Lateral temporomandibular
C) Sphenomandibular
D) Stylohyoid
E) Medial temporomandibular

Question 37

The temporalis muscle

A) inserts on the angle of the mandible.
B) depresses and retrudes the mandible.
C) originates from the zygomatic arch.
D) opens and closes the mandible.
E) elevates and retrudes the mandible.

Question 38

Which muscle of mastication opens the mouth?

A) Anterior belly of the digastric
B) Geniohyoid muscle
C) Medial pterygoid muscle
D) Masseter muscle
E) Lateral pterygoid muscle

Question 39

Which of the following statements is incorrect?

A) The articular capsule of the temporomandibular joint attaches peripherally to the articular disc.
B) The articular disc of the temporomandibular joint is biconcave.
C) The retrodiscal pad lies behind the articular disc of the temporomandibular joint.
D) The stylomandibular ligament helps to stabilize the temporomandibular joint.
E) The sphenomandibular ligament of the temporomandibular joint limits posterior displacement of the joint.

Question 40

The mandibular notch is found between the coronoid process of the mandible and the

A) alveolar process.
B) mental tubercle.
C) condylar process.
D) coronoid notch.
E) oblique line.

Question 41

Which of the following statements is incorrect?

A) The lateral border of the temporal region is the fascia covering the temporalis muscle.
B) The temporal fascia is an extension of investing cervical fascia.
C) The temporalis muscle passes medial to the zygomatic arch to reach the infratemporal fossa.
D) The posterior fibers of the temporalis muscle retrude the mandible.
E) The masseter muscle is found within the temporal fossa.

Question 42

Which of the following muscles is not considered a primary muscle of mastication?

A) Temporalis
B) Buccinator
C) Masseter
D) Lateral pterygoid
E) Medial pterygoid

Question 43

Which of the following statements is incorrect?

A) The lateral pterygoid muscle inserts on both the articular capsule and the articular disc of the temporomandibular joint.
B) Acting together, the lateral pterygoid muscles protrude the mandible.
C) The masseter muscle has a superficial and a deep head.
D) The medial pterygoid muscles elevate and protrude the mandible.
E) The fibers of the medial pterygoid muscle lie at right angles to those of the masseter muscle.

Question 44

Which of the following pairs describing the walls of the infratemporal fossa is incorrect?

A) Anterior wall-maxillary tuberosity
B) Superior wall-zygomatic arch
C) Superior wall-greater wing of the sphenoid
D) Lateral wall-ramus of the mandible
E) Medial wall-medial pterygoid plate

Question 45

Which of the following muscles of mastication are located in the infratemporal fossa? (Select all that apply.)

A) Temporalis
B) Lateral pterygoid
C) Masseter
D) Buccinator
E) Medial pterygoid

Question 46

The medial boundary of the temporal fossa is formed by portions of which of the following bones? (Select all that apply.)

A) Frontal
B) Sphenoid
C) Zygomatic
D) Temporal
E) Parietal

Question 47

The temporalis muscle originates from portions of which of the following bones? (Select all that apply.)

A) Zygomatic
B) Temporal
C) Sphenoid
D) Parietal
E) Frontal

Question 48

Closing of the mouth is accomplished by which of the following muscles? (Select all that apply.)

A) Medial pterygoid
B) Masseter
C) Posterior belly of the digastric
D) Temporalis
E) Lateral pterygoid

Question 49

Which of the following muscles act to protrude the mandible? (Select all that apply.)

A) Temporalis
B) Medial pterygoid
C) Geniohyoid
D) Lateral pterygoid
E) Masseter

Question 50

Depression of the mandible is accomplished by which of the following muscles? (Select all that apply.)

A) Geniohyoid
B) Posterior belly of the digastric
C) Mylohyoid
D) Buccinator
E) Anterior belly of the digastric

Question 51

Accessory muscles of mastication innervated by the facial nerve include the (select all that apply)

A) geniohyoid.
B) buccinator.
C) posterior belly of the digastric.
D) mylohyoid.
E) anterior belly of the digastric.

Question 52

Contraction of which of the following muscles allows retrusion of the mandible? (Select all that apply.)

A) Masseter
B) Posterior belly of the digastric
C) Geniohyoid
D) Temporalis
E) Medial pterygoid

Question 53

Which of the following accessory muscles of mastication share the same general innervation as the primary muscles of mastication? (Select all that apply.)

A) Geniohyoid
B) Buccinator
C) Posterior belly of the digastric
D) Mylohyoid
E) Anterior belly of the digastric

Question 54

A patient is unable to move the mandible from side to side while chewing. Which of the following muscles is most likely injured? (Select all that apply.)

A) Buccinator
B) Medial pterygoid
C) Anterior belly of the digastric
D) Masseter
E) Lateral pterygoid

Question 55

Which of the following structures attach to the articular disc of the TMJ?

A) Articular capsule
B) Medial pterygoid muscle
C) Articular tubercle
D) Mandibular condyle
E) Lateral pterygoid muscle

Question 56

Retrusion of the jaw is accomplished by which of the following muscles?

A) Buccinator
B) Medial pterygoid
C) Temporalis
D) Masseter
E) Lateral pterygoid

Question 57

Match the muscle with its correct origin.

-Maxillary tuberosity

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 58

Match the muscle with its correct origin.

-Mental spine

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 59

Match the muscle with its correct origin.

-Mastoid process

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 60

Match the muscle with its correct origin.

-Zygomatic arch

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 61

Match the muscle with its correct origin.

-Intermediate tendon on hyoid bone

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 62

Match the muscle with its correct origin.

-Greater wing of sphenoid bone

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 63

Match the muscle with its correct origin.

-Pterygomandibular raphe

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 64

Match the muscle with its correct origin.

-Temporalis fascia

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric

Question 65

Match the muscle with its correct origin.

-Mylohyoid line

A) Mylohyoid
B) Lateral pterygoid
C) Buccinator
D) Masseter
E) Anterior belly of the digastric
F) Temporalis
G) Geniohyoid
H) Medial pterygoid
I) Posterior belly of the digastric