Question 1

Which muscle is primarily responsible for elevating and retracting the mandible during mastication?

Accepted Answer

Temporalis

Question 2

A patient presents with difficulty smiling and cannot draw the angle of their mouth superiorly and laterally. Which muscle is most likely impaired?

Accepted Answer

Zygomaticus major

Question 3

Which muscle acts as an antagonist to the zygomaticus major by drawing the corner of the mouth down and laterally, as seen in a 'tragedy mask' expression?

Accepted Answer

Depressor anguli oris

Question 4

During whistling, which muscle is primarily responsible for closing, shaping, and protruding the lips?

Accepted Answer

Orbicularis oris

Question 5

A trumpet player relies on which muscle to compress the cheek and keep food on the occlusal surface of the teeth?

Accepted Answer

Buccinator

Question 6

Which muscle is superficial to the occipital bone and functions to draw the scalp posteriorly?

Accepted Answer

Occipitalis

Question 7

If a patient cannot elevate their upper lip or open their lips, which muscle is most likely affected?

Accepted Answer

Levator labii superioris

Question 8

Which muscle is responsible for tensing the skin of the neck during shaving and also depresses the mandible?

Accepted Answer

Platysma

Question 9

A patient with damage to the orbicularis oculi muscle would most likely have difficulty with which function?

Accepted Answer

Closing the eyelids

Question 10

Which muscle is well developed in infants and is essential for sucking and blowing?

Accepted Answer

Buccinator

Question 11

Which muscle is the strongest jaw mover and is located lateral to the mandibular ramus?

Accepted Answer

Masseter

Question 12

A patient is unable to depress their lower lip. Which muscle is most likely impaired?

Accepted Answer

Depressor labii inferioris

Question 13

Which muscle is fan-shaped and helps maintain the position of the mandible at rest?

Accepted Answer

Temporalis

Question 14

Which muscle is two-headed and is involved in elevating and protracting the mandible, as well as side-to-side movements?

Accepted Answer

Medial pterygoid

Question 15

If the frontalis muscle is paralyzed, which facial expression would be most affected?

Accepted Answer

Wrinkling the skin of the forehead

Question 16

Which muscle is involved in both facial expression and mastication by compressing the cheek and keeping food on the occlusal surface?

Accepted Answer

Buccinator

Question 17

A patient who cannot pucker their lips for whistling likely has damage to which muscle?

Accepted Answer

Orbicularis oris

Question 18

Which muscle draws the outer part of the lower lip inferiorly and posteriorly, as in pouting?

Accepted Answer

Platysma

Question 19

Which muscle surrounds the rim of the eyelid and acts as a sphincter to close the eye?

Accepted Answer

Orbicularis oculi

Question 20

Which muscle is responsible for elevating and protracting the mandible, and is a synergist of the pterygoids for side-to-side movement?

Accepted Answer

Medial pterygoid

Muscles of Facial Expression and Mastication: Structure and Function

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