Deck 30: Muscles of Facial Expression

Question 1

The orbicularis oris and orbicularis oculi circle the oral cavity. The muscles of the orbicularis oculi circle the lips like a purse string.

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

Answer 1

D
The orbicularis oculi circles the eye; the orbicularis oris circles the oral cavity. Note that the Latin term orbicularis relates to the word circular. The muscles of the orbicularis oris circle the lips like a purse string, and all the surrounding muscles interlace with them.

Question 2

Which muscle originates from the lower rim of the orbit?

A) Orbicularis oris
B) Procerus
C) Levator labii superioris
D) Levator anguli oris

Answer 2

C
The levator labii superioris originates from the lower rim of the orbit and inserts into the upper eyelid. As the term levator indicates, this muscle raises the upper (superior) labii (lid). This muscle is supplied by the III cranial nerve (oculomotor). Therefore, it is considered a muscle of the orbit and not a facial muscle.

Question 3

The posterior auricular muscle can raise the ear. Fibers of this poorly developed muscle run forward.

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

Answer 3

B
The posterior auricular muscle is probably the best developed of the ear muscles. Fibers run forward to insert into the posterior part of the ear.

Question 4

The orbicularis oris is probably the most important muscle of the mouth because in addition to its role in forming facial expressions, this muscle is also referred to as an accessory muscle of mastication.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 5

Both the corrugator and the platysma pull the eyebrow up. The corrugator muscle has fibers that extend to the lateral part of the eyebrow whereas the procerus has fibers that extend to the medial end of the eyebrow.

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

Question 6

The dilator naris raises the nostrils. This muscle causes the nostrils to flare or dilate.

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

Question 7

The facial nerve innervates the muscles of facial expression and mastication. The facial nerve is the fifth cranial nerve.

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

Question 8

The muscle that originates from the pterygoid hamulus to the medial surface of the mandible at the posterior end of the mylohyoid line is the

A) Buccinator
B) Levator labii superioris
C) Depressor labii inferioris
D) Orbicularis oris

Question 9

The levator palpebrae superioris is not considered a facial nerve because it is not innervated by the facial nerve.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 10

The orbicularis oculi raises the eyelids because fibers of this muscle attach to the medial and lateral borders of the orbit.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 11

Which muscle plays a role in mastication?

A) Buccinator
B) Orbicularis oris
C) Levator labii superioris
D) Depressor labii inferioris

Question 12

Which muscle opens and closes the nostrils?

A) Nasalis
B) Naris
C) Dilator naris
D) Compressor naris

Question 13

The muscle that arises from the superior nuchal line of the occipital bone and the mastoid area is the

A) Orbicularis oculi
B) Occipital belly of the epicranius muscle
C) Superior auricular
D) Posterior auricular

Question 14

Which muscle compresses the lips?

A) Levator labii superioris
B) Depressor labii inferioris
C) Levator anguli superioris
D) Orbicularis oris

Question 15

The levator palpebrae superioris muscle is considered a muscle of the orbit because it is supplied by both the oculomotor and facial nerves.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 16

The epicranius muscle is known by what other name?

A) Anterior auricular
B) Frontalis
C) Occipitofrontalis
D) Platysma

Question 17

The mentalis muscle fibers originate in the mental foramen. These fibers terminate by inserting into the skin of the chin.

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

Question 18

The muscles grouped around the mouth do not influence tooth alignment because abnormal pressures from one muscle group are balanced by muscles of other groups.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 19

The facial nerve innervates the muscles of facial expression and mastication. The facial nerve is the fifth cranial nerve.

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

Question 20

The upper end of fibers of the platysma attach to the inferior border of the mandible. The platysma moves the skin over the neck, but it doesn't change the facial expression.

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

Question 21

Which of the following can be influenced by abnormal pressure from the muscles that surround the mouth (select all that apply)?

A) Mastication
B) Facial expression
C) Ability to close eyelids
D) Raising the upper eyelid
E) Speech patterns

Question 22

All of the muscles surrounding the oral cavity interlace with the orbicularis oris.

Question 23

Which of the following are true of the buccinator muscle (select all that apply)?

A) It is probably the most important muscle of the mouth.
B) It has no role in mastication.
C) It originates from the pterygomandibular raphe.
D) It originates from the buccal alveolar bone of the maxillary molars.
E) It makes up the musculature of the cheek.

Question 24

Fibers of the mentalis muscle cross the midline.

Question 25

Which does NOT have a role in frowning (select all that apply)?

A) Corrugator
B) Procerus
C) Mentalis
D) Buccinator

Question 26

The muscles of the scalp move the scalp in a forward but not a backward movement.

Question 27

The action of the orbicularis oris is to close and compress the lips.

Question 28

The risorius muscle pulls the corners of the mouth down as in a frown.

Question 29

Fibers of the platysma run from the maxilla to just below the clavicle in a broad sheet.