Muscles of Facial Expression

Question 1

Origin of Orbicularis Oris

Answer 1

Origin:

encircles the mouth

Question 2

Insertion of Orbicularis Oris

Answer 2

Insertion:

angle of the mouth

Question 3

Expression of Orbicularis Oris

Answer 3

Expression:

closing or pursing lips

Question 4

Origin of Buccinator

Answer 4

Origin:

maxilla, mandible, and pterygoid raphe

Question 5

Insertion of Buccinator

Answer 5

Insertion:

angle of the mouth

Question 6

Expression of Buccinator

Answer 6

Expression:
flattens cheeks; assists in chewing
ASSISTS MUSCLES OF MASTICATION

Question 7

Origin of Risorius

Answer 7

Origin:

fascia superficial to masseter muscle

Question 8

Insertion of Risorius

Answer 8

Insertion:

angle of the mouth

Question 9

Expression of Risorius

Answer 9

Expression:

smiling widely

Question 10

Origin of Zygomaticus

Answer 10

Origin:

zygomatic bone

Question 11

Insertion of Zygomaticus (major & minor)

Answer 11

Insertion:

• Major: angle of the mouth
• Minor: upper lip
• • “SMILING MUSCLE” **

Question 12

Expression of Zygomaticus

Answer 12

Expression:

smiling and raising upper lip

Question 13

Origin of Levator anguli oris

Answer 13

Origin:

maxilla

Question 14

Insertion of Levator anguli oris

Answer 14

Insertion:

angle of the mouth

Question 15

Expression of Levator anguli oris

Answer 15

Expression:

smiling

Question 16

Origin of Depressor anguli oris

Answer 16

Origin:

mandible

Question 17

Insertion of Depressor anguli oris

Answer 17

Insertion:

angle of the mouth

Question 18

Expression of Depressor anguli oris

Answer 18

Expression:

frowning

Question 19

All facial muscles are innervated by what nerve and blood supply?

Answer 19

all facial muscles are innervated by 7th (VII) cranial nerve or facial nerve; blood supply from the facial artery (branch of the external carotid artery)

Question 20

NOTE*

Answer 20

in general facial muscles have origins with bone and insertions in skin tissue