Facial Muscles and Muscles of Mastication

Question 1

What are the facial muscles innervated by?

Answer 1

Facial nerve

Question 2

General movements of the orbital group?

Answer 2

Control movement of the eyelid and so protect the cornea from damage

Question 3

Name the muscles of the orbital group

Answer 3

Orbicularis oculi

Corrugator supercillii

Question 4

Movements of the orbiculares oculi?

Answer 4

Inner palpebral part closes the eye gently Outer orbital part does it more forcefully

Question 5

Actions of the corrugator supercillii?

Answer 5

Draws eyebrows together

Question 6

Where is the corrugator supercillii located in relation to the orbicularis oculi? Desribe it.

Answer 6

Smaller

Posterior to the OO

Inserts into the skin of the eyebrow

Question 7

Name the facial muscles of the nasal group

Answer 7

Nasalis Procerus Depressor septi nasi

Question 8

Talk about the nasalis

Answer 8

Largest of the nasal group Split in two parts - transverse and alar Transverse compresses nares, alar opens them

Question 9

Action of the procerus?

Answer 9

Most superior

Pulls eyebrows down

Question 10

Action of the depressor septi nasi?

Answer 10

Pulls nose inferiorly, opening nares

Question 11

Function of the orbicularis orbis?

Answer 11

Purses lips

Question 12

Function of the buccinator?

Answer 12

Pulls cheeks inwards against teeth, preventing accumulation of food here

Question 13

If the facial nerve is damaged and the person smiles, which side is affected depending on how the smile appears?

Answer 13

Tissues around mouth and cheeks sag Drawn across to opposite side to that affected while smiling

Question 14

What are the muscles of mastication innervated by?

Answer 14

Mandibular nerve,(V3) a branch of the trigeminal nerve

Question 15

Which pharyngeal arch are the muscles of mastication derived from?

Answer 15

1st pharyngeal arch

Question 16

Name the muscles of mastication

Answer 16

Masseter Temporalis Medial pterygoid Lateral pterygoid

Question 17

Which muscles raise the mandible?

Answer 17

Masseter/ Temporalis/ Medial pterygoid

Question 18

Action of the temporalis?

Answer 18

Elevates mandible Retracts mandible, pulling jaw posteriorly

Question 19

Action of the lateral pterygoid?

Answer 19

Protracts mandible, pushing jaw forwards Moves jaw from side to side

Question 20

Which nerve supplies the occipitofrontalis muscle?

Answer 20

Facial nerve

Question 21

Where can the facial nerve often be compressed to give Bell’s Palsy?

Answer 21

Near its exit from the cranium at the stylomastoid foramen

Question 22

Which nerve passes through the parotid gland?

Answer 22

Facial nerve

Question 23

How can you tell the difference between a stroke and Bell’s palsy?

Answer 23

Bell’s palsy - all muscles of facial expression are paralysed on one side

Stroke - frontal sparing. Occipitofrontalis and Orbicularis oculi are not paralysed due to their bilateral innervation

Question 24

Which pharyngeal arch are the facial muscles derived from?

Answer 24

Second

Question 25

Triangularis

Answer 25

Pulls down the corners of the mouth, as in sadness

Question 26

Temporalis

Answer 26

Closes the jaw

Question 27

Frontalis

Answer 27

Raises the eyebrows

Question 28

Zygomaticus smiling muscle Raises the corner of the mouth

Answer 28

smiling muscle Raises the corner of the mouth

Question 29

Corrugator

Answer 29

Draws the eyebrows inferiorly and medially, frowning.

Question 30

Orbicularis occuli

Answer 30

A band of muscles that surround the eye

Question 31

Orbicularis oris

Answer 31

kissing muscle

Question 32

Buccinator

Answer 32

muscles that compresses cheeks inward; whistling or kissing.

Question 33

Risorius

Answer 33

laughter

Question 34

Masseter

Answer 34

Closes the jaw

Question 35

Triangularis

Answer 35

Pulls down the corners of the mouth, as in sadness

Question 36

Depressor labii

Answer 36

depress lower lip