Facial Muscles and Muscles of Mastication Flashcards Preview

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Flashcards in Facial Muscles and Muscles of Mastication Deck (28):
0

Which pharyngeal arch are the facial muscles derived from?

Second

1

What do the facial muscles attach to in general?

Originate from bone or fascia Insert into skin Located in subcutaneous tissue

2

What are the facial muscles innervated by?

Facial nerve

3

General movements of the orbital group?

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

4

Name the muscles of the orbital group

Orbicularis oculi

Corrugator supercillii

5

Movements of the orbiculares oculi?

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

6

Actions of the corrugator supercillii?

Draws eyebrows together

7

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

Smaller

Posterior to the OO

Inserts into the skin of the eyebrow

8

Damage to the facial nerve results in orbitals beings paralysed. What can this cause?

Eye cannot close, cornea dries out, exposure keratitis Lower lid droops - 'ectropion' - lacrimal fluid pools in lower lid and isn't spread across surface of the eye. Failure to remove debris so get ulceration of the corneal surface

9

How to test for facial nerve palsy?

Raise eyebrows Close eyes

10

Name the facial muscles of the nasal group

Nasalis Procerus Depressor septi nasi

11

Talk about the nasalis

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

12

Action of the procerus?

Most superior

Pulls eyebrows down

13

Action of the depressor septi nasi?

Pulls nose inferiorly, opening nares

14

Function of the orbicularis orbis?

Purses lips

15

Function of the buccinator?

Pulls cheeks inwards against teeth, preventing accumulation of food here

16

Name the other oral muscles

Lower group - depressor anguli oris, depressor labii inferioris, mentalis Upper group - risorius, zygomaticus major and minor, levator labii superioris, levator labii superiors alaeque nasi, levator anguli oris

17

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

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

18

What are the muscles of mastication innervated by?

Mandibular nerve, a branch of the trigeminal nerve

19

Which pharyngeal arch are the muscles of mastication derived from?

1st pharyngeal arch

20

Name the muscles of mastication

Masseter Temporalis Medial pterygoid Lateral pterygoid

21

Which muscles raise the mandible?

Masseter Temporalis Medial pterygoid

22

Action of the temporalis?

Elevates mandible Retracts mandible, pulling jaw posteriorly

23

Action of the lateral pterygoid?

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

24

Which nerve supplies the occipitofrontalis muscle?

Facial nerve

25

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

Near its exit from the cranium at the stylomastoid foramen

26

Which nerve passes through the parotid gland?

Facial nerve

27

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

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