Lecture 9: Nose & Sinus Muscles of Facial Expression

Question 1

External Nose

Answer 1

-projects outwards allowing air to enter the nasal cavity
-made up of bone and cartilage

Question 1

Nasal Cavity Purpose

Answer 1

1. Humidify, warm & filter air
2. Facilitate drainage of the paranasal sinuses
3. Secrete mucus

Question 2

which bone(s) does the external nose begin at

Answer 2

nasal

Question 3

Bones in the nasal cavity

Answer 3

-frontal
-nasal
-maxillary
-vomer
-palatine
-sphenoid
-ethmoid

Question 4

medial wall of the nasal cavity

Answer 4

nasal septum (bone and cartilage)

Question 5

What forms the medial wall

Answer 5

ethmoid bone, septal cartilage and vomer bone (cartilage not seen anteriorly)

Question 6

What composes the lateral walls of the nasal cavity

Answer 6

-superior nasal concha and meatus
-middle nasal concha and meatus
-inferior nasal concha and meatus

Question 7

what covers the lateral walls

Answer 7

musous membrane

Question 8

which concha is its own cranial bone

Answer 8

-inferior nasal concha

Question 9

functions of the nasal concha

Answer 9

Increase surface area in the nasal cavity

-humidify air
-filter air
-warm up the air

Question 10

nasal cavity borders

Answer 10

-roof
-Floor (palate)
-medial wall (nasal septum)

Question 11

what is the roof of the nasal cavity made of

Answer 11

-cribriform plate
-nasal bone
-frontal bone
-sphenoid bone
*cant see cribriform plate anteriorly

Question 12

What is the floor of the nasal cavity made of (also the roof of the oral cavity)

Answer 12

palatine and maxillary bone

Question 13

Cartilaeg of the external nose

Answer 13

1. Lateral nasal cartilage
2. Major Alar cartilage
3. Minor Alar Cartilage

Question 14

Paranasal sinuses

Answer 14

-cavities found in the skull
-lined with respiratory mucosa and secrete mucous

Question 15

which bones have paranasal sinuses

Answer 15

-ethmoid, frontal, maxillary, and sphenoid

Question 16

Function of paranasalsinuses

Answer 16

1. lighten the weight of the skull
2. humidify/heat/filter inspires air
3. secrete mucus

Question 17

purpose of nasal meatuses

Answer 17

recieve drainage from the paranasal sinuses

Question 18

the superior meatus drains the

Answer 18

sphenoid, and posterior ethmoid sinuses

Question 19

the middle meatus drains

Answer 19

the frontal, anterior ethmoid and maxillary sinuses

Question 20

the nasal cavity extends to the _____, where the mucus will then be swallowed

Answer 20

nasopharynx

Question 21

which paranasal sinus is the largest

Answer 21

maxillary

Question 22

innervation of the paranasal sinuses

Answer 22

opthalmic and maxillary branches of the trigeminal nerve

Question 23

muscles of bones originate and insert from where

Answer 23

originate from facial bones or adjacent muscles
insert into the skin

Question 24

superficial facial muscles are innervated by

Answer 24

facial nerve (CN VII)

Question 25

function of facial muscles

Answer 25

-act as sphincters and dilators
-alter facial expressions

Question 26

muscles of facial expression

Answer 26

-frontalis
-corrugator supercilii
-buccinator
-platysma
-orbicularis oris
-zygomaticus
-orbicularis oculi

Question 27

Frontalis

Answer 27

-epicranial group
-draws the scalp back, raising eyebrows

Question 28

facial expression of frontalis

Answer 28

surprise

Question 29

orbicularis oculi

Answer 29

orbital group
3 parts
1. orbital part (outer - eyesocket)
2. Palpebral part (inner)
3. Lacrimal part: (innermost/medial)

Question 30

functions of the orbicularis oculi: orbital part

Answer 30

tightly closing the eye (winking)

Question 31

functions of the orbicularis oculi:
Palpebral part

Answer 31

loosely closing the eye (blinking)

Question 32

functions of the orbicularis oculi: lacrimal part

Answer 32

compress lacrimal sac (tears) by drawing eyelids medially

Question 33

Corrugator supercilii

Answer 33

-orbital group
-action: draw eyebrows together medially and inferiorly

Question 34

facial expression of corrugator supercilii

Answer 34

frowning

Question 35

orbicularis oculi

Answer 35

-oral group
-action: purses & protrudes lips

Question 36

Zygomaticus

Answer 36

-oral group
-action: pulls corners of mouth up drawing it laterally
**minor and major

Question 37

facial expression using zygomaticus

Answer 37

smiling

Question 38

Buccinator

Answer 38

-oral group
-action: pull the cheeks inward against the teeth

Question 39

which muscle does now allow for food to get stuck between check and teeth

Answer 39

buccinator

Question 40

facial expression of buccinator

Answer 40

blowing

Question 41

Platysma

Answer 41

-neck group
-action: pull corners of mouth down

Question 42

facial expression using platysma

Answer 42

yikes

Question 43

which pathway does CN VII take to innervate muscles of facial expression

Answer 43

intracranial pathway via internal acoustic meatus, then facial canal, then medial wall of middle ear and out stylomastoid formen

Question 44

5 branches of facial nerve

Answer 44

1. Temporal branches
2. Zygomatic branches
3. Buccal branches
4. Marginal mandibular branch
5. Cervical branches

Question 45

which muscle(s) does the temporal branch innervate

Answer 45

-orbicularis oculi (upper half)
-corrugator supercilii
-frontalis

Question 46

which muscle does the zygomatic branch innervate

Answer 46

orbicularis oculi (lower half)

Question 47

which muscles do buccal branches innervate

Answer 47

Orbicularis oris, zygomaticus and buccinator

Question 48

which muscle does the cervical branch innervate

Answer 48

Platysma