Muscles of Mastication

Question 1

4 True Muscles of Mastication

Answer 1

1. Medial Pterygoid
2. Lateral Pterygoid
3. Temporalis
4. Masseter

Question 2

Nerve innervation of the muscles of mastication

Answer 2

Trigeminal

Question 3

Origin of Medial Pterygoid

Answer 3

Medial surface of the lateral pterygoid plate and pterygoid fossa

Question 4

Insertion of Medial Pterygoid

Answer 4

Medial surface of the ramus and angle of mandible, on the interior surface

Question 5

Action of Medial Pterygoid

Answer 5

Elevate and laterally deviate

Question 6

Origin of Superior Head of Lateral Pterygoid

Answer 6

Infratemporal Crest (great wing of sphenoid bone)

Question 7

Origin of Inferior head of Lateral Pterygoid

Answer 7

Lateral surface of lateral pterygoid plate

Question 8

Insertion of Lateral Pterygoid

Answer 8

Articular disc of TMJ and neck of mandibular condyle

Question 9

Action of Lateral Pterygoid

Answer 9

Can actively depress the mandible, the only muscle of mastication that can do this

Question 10

Temporalis Origin/Insertion/Action

Answer 10

O: Temporal Line of the Temporal Fossa
I: Coronoid process and anterior border of mandibular ramus
A: Elevate the mandible, retract mandible

Question 11

Superfical Part of Masseter O/I/A

Answer 11

O: Zygomatic process of maxilla and anterior 2/3 of inferior border of the zygomatic arch
I: Angle and lower lateral ramus of mandible
A: Elevate mandible, centric occlusion, protrusion

Question 12

Deep Part of Masseter O/I/A

Answer 12

O: Inner surface of posterior 1/3 of zygomatic arch
I: Superior part of mandibular ramus and lateral surface of coronoid process
A: Retract the jaw when it has been protruded

Question 13

Accessory muscle of mastication

Answer 13

Buccinator

Question 14

Action and Innervation of Buccinator

Answer 14

A: Compresses cheek and manages food bolus
Innervation: CNVII (Facial)

Question 15

Lateral Boundary of Pterygomandibular Space

Answer 15

Medial surface of mandibular ramus

Question 16

Medial Boundary of Pterygomandibular Space

Answer 16

Lateral surface of medial pterygoid

Question 17

Superior Boundary of Pterygomandibular Space

Answer 17

Lateral Pterygoid

Question 18

Inferior Boundary of Pterygomandibular Space

Answer 18

Insertion of medial pterygoid

Question 19

Contents of Pterygomandibular Space

Answer 19

1. Lingual Nerve

2. Inferior alveolar nerve and artery

Question 20

Innervation of Muscles of Facial Expression

Answer 20

Derived from 2nd branchial arch, facial nerve (CNVII)

Question 21

9 Groups of 2

Answer 21

1. Round
2. Nose
3. Zygomatic bone
4. Lip Elevators
5. Angle of the mouth
6. Lower Lip
7. Cheek
8. Top
9. Exceptions

Question 22

2 Round Landmarks

Answer 22

Orbicular Oculi

Orbicularis Oris

Question 23

Orbicular Oculi

Answer 23

1. Surrounds Orbit

2. Closes the eye

Question 24

Orbicular Oris

Answer 24

1. Surrounds the mouth

2. Closes the mouth/moves the lips

Question 25

2 with the Nose

Answer 25

1. Procerus | 2. Nasalis

Question 26

Procerus

Answer 26

1. Superficial 2. Midline, above bridge of nose 3. Involved in transverse wrinkling of skin btwn the eyes

Question 27

Nasalis

Answer 27

Transversely Oriented | Compression and dilation of the nostril

Question 28

2 From the Zygomatic Bone

Answer 28

1. Zygomaticus Major | 2. Zygomaticus Minor

Question 29

Zygomaticus Major

Answer 29

Lateral and longer

Question 30

Zygomaticus Minor

Answer 30

More medial

Question 31

2 Lip Elevators

Answer 31

1. Levator Labii Superioris | 2. Levator Labii Superioris alaeque Nasi

Question 32

Levator Labii Superiors

Answer 32

Inserts into lip itself

Question 33

Levator Labii Superioris Alaeque Nasi

Answer 33

To medial Campi of the eye | Causes nostrils to flare out

Question 34

2 at the angle of the mouth

Answer 34

1. Levator Anguli Oris | 2. Depressor Anguli Oris

Question 35

Levator Anguli Oris

Answer 35

1. Elevate the angle of the mouth | 2. Smiles

Question 36

Depressor Anglui Oris

Answer 36

1. Depress the angle of the mouth | 2. Frowns

Question 37

2 With the lower lip

Answer 37

1. Depressor Labii Inferioris | 2. Mentalis

Question 38

Depressor Labii Inferioris

Answer 38

Depresses lower lip

Question 39

Mentalis

Answer 39

Wrinkles the skin on chin | Pout and frown

Question 40

2 With the Cheek

Answer 40

1. Buccinator | 2. Risorius

Question 41

Buccinator

Answer 41

Compression of cheek

Question 42

Risorius

Answer 42

Moves angle of mouth laterally

Question 43

2 On Top

Answer 43

1. Frontalis | 2. Occipitalis

Question 44

Frontalis (where is it and what it does)

Answer 44

Covers frontal part of bone, goes to tendon, then back to occiptal bone Raising eyebrow, skin on forehead

Question 45

2 Exceptions

Answer 45

1. Platysma | 2. Corrugator Supercili

Question 46

Platysma

Answer 46

Covers neck, wrinkle skin over neck

Question 47

Corrugator Supercilli

Answer 47

Draws eyebrow down and medially when frowning

Question 48

General Innervation of the Face

Answer 48

``` Muscles = CN7 Skin = CN5 ```

Question 49

Trigeminal Nerve (CNV) breakdown in the Face

Answer 49

1. Ophthalmic 2. Maxillary 3. Mandibular

Question 50

Ophthalmic Nerve in the face

Answer 50

1. Forhead and around eye/nose 2. Supra orbital, supratrochlear, palpebral branch of lacrimal, infratrochlear, external nasal branch of anterior ethmoidal

Question 51

Maxillary Nerve in the face

Answer 51

Infra orbital, zygomaticofacial, zygomaticotemporal

Question 52

Mandibular Nerve in the Face

Answer 52

Mental, buccal, auricotemporal nerves

Question 53

Arteries in the face

Answer 53

Facial | Superficial Temporal

Question 54

What do the Facial and Superficial Temporal artieries have in common

Answer 54

Both are branches off the external carotid artery

Question 55

Veins of the Face

Answer 55

Facial Superficial Temporal -same as the artery