(E2) 3 - Muscles of Mastication

Question 1

Define Incision

Answer 1

Question 2

Define Mastication

Answer 2

Question 3

Define Deglutition

Answer 3

Swallowing

Question 4

What are the 4 muscles of mastication?

Answer 4

• masseter
• temporalis
• lateral pterygoid
• medial pterygoid

Question 5

What innervates the muscles of mastication?

Answer 5

Question 6

Image of Jaw Movements

Answer 6

Question 7

Masseter: Superior Head/Layer
- fiber course
- attachments
- innervation

Answer 7

Question 8

Masseter: Middle Head/Layer
- attachments
- innervation

Answer 8

Question 9

Masseter: Deep Head/Layer
- fiber course
- attachments
- innervation

Answer 9

Question 10

Actions of Masseter Muscle

Answer 10

Question 11

_______ nerve, artery, and vein course superior to mandibular notch to enter deep surface of the masseter muscle.

Answer 11

Masseteric

Question 12

Where does the masseter muscle receive blood from? (3)

Answer 12

• masseteric artery
• transverse facial artery
• facial artery

Question 13

____ nerve, _____ artery and _____ are superficial to masseter muscle.

Answer 13

• facial nerve branches
• transverse facial artery
• parotid duct

Question 14

Mandibular attachment of ____ muscle is deep to masseter.

Answer 14

Temporalis

Question 15

Temporalis:
- fiber course
- attachments
- innervation

Answer 15

Question 16

What can be found superficial to the temporalis muscle? (7 things)

Answer 16

Question 17

Temporoparietal fascia is_______ fascia
Contains ________ muscles

Answer 17

• superficial
• auricular

Question 18

Temporal fascia is ________ fascia surrounding temporalis
Attaches to ____________

Answer 18

• deep
• superior temporal line

Question 19

Superficial temporal space is between ____ & _______

Answer 19

fascia & temporalis

Question 20

Deep temporal space is between ____ & _______

Answer 20

temporalis & skull

Question 21

Deep temporal nerves course adjacent to _________

Answer 21

deep temporal arteries

Question 22

Middle temporal artery is a branch from _____

Answer 22

superficial temporal artery

Question 23

Anterior and posterior deep temporal nerves branch from ____________.

Answer 23

anterior division of mandibular nerve.

Question 24

Anterior and posterior deep temporal nerves course deep to __________

Answer 24

temporalis

Question 25

Anterior deep temporal nerve may arise from common trunk with ____________ nerve and first pass superficially over superior head of ___________ before coursing deep to __________

Answer 25

- long buccal - lateral pterygoid - temporalis

Question 26

Anterior and posterior deep temporal arteries branch from 2nd part of ___________

Answer 26

maxillary artery

Question 27

Anterior and posterior deep temporal arteries course deep to ________

Answer 27

temporalis

Question 28

____________ branches from superficial temporal artery superior to root of zygomatic arch

Answer 28

Middle temporal artery

Question 29

Middle temporal artery courses deep to _________ and superficial to ___________

Answer 29

- temporal fascia - temporalis

Question 30

Actions of Temporalis

Answer 30

Question 31

What does the masticator compartment (space) contain?

Answer 31

Question 32

______ space is a subcompartment of the masticator compartment

Answer 32

Pterygomandibular space

Question 33

Pterygomandibular space is a physical space between ______ & __________

Answer 33

Question 34

_____ & __________ are both deep to the mandible, have 2 heads, and have their own same-named innervation

Answer 34

Medial and lateral pterygoids

Question 35

_________ pterygoid is more horizontal and superior

Answer 35

Lateral

Question 36

Medal Pterygoid Attachments

Answer 36

Question 37

Medial Pterygoid Actions and Innervation

Answer 37

Question 38

Lateral Pterygoid: Superior Head attachments

Answer 38

Question 39

Lateral Pterygoid: Inferior Head Attachments

Answer 39

Question 40

Actions and Innervation of Lateral Pterygoid

Answer 40

Question 41

What is the Pterygomasseteric sling?

Answer 41

Question 42

Pterygomasseteric sling: Obliquity of sling permits ____ when other half of the sling is contralateral activated

Answer 42

Shearing

Question 43

Right masseter and left medial pterygoid would result in lateral excursion to the _______ and a shearing effect

Answer 43

right

Question 44

Opening the mouth is done by the __________ muscles stabilizing the hyoid bone. The________ muscles and _________ head of the lateral pterygoid muscle then act synergistically to depress the mandible. The________ head of the lateral pterygoid is minimally activated at this time.

Answer 44

- infrahyoid - suprahyoid - inferior - superior

Question 45

Closing the mouth is done by what 3 muscles?

Answer 45

medial pterygoid, masseter and temporalis

Question 46

The posterior fibers of the________ that are oriented horizontally, retrude the mandible during closing the mouth.

Answer 46

temporalis

Question 47

The _________ is likely eccentrically activated during closing the mouth to control disc placement and retrusion force.

Answer 47

superior head of the lateral pterygoid

Question 48

Lateral excursion is performed by muscles on both sides of the head. Left lateral excursion is done by the_______ masseter and temporalis and______ pterygoid muscles.

Answer 48

- ipsilateral - contralateral

Question 49

Left lateral excursion is done by the____ masseter & _____ temporalis and _____ medial pterygoid & _____ lateral pterygoid.

Answer 49

- left - left - right - right

Question 50

Image - Stages of Mastication Cycle

Answer 50

( opening - the first phase is rotation, the second phase requires translation and rotation)