Mastication Muscles

Question 1

what is “Basic Unit of Muscle Contraction” called?

Answer 1

Motor Unit or Fascicle

Question 2

is muscle tone important in maintaining posture/interocclusal rest space?

Answer 2

Muscle tone

Question 3

Which muscle is the principle elevator of mandible?

Answer 3

Temporalis

Question 4

Which muscle has large origin and small insertion?

Answer 4

Temporalis

Question 5

Which muscle helps in retraction, positioning and clenching?

Answer 5

Temporalis

Question 6

Which muscle is significant in positioning muscle

Answer 6

Temporalis

Question 7

which muscle contracts by one or more of three sections or all at once?

Answer 7

Temporalis

Question 8

Contraction of entire of which muscle produces elevation?

Answer 8

Temporalis

Question 9

Which fibers of temporalis are almost vertical and elevates mandible?

Answer 9

Anterior Fibers

Question 10

which fibers of temporalis elevate and slightly retrude mandible?

Answer 10

Middle Fibers

Question 11

which fibers of temporalis causes retrusion?

Answer 11

Posterior Fibers

Question 12

Which muscle elevates the jaw and clenches the teeth?

Answer 12

Masseter

Question 13

Which muscle is the primary muscle for chewing force?

Answer 13

Masseter

Question 14

Which portion of masseter helps in protrusion?

Answer 14

Superficial portion

Question 15

Which portion of masseter stabilizes the condyle when biting on incisors?

Answer 15

Deep portion

Question 16

Which muscle is highly active in opening/closing and excursive movements?

Answer 16

Lateral pterygoid muscle

Question 17

What is the only muscle to insert into TMJ Capsule?

Answer 17

Lateral Pterygoid muscle

Question 18

Which muscle is the most important indicator of occlusal harmony?

Answer 18

Lateral Pterygoid muscle

Question 19

Which head of Lateral Pterygoid muscle is active in protrusion?

Answer 19

Inferior head

Question 20

which muscle In concert with depressors will cause Working and Non Working movements?

Answer 20

Inferior head of Lateral Pterygoid muscle

Question 21

Active Side of muscle contraction is Non Working or working in inferior head of Lateral Pterygoid muscle?

Answer 21

Non-working

Question 22

True of False: “ superior head is 1/3 as large as inferior head.”

Answer 22

True

Question 23

which muscle inserts on the TMJ Capsule and some fibers into the Disc?

Answer 23

superior head of Lateral Pterygoid muscle

Question 24

What is the insertuin of superior head of Lateral Pterygoid muscle

Answer 24

Inserts on the TMJ Capsule and some fibers into the Disc

Question 25

Which muscle is inactive during opening but highly active during Closure

Answer 25

superior head of Lateral Pterygoid muscle

Question 26

Which msucle is highly active during closure?

Answer 26

superior head of Lateral Pterygoid muscle

Question 27

Which muscle contracts while lenghtening?

Answer 27

superior head of Lateral Pterygoid muscle

Question 28

Which muscle is most susceptible to injury?

Answer 28

superior head of Lateral Pterygoid muscle

Question 29

Which muscle is the primarily an elevator of the mandible?

Answer 29

Medial pterygoid muscle

Question 30

Which muscle supports activity of the lateral pterygoid muscle?

Answer 30

Medial pterygoid muscle

Question 31

which muscle is highly active during rotary or protrusive movements.

Answer 31

Medial pterygoid muscle

Question 32

Name 4 suprahyoid muscles.

Answer 32

- Geniohyoid - Mylohyoid - Digastric - Stylohyoid

Question 33

Which muscle raises the floor of the mouth?

Answer 33

Mylohyoid

Question 34

What is the function of Geniohysoid?

Answer 34

Elevates the Hyoid Bone and the Tongue

Question 35

What is the function of Mylohyoid?

Answer 35

Elevates the Hyoid Bone, Base of the Tongue and raises the Floor of the Mouth

Question 36

What is the function of Digastric?

Answer 36

Raises the Hyoid Bone and the Base of the Tongue

Question 37

What is the function of Stylogyoid?

Answer 37

Elevates the Hyoid Bone and the Base of the Tongue

Question 38

Name infrahyoid muscles.

Answer 38

* Thyrohyoid * Sternothyroid * Omohyoid * Sternohyoid

Question 39

Function of infrahyoid muscles.

Answer 39

All act to fixate the Hyoid Bone.

Question 40

Which muscle initials the mandibular opening activity?

Answer 40

Inferior Head of Lateral Pterygoid

Question 41

Which muscles are active during elevation?

Answer 41

Medial Pterygoid, Anterior Temporalis and Masseter Muscles

Question 42

Which muscle relaxes during mandibular closing?

Answer 42

Suprahyoid Muscles

Question 43

Which termporalis muscles contract to aide positioning?

Answer 43

Posterior and Middle Temporalis Muscles

Question 44

Which muscle can add power in centric?

Answer 44

Masseter and temporalis

Question 45

Which muscles are power muscles?

Answer 45

Masseter and temporalis

Question 46

3 phase chewing cycle:

Answer 46

•Closing Stroke: Mandible is brought Upward and Outward to come into initial contact with the food • Masticatory or Power Stroke: Mandible is brought further Upward and Medial until tooth to tooth contact is reached •Opening Stroke or Free Movement Phase: Very Little or No Force required. Mandible is lowered slow at first then faster to set up the next cycle