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Occlusion > Mastication Muscles > Flashcards

Mastication Muscles Flashcards

1
Q

what is “Basic Unit of Muscle Contraction” called?

A

Motor Unit or Fascicle

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2
Q

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

A

Muscle tone

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3
Q

Which muscle is the principle elevator of mandible?

A

Temporalis

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4
Q

Which muscle has large origin and small insertion?

A

Temporalis

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5
Q

Which muscle helps in retraction, positioning and clenching?

A

Temporalis

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6
Q

Which muscle is significant in positioning muscle

A

Temporalis

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7
Q

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

A

Temporalis

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8
Q

Contraction of entire of which muscle produces elevation?

A

Temporalis

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9
Q

Which fibers of temporalis are almost vertical and elevates mandible?

A

Anterior Fibers

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10
Q

which fibers of temporalis elevate and slightly retrude mandible?

A

Middle Fibers

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11
Q

which fibers of temporalis causes retrusion?

A

Posterior Fibers

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12
Q

Which muscle elevates the jaw and clenches the teeth?

A

Masseter

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13
Q

Which muscle is the primary muscle for chewing force?

A

Masseter

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14
Q

Which portion of masseter helps in protrusion?

A

Superficial portion

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15
Q

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

A

Deep portion

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16
Q

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

A

Lateral pterygoid muscle

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17
Q

What is the only muscle to insert into TMJ Capsule?

A

Lateral Pterygoid muscle

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18
Q

Which muscle is the most important indicator of occlusal harmony?

A

Lateral Pterygoid muscle

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19
Q

Which head of Lateral Pterygoid muscle is active in protrusion?

A

Inferior head

20
Q

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

A

Inferior head of Lateral Pterygoid muscle

21
Q

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

A

Non-working

22
Q

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

A

True

23
Q

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

A

superior head of Lateral Pterygoid muscle

24
Q

What is the insertuin of superior head of Lateral Pterygoid muscle

A

Inserts on the TMJ Capsule and some fibers into the Disc

25
Q

Which muscle is inactive during opening but highly active during Closure

A

superior head of Lateral Pterygoid muscle

26
Q

Which msucle is highly active during closure?

A

superior head of Lateral Pterygoid muscle

27
Q

Which muscle contracts while lenghtening?

A

superior head of Lateral Pterygoid muscle

28
Q

Which muscle is most susceptible to injury?

A

superior head of Lateral Pterygoid muscle

29
Q

Which muscle is the primarily an elevator of the mandible?

A

Medial pterygoid muscle

30
Q

Which muscle supports activity of the lateral pterygoid muscle?

A

Medial pterygoid muscle

31
Q

which muscle is highly active during rotary or protrusive movements.

A

Medial pterygoid muscle

32
Q

Name 4 suprahyoid muscles.

A
  • Geniohyoid
  • Mylohyoid
  • Digastric
  • Stylohyoid
33
Q

Which muscle raises the floor of the mouth?

A

Mylohyoid

34
Q

What is the function of Geniohysoid?

A

Elevates the Hyoid Bone and the Tongue

35
Q

What is the function of Mylohyoid?

A

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

36
Q

What is the function of Digastric?

A

Raises the Hyoid Bone and the Base of the Tongue

37
Q

What is the function of Stylogyoid?

A

Elevates the Hyoid Bone and the Base of the Tongue

38
Q

Name infrahyoid muscles.

A
  • Thyrohyoid
  • Sternothyroid
  • Omohyoid
  • Sternohyoid
39
Q

Function of infrahyoid muscles.

A

All act to fixate the Hyoid Bone.

40
Q

Which muscle initials the mandibular opening activity?

A

Inferior Head of Lateral Pterygoid

41
Q

Which muscles are active during elevation?

A

Medial Pterygoid, Anterior Temporalis and Masseter Muscles

42
Q

Which muscle relaxes during mandibular closing?

A

Suprahyoid Muscles

43
Q

Which termporalis muscles contract to aide positioning?

A

Posterior and Middle Temporalis Muscles

44
Q

Which muscle can add power in centric?

A

Masseter and temporalis

45
Q

Which muscles are power muscles?

A

Masseter and temporalis

46
Q

3 phase chewing cycle:

A

•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

Occlusion (2 decks)

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