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Oral Anatomy Muscles > Muscles of Mastication > Flashcards

Muscles of Mastication Flashcards

1
Q

What is an origin?

A

Attached to the least moveable structure

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2
Q

What is insertion?

A

Attached to the more moveable structure

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3
Q

What is action?

A

Movement accomplished by muscle contraction

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4
Q

How many muscles are involved in mastication?

A

4

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5
Q

What are the muscles involved in mastication?

A

Masseter, Temporalis, Medial Pterygoid, and Lateral Pterygoid

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6
Q

What nerve controls the muscles of mastication

A

V3

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7
Q

What does the nerve V3 used for in mastication?

A

Coordinat movement of teeth for mastication

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8
Q

What is mastication?

A

Where digestion starts

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9
Q

What is the process of mastication?

A

Ingestion of food and muscles coordinate to place food between opposing teeth

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10
Q

What is amylase?

A

An enzyme that starts digestion. (it breaks down the starches)

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11
Q

The muscle masseter is controlled by what nerve?

A

V3

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12
Q

What is the action of the masseter muscle?

A

Elevation of the mandible

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13
Q

How many parts are there to the masseter muscle?

A

2

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14
Q

What are the parts of the masseter muscle?

A

Superficial and Deep

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15
Q

The origin of the Superficial masseter is attached where?

A

Anterior 2/3; inferior zygoma

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16
Q

The origin of the deep masseter is attached where?

A

Posterior 1/3; medial of zygoma

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17
Q

The insterion of superficial masseter attaches where?

A

Lower 1/2 external surface of ramus, angle of mandible

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18
Q

The insertion of deep masseter attaches where?

A

Lower 1/2 of external ramus

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19
Q

Is the masseter a strong or weak muscle

A

Strong

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20
Q

The muscle Temporalis is controlled by what nerve?

A

V3

21
Q

The origin of the temporalis is where

A

Temporal fossa

22
Q

The insertion of the temporalis is where?

A

Coronoid process

23
Q

**Where do the fibers of the temporalis pass?

A

Medial to the zygomatic arch

24
Q

What is the action of the temporalis muscle?

A

Elevation of the mandible

25
Q

What bones are included in the temporal fossa?

A

Temporal, Parietal, Frontal, Spheniod

26
Q

Retrusion?

A

Like moving the mandible posterior

27
Q

Is the temporalis a powerful muscle?

A

NO

28
Q

The muscle Medial Pterygoid is controlled by what nerve?

A

V3

29
Q

What is the origin of the medial pterygoid muscle?

A

Medial of the lateral pterygoid pate

30
Q

Where is the insertion of the medial pterygoid muscle?

A

Medial of the mandibular angle

31
Q

What is the action of the medial pterygoid muscle?

A

Elevation of the mandible

32
Q

What muscle with the action of the masseter creates a supportive “sling” for the mandible?

A

Medial pterygoid muscle

33
Q

What is the origin of the inferior Lateral Pterygoid muscle?

A

Lateral of the lateral pterygoid plate

34
Q

How many portions of the Lateral pterygoid muscle are there

A

2

35
Q

What are the portions of the Lateral pterygoid muscle?

A

Inferior and Superior

36
Q

What muscle attaches to the greater wing of the Spheniod bone?

A

Lateral Pterygoid muscle

37
Q

What nerve controls the Lateral Pterygoid muscle?

A

V3

38
Q

What portion of the lateral pterygoid muscle is bigger?

A

Inferior

39
Q

What is the origin of the superior Lateral pterygoid muscle

A

Greater wing of the spheniod

40
Q

What is the insertion of the inferior lateral pterygoid muscle?

A

Anterior of Condyle neck

41
Q

What is the insertion of the superior lateral pterygoid muscle?

A

Some fibers to TMJ capsule

42
Q

What is the action of the lateral pterygoid muscle?

A
  • slight depression of mandible
  • protrusion of mandible
  • “shifting” of the mandible
43
Q

How many actions doe the lateral pterygoid muscle have?

A

3

44
Q

What is a minor action of the lateral pterygoid muscle?

A

Slight depression of mandible

45
Q

What action is the Lateral pterygoid muscle known for?

A

Protrusion of mandible

46
Q

When you have a bilateral contraction of the Lateral pterygoid muscle what happens?

A

“PROTRUSION”

You will get protrusion of the mandible

47
Q

When you have unilateral contraction of the lateral pterygoid muscle what happens?

A

“SHIFTING”

If you contract muscle on the right mandible moves left. If you contract muscle on the left mandible moves right

48
Q

What is hypertrophy?

A

Enlarge the volume of the cells in the muscle tissue

49
Q

When you enlarge the cells of muscle tissue what is it called?

A

Hypertrophy

Oral Anatomy Muscles (7 decks)

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