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Neurocranial Anatomy > Muscles of Mastication > Flashcards

Muscles of Mastication Flashcards

1
Q

4 True Muscles of Mastication

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

Nerve innervation of the muscles of mastication

A

Trigeminal

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3
Q

Origin of Medial Pterygoid

A

Medial surface of the lateral pterygoid plate and pterygoid fossa

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4
Q

Insertion of Medial Pterygoid

A

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

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5
Q

Action of Medial Pterygoid

A

Elevate and laterally deviate

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6
Q

Origin of Superior Head of Lateral Pterygoid

A

Infratemporal Crest (great wing of sphenoid bone)

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7
Q

Origin of Inferior head of Lateral Pterygoid

A

Lateral surface of lateral pterygoid plate

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8
Q

Insertion of Lateral Pterygoid

A

Articular disc of TMJ and neck of mandibular condyle

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9
Q

Action of Lateral Pterygoid

A

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

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10
Q

Temporalis Origin/Insertion/Action

A

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

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11
Q

Superfical Part of Masseter O/I/A

A

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

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12
Q

Deep Part of Masseter O/I/A

A

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

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13
Q

Accessory muscle of mastication

A

Buccinator

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14
Q

Action and Innervation of Buccinator

A

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

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15
Q

Lateral Boundary of Pterygomandibular Space

A

Medial surface of mandibular ramus

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16
Q

Medial Boundary of Pterygomandibular Space

A

Lateral surface of medial pterygoid

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17
Q

Superior Boundary of Pterygomandibular Space

A

Lateral Pterygoid

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18
Q

Inferior Boundary of Pterygomandibular Space

A

Insertion of medial pterygoid

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19
Q

Contents of Pterygomandibular Space

A
  1. Lingual Nerve

2. Inferior alveolar nerve and artery

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20
Q

Innervation of Muscles of Facial Expression

A

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

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21
Q

9 Groups of 2

A
  1. Round
  2. Nose
  3. Zygomatic bone
  4. Lip Elevators
  5. Angle of the mouth
  6. Lower Lip
  7. Cheek
  8. Top
  9. Exceptions
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22
Q

2 Round Landmarks

A

Orbicular Oculi

Orbicularis Oris

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23
Q

Orbicular Oculi

A
  1. Surrounds Orbit

2. Closes the eye

24
Q

Orbicular Oris

A
  1. Surrounds the mouth

2. Closes the mouth/moves the lips

25
Q

2 with the Nose

A
  1. Procerus

2. Nasalis

26
Q

Procerus

A
  1. Superficial
  2. Midline, above bridge of nose
  3. Involved in transverse wrinkling of skin btwn the eyes
27
Q

Nasalis

A

Transversely Oriented

Compression and dilation of the nostril

28
Q

2 From the Zygomatic Bone

A
  1. Zygomaticus Major

2. Zygomaticus Minor

29
Q

Zygomaticus Major

A

Lateral and longer

30
Q

Zygomaticus Minor

A

More medial

31
Q

2 Lip Elevators

A
  1. Levator Labii Superioris

2. Levator Labii Superioris alaeque Nasi

32
Q

Levator Labii Superiors

A

Inserts into lip itself

33
Q

Levator Labii Superioris Alaeque Nasi

A

To medial Campi of the eye

Causes nostrils to flare out

34
Q

2 at the angle of the mouth

A
  1. Levator Anguli Oris

2. Depressor Anguli Oris

35
Q

Levator Anguli Oris

A
  1. Elevate the angle of the mouth

2. Smiles

36
Q

Depressor Anglui Oris

A
  1. Depress the angle of the mouth

2. Frowns

37
Q

2 With the lower lip

A
  1. Depressor Labii Inferioris

2. Mentalis

38
Q

Depressor Labii Inferioris

A

Depresses lower lip

39
Q

Mentalis

A

Wrinkles the skin on chin

Pout and frown

40
Q

2 With the Cheek

A
  1. Buccinator

2. Risorius

41
Q

Buccinator

A

Compression of cheek

42
Q

Risorius

A

Moves angle of mouth laterally

43
Q

2 On Top

A
  1. Frontalis

2. Occipitalis

44
Q

Frontalis (where is it and what it does)

A

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

45
Q

2 Exceptions

A
  1. Platysma

2. Corrugator Supercili

46
Q

Platysma

A

Covers neck, wrinkle skin over neck

47
Q

Corrugator Supercilli

A

Draws eyebrow down and medially when frowning

48
Q

General Innervation of the Face

A 
Muscles = CN7
Skin = CN5
49
Q

Trigeminal Nerve (CNV) breakdown in the Face

A
  1. Ophthalmic
  2. Maxillary
  3. Mandibular
50
Q

Ophthalmic Nerve in the face

A
  1. Forhead and around eye/nose
  2. Supra orbital, supratrochlear, palpebral branch of lacrimal, infratrochlear, external nasal branch of anterior ethmoidal
51
Q

Maxillary Nerve in the face

A

Infra orbital, zygomaticofacial, zygomaticotemporal

52
Q

Mandibular Nerve in the Face

A

Mental, buccal, auricotemporal nerves

53
Q

Arteries in the face

A

Facial

Superficial Temporal

54
Q

What do the Facial and Superficial Temporal artieries have in common

A

Both are branches off the external carotid artery

55
Q

Veins of the Face

A

Facial
Superficial Temporal
-same as the artery

Neurocranial Anatomy (10 decks)

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