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CNS > [ANAT] MUSCLES OF MASTICATION > Flashcards

[ANAT] MUSCLES OF MASTICATION Flashcards

1
Q

4 Muscles of mastication

A

temporalis
masseter
lateral pterygoid
medial pterygoid

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2
Q

which nerve generally supplies all 4 muscles?

A

mandibular

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3
Q

which embryological structure are all 4 muscles developed from?

A

mesoderm of 1st pharyngeal arch

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4
Q

all 4 muscles act on

A

TMJ

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5
Q

temporalis lies in

A

temporal fossa

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6
Q

masseter overlies

A

ramus of mandible

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7
Q

medial & lateral pterygoids are content of

A

infratemporal fossa

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8
Q

origin of temporalis

A

floor of temporal fossa & deep surface of temporal fascia

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9
Q

insertion of temporalis

A

all of coronoid process except lateral surface
extends on anterior surface of ramus down till last molar

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10
Q

origin of superficial head of masseter

A

anterior 2/3 of zygomatic arch

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11
Q

origin of deep head of masseter

A

posterior 1/3 of zygomatic arch

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12
Q

insertion of masseter

A

ramus (lateral surface)

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13
Q

origin of upper head lateral pterygoid

A

infratemporal crest & greater wing of sphenoid

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14
Q

origin of lower head of lateral pterygoid

A

lateral aspect of lateral pterygoid plate

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15
Q

insertion of lateral pterygoid

A

fovea
capsule of TMJ
articular disk of TMJ

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16
Q

origin of superficial head medial pterygoid

A

turberosity of maxilla

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17
Q

origin of deep head of medial pterygoid

A

medial aspect of lateral pterygoid plate

18
Q

insertion of medial pterygoid

A

angle of mandible (medial aspect)

19
Q

nerve supply of temporalis

A

2 deep temporal nerves
~from anterior division of mandibular nerve

20
Q

nerve supply of masseter

A

masseteric branch
~from anterior division of mandibular nerve

21
Q

nerve supply of lateral pterygoid

A

pterygoid branch
~from anterior division of mandibular nerve

22
Q

nerve supply of medial pterygoid

A

branch from trunk of mandibular nerve

23
Q

action of anterior vertical fibers of temporalis

A

elevation of mandible

24
Q

action of posterior horizontal fibers of temporalis

A

retraction of mandible

25
Q

action of deep vertical fibers of masseter

A

elevation of mandible

26
Q

action of superficial oblique fibers of masseter

A

protraction of mandible

27
Q

action of lateral pterygoid

A

depresses mandible–>opens mouth
protrudes mandible
side to side movement (for chewing)

28
Q

action of medial pterygoid

A

elevates mandible
protrudes mandible
side to side for chewing

29
Q

contraction of medial & lateral pterygoid causes

A

pushing of mandible to opposite side

30
Q

all muscles are supplied by anterior division of mandible EXCEPT

A

medial pterygoid

31
Q

all muscles cause protrusion of mandible EXCEPT

A

temporalis

32
Q

All muscles cause elevation of mandible EXCEPT

A

lateral pterygoid

33
Q

all muscles are inserted on inner side of ramus EXCEPT

34
Q

only retractor of mandible

A

temporalis

35
Q

only depressor of mandible

A

lateral pterygoid

36
Q

upper border relations of pterygoid

A

deep temporal nerve
masseteric nerve

37
Q

lower border relations of pterygoid

A

lingual nerve
inferior alveolar nerve+ vessels

38
Q

relations of pterygoid between 2 heads of

A

buccal nerve
maxillary artery

39
Q

superficial (lateral) relations of pterygoid (5)

A

1-ramus mandible
2-superficial head of medial pterygoid
3-tendon of temporalis
4-maxillary artery
5-pterygoid venous plexus

40
Q

deep (medial) relations of pterygoid (8)

A

1-deep head of medial pterygoid
2-tensor palati
3-mandibular trunk
4-otic ganglia
5-chorda tympani
6-middle meningeal artery
7-maxillary artery
8-spheno-mandibular ligament

CNS (29 decks)

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