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oral cavity - BDS 1 > muscles of mastication :) > Flashcards

muscles of mastication :) Flashcards

1
Q

how is the mandible connected to the skull

A

synovial joints

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2
Q

what is the zygomatic arch or

A

attachment for masseter

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3
Q

parts of the mandible

A 
body
ramus
angle
coronoid process
condylar process (head and neck)
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4
Q

what hole is in the body of the mandible

A

mental foramen

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5
Q

what is the coronoid process for

A

site of attachment to temporalis

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6
Q

what is the temporomandibular joint made from

A

underside of temporal bone

head of condyle

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7
Q

what are main parts of the temporal bone that relates to the TMJ

A

concave glenoid cavity

convex articular eminance

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8
Q

when is the joint stable

A

when the condyle is in the glenoid

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9
Q

when is the joint unstable

A

when the condyl is on the articular eminence

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10
Q

how would you depress the mandible

A

condyle needs to move out of the genie cavity

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11
Q

TMJ movments

A

rotation

sliding

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12
Q

how does sliding movements occir

A

head of condyle moves from glenoid cavity to articular eminance

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13
Q

how does rotation occur in the TMJ

A

through axis of condyle

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14
Q

what are the TMJ surfaces covered by

A

fibrocartilage (Articular disks)

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15
Q

how is the joint separated into two cavites

A

by articular disk

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16
Q

what is the articular disk attached to

A

lateral pterygoid

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17
Q

function of articular disc

A 
attaches lateral pterygoid to posterior aspect of joint
stablises joint (pulled forward to pack space when condyle on articular eminence)
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18
Q

is the articular disc essential

A

no

joint will still fuction

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19
Q

what causes clicking sound of the joint

A

disc snaps into position rather than sliding

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20
Q

lateral pterygoid

A

divided into 2 heads (attach)
upper head to disc
lower head to neck of condyle

originates from lateral side of pterygoid plate

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21
Q

what is the lateral pterygoid involved in

A

protrusion of mandible
pulls on neck of condyl out of GC
upper head contracts and pulls AD onto AE

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22
Q

main ligament of TMJ

A

temporomandibular ligament

prevents lateral displacement

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23
Q

accessory ligaments of TMJ

A

stylomandibular

sphenomandibular

24
Q

what do the accessory ligaments do

A

define range of moment of TMJ

perceive pain

25
Q

how are the right and left TMJs connected

A

by mandible

26
Q

how many muscles in mastication

A

4 pairs

27
Q

what are the superficial muscles of mastication

A

masseter

temporalis

28
Q

what are the deep muscles of mastication

A

medial and lateral pterygoid

29
Q

what are the muscles of mastication supplied by

A

motor branches of trigeminal v3

30
Q

what are other muscles involved in movement of mandible

A

suprahyoid

infrahyoid

31
Q

temporalis

A

fan shaped

fibres all come together at same place to form tendon

32
Q

what is temporals attached to

A

lateral aspect of skull

coronoid process of mandible

33
Q

where does temporals inser

A

anterior border of rams to retromolar fossa

34
Q

what does temporalis do

A

elevator and retractor of mandible

35
Q

what happens if dentures extend into retromolar fossa

A

denture displacement

36
Q

masseter function and attatchments

A

elevator
zygomatic arch
along lateral aspect of mandibular ramus

37
Q

what is the lateral pterygoid plate for

A

site of attachment for lateral/medial pterygoid muscles

38
Q

lateral pteryoid function and attachments

A

protrudes mandible

lateral side of pterygoid plate and neck of condyl

39
Q

medial pterygoid function and attachemnts

A

elevator

medial side of lateral pteryhoid plate and inner aspect of angle of mandible

40
Q

what muscles elevate the mandible

A

temporalis
masseter
medial pterygoid

41
Q

what retracts the mandible

A

temporalis

42
Q

what protrudes the mandible

A

lateral pterygoids

43
Q

what can the supra hyoid muscles do

A

pull down on the mandible by contraction

44
Q

what do buccinator do

A

push food back into OC

45
Q

what does obicularis oris do

A

shuts the mouth

46
Q

what is lateral excursion

A

mandible swings side to side

47
Q

how does lateral excursion occur

A

when mandible protrudes, lateral pterygoid of other side deviates
opposite condyle moved slightly back by temporals

48
Q

what way can the TMJ dislocate

A

anterioally

49
Q

what prevents other forms of TMJ dislocation

A

bony ligamentous constraints

50
Q

how does dislocation of TMJ occur

A

condyle overrides articular eminence

51
Q

how to reset TMJ

A

downwards backwards pressure on molars

muscle relaxants if muscles gone into spasm

52
Q

what is required for incision

A

mandible suppressed for size of object

mandible protruded so incised edges meet

53
Q

what is required for mastication

A

depressed for food to get between molars

deviated laterally to bring molars into cusp contact

54
Q

range of movemtn

A

extreme when yawning

speech

55
Q

what is most TMJ disfunction due to

A

over closing and grinding

TMJ relies on proprioception from receptors and lateralpterygoid (muscle of mastication )

oral cavity - BDS 1 (66 decks)

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