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3. HLTH 213 > Temporomandibular joint (TMJ) > Flashcards

Temporomandibular joint (TMJ) Flashcards

1
Q

temporomandibular joint: articulation btw

A

temporal bone:

  • articular process
  • mandibular fossa

mandible:
- condyloid process

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2
Q

TMJ joint: classify

A
  • synovial modified hinge
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3
Q

TMJ joint: function

A
  • chewing
  • talking
  • yawning
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4
Q

TMJ joint: consists of

A
  • fibrous capsule
  • ligs
  • articular surface + disc
  • muscles
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5
Q

TMJ joint: articular capsule + disc

A
  • loose
  • margins of articular area of temporal bone
  • neck of mandible

disc:

  • separates into sup/ inf compartments
  • compartments of synovial membrane
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6
Q

TMJ joint: name ligs and function

A
  • lateral: (strengthens TMJ)
  • stylomandibular lig (minimal support to joint)
  • sphenomandibular lig (passive support to mandible)
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7
Q

TMJ joint: which lig prevents post dislocation

A
  • lateral lig
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8
Q

lateral lig: from

A

reinforces around TMJ capsule in mandible

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9
Q

stylomandibular lig: from

A

styloid process to angle of mandible

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10
Q

sphenomandibular lig: from

A

sphenoid spine to lingula of mandibular foramen

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11
Q

TMJ joint: list movements

A
  • elevation
  • depression
  • retraction
  • protrusion
  • lateral deviation (L, R)
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12
Q

TMJ joint: describe movement

A
  • each condyle first rotates within disc
  • both condyle and disc slide forward down articular eminence
  • for jaw close: move in unison back into mandibular fossa
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13
Q

mm involved in: protrusion

A
  • lateral pterygoid (assisted by medial pterygoid)
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14
Q

mm involved in: retraction

A
  • post fibres of temporalis,

- deep part of masseter, glenohyoid and digastric

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15
Q

mm involved in: elevation

A
  • temporalis
  • masseter
  • medial pterygoid
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16
Q

mm involved in: depression

A
  • gravity

- digastric, glenohyoid, mylohyoid

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17
Q

mm involved in: mastication

A
  • masseter
  • temporalis
  • lateral pterygoid
  • medial pterygoid
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18
Q

mm involved in: suprahyoids

A
  • mylohyoid
  • geniohyoid
  • stylohyoid
  • digastric
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19
Q

mm involved in: infrahyoids

A
  • sternohyoid
  • omohyoid
  • sternothyroid
  • thyrohyoid
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20
Q

temporalis: origin

A
  • bony surfaces temporal fossa

- inf temporal line

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21
Q

temporalis: insertion

A
  • coronoid process

- ant margin or ramus and mandible

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22
Q

temporalis: action

A

vertical fibres:
- elevation, side to side

horizontal fibres:
- retraction

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23
Q

temporalis: function

A
  • powerful elevator of mandible
  • retraction
  • assists w side to side movement
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24
Q

temporalis: shape

A
  • fan shape
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25
Q

masseter: shape

A
  • quadrangular
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26
Q

superficial part -masseter: origin

A
  • maxillary process of zygomatic

- ant 2/3 zygomatic process maxilla

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27
Q

superficial part -masseter: insertion

A
  • lateral aspect of ramus of mandible
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28
Q

superficial part -masseter: action

A

elevation

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29
Q

deep part -masseter: origin

A
  • medial aspect of zygomatic arch

- post part of its inf margin

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30
Q

deep part -masseter: insertion

A
  • central and upper part of ramus of mandible

- as high as coronoid process

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31
Q

deep part -masseter: action

A

elevation

32
Q

deep head - medial pterygoid: shape

A

quadrangular

33
Q

deep head - medial pterygoid: origin

A
  • medial surface of lateral pterygoid plate/ process
34
Q

deep head - medial pterygoid: insertion

A
  • fibres pass down lateral

- post to common tendinous sling on medial side of ramus of mandible

35
Q

deep head - medial pterygoid: action

A

elevation assists lateral pterygoid in protrusion

36
Q

medial head - medial pterygoid: shape

A

quadrangular

37
Q

deep head - medial pterygoid: origin

A

maxillary process and pyramidal process of palatine bone

38
Q

deep head - medial pterygoid: insertion

A
  • fibres pass down lateral, post to common tendinous sling on medial side of ramus of mandible
39
Q

deep head - medial pterygoid: actino

A

elevation assists lateral pterygoid in protrusion

40
Q

sup head - lateral pterygoid: shape

A

triangular

41
Q

sup head - lateral pterygoid: origin

A
  • infratemporal surface

- infratemporal crest of greater wing of sphenoid

42
Q

sup head - lateral pterygoid: insertion

A
  • articular disc and fibrous capsule
43
Q

sup head - lateral pterygoid: action

A

protrusion coordinated movement of TMJ result in chewing

44
Q

inf head - lateral pterygoid: shape

A

triangular

45
Q

inf head - lateral pterygoid: origin

A
  • lateral surface of lateral pterygoid plate/ process
46
Q

inf head - lateral pterygoid: insertion

A

neck of mandible

47
Q

inf head - lateral pterygoid: action

A

protrusion coordinated movement of TMJ result in chewing

48
Q

innervation: masseter

A

trigeminal (CN V) mandibular division

- masseteric branch

49
Q

innervation: temporalis

A

CN V mandibular div - deep temporal nerves

50
Q

innervation: medial pterygoid

A

CN V mandibular div - medial pterygoid n

51
Q

innervation: lateral pterygoid

A

CN V mandibular div - lateral pterygoid n

52
Q

suprahyoid and infrahyoid mm: function

A
  • primarily used to raise/ depress hyoid bone and larynx

- indirectly help depress mandible: suddenly/ against resistance

53
Q

stylohyoid: origin

A

styloid process of temporal bone

54
Q

stylohyoid: insertion

A

body of hyoid

55
Q

stylohyoid: inn

A

facial (CN VII)

56
Q

mylohyoid: origin

A

mylohyoid line on mandible

57
Q

mylohyoid: insertion

A

body of hyoid, median raphe

58
Q

mylohyoid: inn

A

n to mylohyoid from mandibular div of CN V

59
Q

geniohyoid: origin

A

inf mental spine of mandible

60
Q

geniohyoid: insertion

A

body of hyoid

61
Q

geniohyoid: inn

A

ant rami of C1

62
Q

diagastric: origin - ant belly

A

diagastric fossa of mandible

63
Q

diagastric: origin - post belly

A

mastoid process of temporal bone

64
Q

diagastric: insertion

A

intermediate tendon (body of hyoid)

65
Q

diagastric: inn

A

CN VII

66
Q

TMJ: innervation branch

A

auriculotemporal n. from mandibular branch of trigeminal

67
Q

TMJ: auriculotemporal provides

A
  • general sensory fibres from skin over large area of temple
  • external ear
  • tympanic membrane
  • TMJ
  • delivers postganglionic parasymp fibres to parotid gland
68
Q

TMJ: signs and symptoms associated

A
  • pain travelling through face/ jaw/ neck
  • stiff jaw mm
  • limited movement/ locking of jaw
  • painful clicking/ popping of jaw
  • change in position of sup/ inf teeth
69
Q

TMJ: palpation

A
  • intraoral (in mouth)/ TMJ palpation

- intra auricular

70
Q

eg. Bruxism:

A
  • nocturnal grinding of teeth

- causes inflammation/ pain

71
Q

eg. ant disc displacement without reduction

A
  • lock jaw decreased ROM
  • ligs stretch, disc sits ant and doesn’t reduce back into mandibular fossa
  • difficulty opening mouth more than 2 finger width
72
Q

TMJ: dislocation

A

ant:
- large bites, excessive contraction of lateral pterygoid mm

post:
- uncommon due to protection of lateral lig

73
Q

TMJ: stylomandibular lig sprain

A
  • sharp to aching pain behind lower jaw and below ear

- bad bite or trauma

74
Q

TMJ: arthritis features

A
  • systemic disease like rheumatoid arthritis

- excessive use of TMJ

75
Q

TMJ: arthritis symptoms

A
  • crepitus (grating sound)
  • pain around ear
  • bit shift and decreased ROM
  • inability to chew

3. HLTH 213 (22 decks)

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