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Occlusion > 5 TMJ > Flashcards

5 TMJ Flashcards

1
Q

arcs of opening

A

1st arc: rotation

2nd arc: translation

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2
Q

ginglymoid and arthodial joint

A 
ginglymoid = rotation/hinging
arthodial = translation, gliding
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3
Q

mandibular condyle dimensions

A

greater mediolateral dimension than anteroposterior

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4
Q

mandibular condyle poles

A

medial pole is More prominent
lateral pole is Less prominent
intersect at anterior portion of f. magnum
extend medially and posteriorly

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5
Q

mandibular condyle articular surface

A

posterior surface has larger articular surface

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6
Q

articular (glenoid) fossa and eminence

A

of zygomatic arch of temporal bone
eminence = functioning
fossa = nonfunctioning, ant. to dividing petrytympanic fissure
mandibular fossa = large depression behind articular fossa

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7
Q

innervation

A

trigeminal CN V mandibular branch (III)

masseteric, Auriculotemporal, deep temporal

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8
Q

irrigation of TMJ

A

superficial temporal a.
internal maxillary a.
middle meningeal a.

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9
Q

colateral/discal ligament attachments

A

two short ligaments: medial/distal pole –> disc

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10
Q

colateral/discal ligament functions

A

maintain disc and mandibular condyle

prevent excessive rotation

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11
Q

capsular ligament/fibrous capsule attachments

A

superiorly to temporal bone around border of articular surfaces of mandibular fossa and articular eminence –> inferiorly to neck on condyle

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12
Q

capsular ligament/fibrous capsule functions

A

surrounds TMJ
keeps articular surfaces in contact
temporal and mandibular fossa remain in contact
produce synovial fluid

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13
Q

lateral ligament OOP attachments

A

outer oblique portion

lateral surfaces of zygomatic arch and articular eminence –> posterior surface of condyle neck

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14
Q

lateral ligament OOP functions

A

prevents excessive rotation in 1st arc of opening

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15
Q

lateral ligament IHP attachments

A

inner horizontal portion

outer surface of zygomatic arch and articular eminence –> lateral surface of disc or lateral pole

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16
Q

lateral ligament IHP functions

A

prevents posterior movement (of condyle into mandibular fossa)
assists/prevents straining of lateral pterygoid m.

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17
Q

sphenomandibular ligament attachments

A

sphenoidal/angular spine (sphenoid) –> lingula

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18
Q

sphenomandibular ligament functions

A

prevents excessive opening (a little)

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19
Q

stylomandibular ligament attachments

A

styloid process (temporal) –> posterior border of mandible

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20
Q

stylomandibular ligament functions

A

oblique orientation: prevents excessive protrusion

21
Q

masseter function

A

elevate mandible, close teeth together

22
Q

masseter origin

A

zygomatic arch (inferior and medial)

23
Q

masseter insertion

A

lateral surface of rami and angle of mandible

24
Q

masseter fibers

A

deep vertical and superficial oblique

two movements: elevation and protrusion

25
Q

temporalis function

A

elevate (teeth contact) and retrude mandible

26
Q

temporalis origin

A

temporal fossa on cranium

27
Q

temporalis insertion

A

coronoid process, anterior border of ramus, temporal crest

28
Q

temporalis fibers

A

anterior (vertical) E
middle (oblique) E & R
posterior (horizontal) R

29
Q

medial pterygoid function

A

elevate (teeth contact)

medial counterpart to masseter

30
Q

medial pterygoid origin

A

pterygoid fossa (sphenoid)

31
Q

medial ptergyoid insertion

A

medial angle of mandible

32
Q

lateral pterygoid function

A

one: move mandible laterally
both: depress, protrude

33
Q

lateral ptergyoid origin

A

lateral pterygoid plate (sphenoid) and greater wing

34
Q

lateral pterygoid insertion

A

pterygoid fovea (condylar process)
anterior part of articular disc
capsular ligament

35
Q

digastric posterior O –> I

A

mastoid notch –> hyoid

36
Q

digastric anterior O –> I

A

medial and inferior surface of mandible close to midline –> hyoid

37
Q

suprahyoids

A

genioyhoids, mylohyoids, digastric

38
Q

suprahyoid functions

A

depress

39
Q

digastric function

A

holds mandible in place, hyoid elevates to assist in swallowing

40
Q

infrahyoids

A

omohyoid, sternohyoid

41
Q

infrahyoid functions

A

hold hyoid in place

42
Q

all hyoid mm.

A

open mouth, depress mandible

43
Q

elevation mm (3)

A

masseter
temporalis (ant vert and mid oblique)
medial pterygoids

44
Q

depression mm (2)

A

both lateral pterygoids

supra and infrahyoids together

45
Q

retrusion (2)

A

temporalis (post horiz)

suprahyoids (w/ help from infras)

46
Q

protrusion (2)

A

bother lateral pterygoids
masster
medial ptergyoid

47
Q

lateral excursion

A

right lateral ptergyoid moves mandible left

48
Q

biomechanics: 3 orthopedic principles

A
  1. Ligaments do not participate actively in function of TMJ. They restrict/permit movements.
  2. Ligaments do not stretch, they elongate if traction force is applied, causing normal joint function to be compromised.
  3. The articular surfaces of TMJ must maintain contact (achieved by elevator muscles, capsular ligament).

Occlusion (3 decks)

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