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Occlusion > TMJ > Flashcards

TMJ Flashcards

1
Q

Temporomandibular Joint (TMJ)

A

The joint where the mandible articulates with

the base of the cranium

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2
Q

what fits into the TMJ

A

condyle of the mandible

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3
Q

Squamous part of the temporal bone (3)

A
  • MANDIBULAR FOSSA
  • GLENOID FOSSA
  • ARTICULAR FOSSA
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4
Q

what separates the TMJ and cranium?

A

articular disk

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5
Q

mediolateral length of condyle

A

15-20 mm

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6
Q

anteroposterior width of condyle

A

8-10 mm

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7
Q

poles of condyle (2)

A

medial

lateral

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8
Q

which of the following muscles of mastication inserts into the articular disc?

A

lateral pterygoid

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9
Q

Compound Joint (2)

A

–more than three bones

–condyle, temporal, articular disc

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10
Q

Complex Joint (1)

A

–allows more than one type of movement

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11
Q

Ginglymoarthrodial Joint (3)

–Ginglymoid joint implies
–Arthrodial joint implies
–Ginglymoarthrodial implies

A

hinging movement permitted
gliding movement
both hinging and gliding movements

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12
Q

Synovial Joint (1)

A

–Contains synovial fluid

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13
Q

arthrodial joint movement

A

translational movement

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14
Q

gingylmus joint movement

A

rotational

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15
Q

what muscle is mainly responsible for protrucing the mandible?

A

lateral pterygoid

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16
Q

ginglymo-arthrodial joint movement

A

rotational and translational movement

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17
Q

which of the following muscles retrudes the mandible

A

temporalis

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18
Q

Articular Disc is made of

A

dense fibrous connective tissue

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19
Q

shape of Articular Disc (2)

A

–Concave on the inferior part

–Concavo-convex on the superior part

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20
Q

Articular Disc innervation is (3)

A

Non-innervated and avascular

–Poor reparative capacity

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21
Q

is the articular disc flexible?

A

somewhat, yes

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22
Q

Articular Disc is divided into three sections:

A

• Anterior Zone
• Middle or Intermediate Zone (thinnest)
• Posterior (thickest)
Posterior > Anterior > Middle

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23
Q

Articular surface of the condyle functions on the — zone of the disc

A

intermediate

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24
Q

Disc is divided into

A

medial and lateral parts

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25
Q

Disc is thicker …

A

medially than laterally

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26
Q

Discal/Collateral Ligaments attach the disc

to the

A

medial and lateral poles of the

condyle and to the surrounding capsule

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27
Q

Articular Zone:

A

Most superficial layer. Unlike other
synovial joints, this layer is made of dense fibrous
connective tissue rather than hyaline cartilage; less
susceptible to aging and better ability to repair

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28
Q

Proliferative Zone:

A

Contains undifferentiated
mesenchymal cells and is responsible for
proliferation of articular cartilage in response to
loads

29
Q

Fibrocartilaginous Zone:

A

3D network of collagen

offering resistance to lateral and compressive forces

30
Q

Calcified Zone:

A

Made up of chrondrocytes and

chrondoblasts. Active site for bone remodeling.

31
Q

Synovial Joint
• All areas of the joint not involved in
articulation (internal surfaces of the cavities)
are covered with

A

specialized endothelial cells that form the synovial lining

32
Q

Synovial Joint produces

A

Synovial fluid (provides metabolic requirements and lubrication)

33
Q

Synovial Fluid acts as a

A

lubricant

34
Q

–Boundary lubrication:

–Weeping lubrication:

A

movement of fluid from one
area of the joint cavity to another, prevents
friction

articular surfaces absorb
some of the fluid, increased absorption during
function, metabolic exchange

35
Q

INNERVATION and VASCULARIZATION (2)

A 
• Mandibular branches of the trigeminal 
nerve (auriculotemporal and masseteric 
nerves)
• Superficial temporal artery mainly, which is 
a branch of the external carotid artery
36
Q

DISC ATTACHMENTS (3)

A 
• Posteriorly
• Anteriorly
• The disc is also attached to the capsular 
ligament not only anteriorly, but also 
posteriorly, medially and laterally.
37
Q

Posterior attachments of the disc (2)

A
  • Superior Retrodiscal Lamina

* Inferior Retrodiscal Lamina

38
Q

Superior Retrodiscal Lamina (4)

A

– Attaches the articular disc to the tympanic plate
– Connective tissue
– Lots of elastic fibers
– Stretches as joint is moved forward

39
Q

Inferior Retrodiscal Lamina (2)

A

– Collagenous attachment (not elastic)

– Attaches the posterior of disc to the posterior margin of the articular surface of the condyle

40
Q

Anterior attachments of the disc (collagenous) (3)

A
  • Superior head of the lateral pterygoid muscle (tendinous)
  • Superior anterior attachment
  • Inferior anterior attachment
41
Q

Superior anterior attachment (2)

A

–to the Capsular Ligament

–to the anterior margin of the articular surface of the temporal bone

42
Q

skipped

Inferior anterior attachment (2)

A

–to the Capsular ligament

–to anterior margin of the articular surface of the condyle

43
Q

Superior Joint Cavity

Bordered by the (2)

A

–glenoid fossa

–superior aspect of the disc

44
Q 
Inferior Joint cavity
Bordered by  (2)
A

–inferior aspect of the disc

–superior aspect of the condyle

45
Q

Rotation occurs in the — joint compartment

A

inferior

46
Q

Translation in the — joint compartment

A

superior

47
Q

which of the following is a correct statement?

the mediolateral length of the condyle is…

A

15-20 mm

48
Q

Functional ligaments (3)

A

–Collateral/Discal ligaments
–Capsular ligament
–Temporomandibular ligament

49
Q

Accessory ligaments (2)

A

–Sphenomandibular ligament

–Stylomandibular ligament

50
Q

Capsular Ligament /Joint Capsule

A

Ligament that surrounds the joint like a curtain

51
Q

Capsular Ligament /Joint Capsule is attached to the (2)

A

he base of the skull and the condyle

52
Q

Capsular Ligament /Joint Capsule is attached at the — of the articular parts

A

periphery

53
Q

Capsular Ligament /Joint Capsule is also attached t the disc (2)

A

medially and laterally

54
Q

Capsular Ligament /Joint Capsule retains..

A

synovial fluid

55
Q

Temporomandibular Ligament

A

Thickening of the capsular ligament on the lateral

aspect

56
Q

skipped

Temporomandibular Ligament extends from

A

articular tubercle and zygomatic process to the lateral pole and neck of the condyle,
and the disk

57
Q

2 parts of Temporomandibular Ligament

A

outer oblique

inner horizontal

58
Q

Function of the Outer Oblique part (2)

A

–Prevents over rotation of the mandible
–Causes translation of the mandible after 20-25
mm opening

59
Q

Function of the Inner Horizontal part (2)

A

–Limits posterior movement onto the highly
innervated retrodiscal tissue (PAIN)
–Prevents excessive overextension of the lateral
pterygoid muscle

60
Q

Sphenomandibular Ligament arises from the

A

sphenoid bone

61
Q

Sphenomandibular Ligament inserts onto the

A

medial surface of the ramus of the mandible called the lingula

62
Q

Sphenomandibular Ligament function

A

no known function in limiting mandibular movement

63
Q

Stylomandibular movement arises from

A

styloid process

64
Q

Stylomandibular movement inserts into

A

posterior border on the ramus of the mandible

65
Q

Stylomandibular movement function

A

limits excessive protrusive movement of the mandible

66
Q

sphenomandibular ligament
o:
I:

A

o: angular spine of sphenoid bone
I: mandibular lingula

67
Q

sylomandibular ligament
o:
I:

A

o: soloed process
I: angle of mandible

68
Q

the tympanic plate is part of which bone?

A

temporal

69
Q

the external auditory meatus is located in which bone?

A

temporal

Occlusion (15 decks)

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