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705 > Temporomandibular Joint > Flashcards

Temporomandibular Joint Flashcards

1
Q

muscle activation + joint motion =

A

joint loading

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2
Q

How is the position of the TMJ joint maintained?

A

position maintained by: muscles, ligaments, and the TM joint capsule

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3
Q

M-L length is __x that of the A-P

A

2X

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4
Q

Where is the TMJ palpated?

A

Palpated at the lateral pole just anterior to the external auditory meatus

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5
Q

What are the 2 joint surfaces covered by?

A

fibrocartilage

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6
Q

The articular surface are both ________ ( –>incongrutent joint)

A

convex

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7
Q

What is the articular disc interposed between?

A

the joint surfaces

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8
Q

The inferior TM joint cavity is made up of the:

A

mandibular condyle and inferior surface of the disc

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9
Q

The inferior TM joint cavity is considered a _______ joint.

A

hinge

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10
Q

The superior TM joint cavity is made up of the:

A

articular eminence and superior surface of the disc

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11
Q

The superior TM joint cavity is considered a _____ joint.

A

gliding

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12
Q

What are three properties of the articular disc?

A

1) bi-concave fibrocartilage disc
2) avascular and insensate
3) thin in the central portion and thickens anterior and posterior

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13
Q

Name 5 functions of the articular disc:

A

1) congruency for joint articulations
2) stability
3) minimizes loss of mobility
4) reduces friction
5) decreases stress on the TMJ

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14
Q

Is the lateral ligament of the TMJ complex the primary or secondary ligament?

A

primary

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15
Q

What function does the lateral ligament serve?

A

stabilizes the lateral aspect of the capsule
and
guides the condylar movement during mouth opening

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16
Q

What is normal ROM for depression and elevation

A

40-50mm

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17
Q

What is normal ROM for lateral deviation?

A

10-12 mm

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18
Q

What is normal ROM for protrusion

A

6-9mm

19
Q

What is normal ROM for retrusion

A

3mm

20
Q

What muscles aid in depression?

A

suprahyoids and lateral pterygoind (inferior head)

21
Q

What muscles aid in elevation?

A

temporalis, masseter, medial pterygoid

22
Q

What muscles aid in lateral deviation?

A

medial & lateral pterygoid to opposite side (contralateral movement) and temporalis to same side (ipsilateral)

23
Q

What muscles aid in retrusion?

A

bilateral temporalis and suprahyoids

24
Q

What is the depression/ opening of the mouth responsible for?

A

key for may functional activities

25
Q

What is the elevation/ closing of the mouth responsible for?

A

essential for grinding food

26
Q

What is the lateral deviation of the mouth responsible for?

A
  • side to side translation

- grinding motion associated with chewing

27
Q

What is the protrusion of the mouth responsible for?

A

(Mandible translates anteriorly)

Integral aspect of maximal opening of mouth

28
Q

What is the retrusion of the mouth responsible for?

A

(madible translates posteriorly)

Essential for functional activities

29
Q

The first 11* of arthrokinematic motion of the TMJ includes ______?

A

rotation

The condyle rolls relative to the inferior surface of the disc in the inferior joint

30
Q

True or false? The translation of the condyle and disc along the articular eminence in the superior joint normal should occur together?

A

True

31
Q

There is a : ratio opening to lateral deviation and protrustion

A

4:1

32
Q

During early phase of opening the ROM is _____ and the body of the mandible moves ______ and _______.

A

ROM is 35-50%

mandible moves posteriorly and inferior

33
Q

During late phase of opening the final ___% of ROM occurs.

A

50%

34
Q

During late phase of opening, movement occurs from ________ to translatory motion.

A

rotation

35
Q

During late phase of opening the condyle and disc move together ______ and _______.

A

forward and inferior

36
Q

During late phase of opening what kind of maximal stretch on the disc occurs?

A

maximal anterior stretch

37
Q

During closing tension from where retracts the disc?

A

Tension from the retrodiscal lamina

38
Q

Which occurs first and last: rotation or translation?

A

Translation - first

Rotation - last

39
Q

Is neck function an integral part of natural jaw behavior?

A

Yes

40
Q

What is TMD?

A

A collection of symptoms that involve the TMJ and surrounding structures (facial muscles, ligaments, teeth, ears, neck, etc).

41
Q

What symptoms are included in TMD?

A 
TMJ, face, ear, muslce, neck pain
Tinnitus (ringing in the ears)
Dizziness
Headache
Joint sounds (popping, clicking or grinding)
Limited mandibular ROM
42
Q

What can results in loss of tissue function and damage to the TMJ?

A

Unresolved and chronic inflammation

43
Q

What types of unresolved and chronic inflammation diseases may cause TMJ disfunction?

A

RA, other autoimmune disorders, trauma to the face/ TM joint, long periods of immobilization

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