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Biomechanics & Kinesiology of the Spine > TMJ > Flashcards

TMJ Flashcards

1
Q

What is the shape of the articular disc of the TMJ?

A

Bi-concave

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2
Q

Is the articular disc mainly vascular or avascular?

A

Avascular

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3
Q

Is the peripheral aspect of the articular disc vascular or avascular?

A

Vascular

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4
Q

What are the 3 divisions of the articular disc?

A

Anterior
Intermediate
Posterior

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5
Q

The articular disc sits where in relation to the condyle?

A

On top of the condyle

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6
Q

What are the 2 joint cavities of the TMJ?

A

Superior joint cavity

Inferior joint cavity

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7
Q

Where is the inferior joint cavity located?

A

Between the mandibular condyle and the inferior surface of the articular disc

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8
Q

Where is the superior joint cavity located?

A

Between the superior surface of the articular disc and the mandibular fossa

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9
Q

What type of joint is the superior joint cavity?

A

Gliding

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10
Q

What type of joint is the inferior joint cavity?

A

Hinge

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11
Q

What is the primary motion during the initial phase of jaw opening?

A

Rotation

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12
Q

What is the primary motion during the late phase of jaw opening?

A

Translation

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13
Q

Do the lateral and medial pterygoids muscles produce contralateral or ipsilateral motion of the jaw?

A

Contralateral

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14
Q

Do the masseter and temporalis muscles produce contralateral or ipsilateral motion of the jaw?

A

Ipsilateral

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15
Q

What are the arthrokinematics of the mandibular condyle during rotation?

A

Mandibular condyle rolls relative to the inferior surface of the disc

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16
Q

What are the arthrokinematics of the mandibular condyle during translation?

A

Mandibular condyle and articular disc slide together

17
Q

Describe the 4 main roles of the articular disc of the TMJ

A
  1. Adds concavity to the joint
  2. Improves mobility of the joint
  3. Stabilizes the joint
  4. Reduces friction in the joint
18
Q

What type of joint is the TMJ?

A

Diarthrodal synovical

19
Q

Does TMD affect more females or males?

A

Females

20
Q

What muscles depress the mandible? (3)

A

Inferior fibers of lateral pterygoid
Suprahyoids
Infrahyoids

21
Q

What muscles elevate the mandible? (3)

A

Temporalis
Masseter
Medial pterygoid

22
Q

What muscles laterally deviate the mandible? (4)

A

Temporalis and masseter (ipsilateral)

Medial and lateral pterygoid (contralateral)

23
Q

What muscles protrude the mandible? (3)

A

Masseter

Medial and lateral pterygoids

24
Q

What muscles retrude the mandible? (3)

A

Deep fibers of masseter
Temporalis
Suprahyoids

25
Q

What are the 3 ligaments of the TMJ?

A

Temporomandibular
Stylomandibular
Sphenomandibular

26
Q

Is there more stability in the medial/lateral aspect of the TMJ or the anterior/posterior aspect?

A

Medial/lateral

27
Q

Is there more mobility in the medial/lateral aspect of the TMJ or the anterior/posterior aspect?

A

Anterior/posterior

28
Q

What is another name for the temporomandibular ligament?

A

Lateral ligament

29
Q

What motion do the superficial oblique fibers of the lateral ligament limit?

A

Rotation of condylar head

30
Q

What motion do the deep fibers of the lateral ligament limit?

A

Posterior displacement of condylar head

31
Q

What motion do the stylomandibular and sphenomandibular ligaments limit?

A

Excessive protrusion of the mandible

Biomechanics & Kinesiology of the Spine (4 decks)

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