TMJ Flashcards

(31 cards)

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?

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
What are the 3 ligaments of the TMJ?
Temporomandibular Stylomandibular Sphenomandibular
26
Is there more stability in the medial/lateral aspect of the TMJ or the anterior/posterior aspect?
Medial/lateral
27
Is there more mobility in the medial/lateral aspect of the TMJ or the anterior/posterior aspect?
Anterior/posterior
28
What is another name for the temporomandibular ligament?
Lateral ligament
29
What motion do the superficial oblique fibers of the lateral ligament limit?
Rotation of condylar head
30
What motion do the deep fibers of the lateral ligament limit?
Posterior displacement of condylar head
31
What motion do the stylomandibular and sphenomandibular ligaments limit?
Excessive protrusion of the mandible