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620: Clinical Human Anatomy > TMJ > Flashcards

Flashcards in TMJ Deck (17)
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1
Q

The tempomandibular joint is an articulation between what 2 osseous structures?

A

The mandibular fossa and the articular tubercle of the temporal bone

2
Q

The mandibular portions of the TMJ are con____ and the articular eminence of the temporal bone is con____.

A

convex

concave

3
Q

The TMJ is what kind of joint?

A

a modified hinge joint

4
Q

What movements occur at the TMJ?

A

Gliding (protrusion/retrusion)
Rotation (grinding and chewing)
Angling (elevation/depression)

5
Q

What separates the 2 bones of the TM joint?

A

An oval-shaped fibrocartilaginous articular disc called the articular disc of the TMJ

6
Q

The articular disc of the TMJ creates what?

A

2 joint spaces (superior and inferior)

7
Q

Describe the shape of the articular disc

A

The central, intermediate portion of the disc is thin while the anterior and posterior aspects, or bands, are thicker

8
Q

What muscles is attached to the disc anteriorly?

A

lateral pterygoid

9
Q

The TMJ allows the mouth to open how wide?

A

35-40mm or 2 to 3 knuckles

10
Q

What are the 4 muscles of mastication that move the mandible?

A
  • Masseter
  • Temporalis
  • Medial Pterygoid
  • Lateral Pterygoid
11
Q

What is the first motion at the TMJ when the mouth opens?

A

During the first 20 mm the motion is rotation

12
Q

Describe what the mandible and articular disc do during the first 20 mm of movement

A

The mandible and meniscus move anteriorly together beneath the articular eminence

13
Q

What is the second motion at the TMJ when the mouth opens?

A

During the second 20 mm the motion is translation (the jaw further forward or from side to side)

14
Q

What are the symptoms of a frayed or dislocated articular disc?

A

Bitemporal headaches (temporalis muscle overuse), clicking during jaw opening and reduced range of motion

15
Q

How is a frayed articular disc repaired?

A

surgically

16
Q

Temporomandibular Disorders (TMDs) affect more than __% of the population

A

25%

17
Q

What percent of those seeking treatment are women?

A

90%