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1

What is TMJ?

Refers to temporomandibular joint

2

What is TMD?

Disorders of the joint

3

What is CMD?

Craniomandibular disorder
- Broader definition

4

Where does TMD rank in terms of chronic pain world wide? (1st?, 5th?, 10th?, etc...)

3rd

5

Do women or men more commonly develop TMD?

Women (3.3:1)

6

When does TMD peak?

Between 20 - 40 years old

7

When does TMJ disc displacement/ internal derrangements peak?

30 years of age

8

When does arthridies of the TMJ peak?

50 years of age

9

What are the 3 skeletal components of the TMJ?

- Maxilla
- Temporal bone
- Mandible
(condyle forms a bony joint partner)

10

What are the shapes of the mandibular joint surfaces?

- Convex anterior-posteriorly, and medial-laterally

11

Which pole of the mandible is most prominent from an anterior view?

Medial

12

What structure of the temporal bone does the mandible slide over during mouth opening?

The articular eminence

13

Where does the mandibular bone rest with the mouth shut?

- On the mandibular fossa

14

Which portion of the articular disc is thinnest?

The middle portion between the anterior and posterior aspects.

15

What structure controls the movement of the disc from the posterior aspect?

The retrodiscal laminae

16

What structure on the anterior aspect of the disc helps to control movement?

The lateral pterygoid muscle.

17

What structural effect does the disc have on the joint space?

- Divides it into an upper and lower portion

18

What are the 4 passive structures that stabilize the TMJ?

- Joint capsule
- Lateral TM ligament
- Stylomandibular ligament
- Sphenomandibular ligament

19

What are the 2 lateral ligaments of the TMJ, and what is their function?

- Lateral temporomandibular ligament
- Stylomandibular ligament
- Control end-range positioning

20

What structures are closely associated with the TMJ passive structures?

- Nerves and blood vessels
- Maxillary artery
- Lingual nerve

21

What ligament is found on the medial side of the TMJ?

- Sphenomandibular ligament

22

What areas receive sensory innervation from C2, C3, and C4?

C2: Back half of the head
C3: Lower posterior portion of head into the shoulder
C4: Shoulder, anterior and posterior thorax

23

What nerve innervates the face?

- The trigeminal nerve

24

Which trigeminal nerves are purely sensory, and what portions of the face do they innervate?

- Opthalmic: Forehead to eyes
- Maxillary: Maxilla

25

Which trigeminal nerve is both sensory and motor? What does it innervate?

- Mandibular nerve
- Sensory to mouth and jaw
- Motor control of muscles of mastication

26

Where does the afferent input of the trigeminal nerve originate before it enters the spinal tract?

At the level of the pons

27

What other pain fibers also synapse on the spinal nucleus of the the trigeminal nerve?

C1 - C4

28

What 4 muscles close the jaw?

- Temporalis
- Masseter
- Medial pterygoid
- Portions of lateral pterygoid

29

What 4 muscles open the jaw?

- Diagastric
- Mylohyoid
- Genohyoid
- Omohyoid

30

What 3 muscles assist gravity in opening the mouth?

- Infrahyoid
- Suprahyoid
- Inferior head of lateral pterygoid