Temporomandibular Joint Flashcards Preview

ESA 4 - Head and Neck > Temporomandibular Joint > Flashcards

Flashcards in Temporomandibular Joint Deck (34):
1

What is the temporomandibular joint? 

A modified synovial joint between the cranium and the mandible

2

What are the articulations of the temporomandibular joint? 

  • Condyle of the mandible 
  • Articular tubercle of temporal bone
  • Mandibular fossa

 

3

What does the articular disc of the TMJ do? 

Divides the TMJ into superior and inferior compartments 

4

Describe the joint capsule of the TMJ?

Relatively loose

5

What is the result of the joint capsule of the TMJ being relatively loose? 

It sacrifices stability for movement 

6

What ligaments support the TMJ? 

  • Lateral ligament
  • Stylomandibular ligament
  • Sphenomandibular ligament 

 

7

What is the most important of the TMJ ligaments? 

Lateral ligament

8

What is the lateral ligament of the TMJ also known as?

The temporomandibular ligament 

9

Where is the lateral ligament of the TMJ? 

Between the temporal bone and the mandible

10

Where does the stylomandibular ligament run? 

From styloid process to behind angle of mandible 

11

Where does the sphenomandibular ligament run? 

Sphenoid bone to internal surface of mandible 

12

What muscles are responsible for elevation of the TMJ?

  • Anterior fibres of temporal 
  • Masseter
  • Medial pterygoid

 

13

What muscles are responsible for depression of the mandible?

  • Lateral pterygoid
  • Supra/infra-hyoid

 

14

What is depression of the mandible mostly done by? 

Gravity 

15

When are muscles required for depression of the mandible? 

When against resistance

16

What muscle is responsible for protrusion of the mandible? 

Mainly lateral pterygoid

17

What muscle is responsible for retrusion of the mandible? 

Posterior fibres of temporal 

18

What muscles are responsbile for lateral movements of the mandible? 

  • Temporal on same side
  • Pterygoids of the opposite side
  • Masseter

19

What are the muscles of mastication? 

  • Temporalis
  • Masseter
  • Pterygoids

 

20

What are the muscles of mastication supplied by? 

Mandibular branch of trigeminal nerve

21

What causes a TMJ dislocation? 

Commonly a sideways blow to the chin when the mouth is open, whcih causes an anterior dislocation of the same side

22

What happens in a TMJ dislocation? 

Head of mandible moves anteriorly to the articular tubercle

23

What needs to be checked for when someone presents with a TMJ dislocation? 

Fracture on the opposite side of the jaw

24

How is a TMJ dislocation managed? 

Inferior and posterior traction to relocate

25

Where is pain around the TMJ felt?

Just anterior to the tragus

26

What nerve supplies the TMJ? 

The auriciulotemporal nerve, a branch of TMJ

27

What must a doctor be aware of as a differential diagnosis when a patient presents with pain around the TMJ? 

Temporal arteritis 

28

What is the risk of missing a diagnosis of temporal arteritis? 

Loosing patients sight

29

What can cause pain around the TMJ? 

  • Bruxism (teeth grinding)
  • Osteoarthritis of the TMJ
  • Inter-articular disc derangement

 

30

What is the likely route of management when there is inter-articular disc derangement? 

Surgery to get the abnormality fixed

31

What % of cases of pain around the TMJ are multifactoral? 

80% 

32

What factors contribute to a condition causing pain around the TMJ? 

  • Anatomical 
  • Psychological
  • Social

 

33

What psychological factors contribute to a condition causing pain around the TMJ? 

Anxiety

34

What social factors contribute to a condition causing pain around the TMJ? 

  • Alcohol
  • Smoking
  • Sleep disorders