Temperomandibular Joint Flashcards Preview

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Flashcards in Temperomandibular Joint Deck (22)
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1

What type of joint is the TMJ

Hinge synovial

2

What does the articular disk do

Divides TMJ into
Superior - protrusion and retrusion
Inferior - elevation and depression

3

Articulation of the TMJ

Squamous part of temporal bone - articular tubercle and mandibular fossa
Condyles of mandible

4

What are the ligaments of the TMJ

Lateral - prevents lateral and posterior displacement
Stylomandibular - separates parotid and submandibular glands
Sphenomandibular - prevents inferior displacement

5

What muscles elevate the mandible

Temporal
Masseter
Medial pterygoid

6

What depresses the mandible

Lateral pterygoid
Mainly gravity

7

What muscle protrudes the mandible

Lateral pterygoid

8

What muscle retrudes the mandible

Temporal

9

What muscles give lateral movement to the mandible

Masseter
Temporal (same side)
Pterygoids (opposite side)

10

What causes anterior dislocation of the mandible

Lateral blow to chin with mouth open
Excessive contraction of lateral pterygoids e.g yawning

11

Consequences of anterior mandible dislocation

Lock jaw (can't elevate mandible)
Damage to facial nerve, inferior alveolar nerve or auriculotemporal nerve (from V3)

12

Disorders of the TMJ

Osteoarthritis
Dislocation
Bruxism
Temporal arteritis
Inter-articular disk derangement

13

Describe temporal arteritis

Type of vasculitis giving pain around the TMJ
Can cause blindness

14

Superior boundary of the infratemporal fossa

Greater wing of sphenoid

15

Inferior boundary of the infratemporal fossa

Where medial pterygoid attaches to the mandible

16

Anterior boundary of the infratemporal fossa

Maxilla

17

Posterior boundary of the infratemporal fossa

Temporal bone

18

Medial boundary of the infratemporal fossa

Lateral pterygoid plate of sphenoid

19

Lateral boundary of the infratemporal fossa

Ramus of mandible

20

Contents of the infratemporal fossa

Temporal muscle
Pterygoids
Maxillary artery and vein
Pterygoid venous plexus
Mandibular nerve
Chorda tympani
Otic ganglion

21

What branches of the mandibular nerve arise in the infratemporal fossa

Inferior alveolar - sensory to lower teeth, lower lip and chin
Lingual - general sensory to anterior 2/3 tongue
Buccal - sensory to cheek and buccal gum

22

Clinical relevance of the infratemporal fossa

Isolated infection in immunocompromised patient - can spread to cavernous sinus to cause cavernous sinus thrombosis
Mandibular nerve blocks - through mandibular notch of ramus