12) TMJ and Infratemporal Fossa Flashcards Preview

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Flashcards in 12) TMJ and Infratemporal Fossa Deck (21):
1

What are the articulations in the temporomandibular joint?

Condyle of mandible
Mandibular fossa
Articular tubercle (temporal bone)

2

What separates the articular surfaces?

Articular disk

3

What covers the articular surfaces?

Fibrocartilage

4

What are the 3 extra-capsular ligaments of the TMJ?

Lateral (temporomandibular)
Stylomandibular
Sphenomandibular

5

What muscles cause elevation of the TMJ?

Temporal, masseter and medial pterygoid

6

What muscles cause depression of the TMJ?

Lateral pterygoid and supra/infrahyoid muscles (mainly gravity)

7

What muscle causes protrusion of the TMJ?

Lateral pterygoid

8

What muscle causes retrusion of the TMJ?

Temporal

9

What muscles cause lateral movements of the TMJ?

Temporal on same side, pterygoids on opposite side and masseter

10

What is the nerve supply to the muscles of mastication?

Mandibular branch of trigeminal

11

Describe a TMJ dislocation:

Anterior causing head of mandible to move out of mandibular fossa (anterior to articular tubercle)

12

What can be damaged in a TMJ dislocation?

Facial and auriculotemporal nerves

13

What can cause a TMJ dislocation?

Blow to side of face, yawning or taking a large bite

14

What other TMJ disorders are there?

Bruxism (teeth grinding)
Osteoarthritis
Inter-articular disk derangement

15

How do TMJ disorders usually present?

Pain in region of auriculotemporal nerve (V3)

16

What are the muscular contents of the infratemporal fossa?

Temporal, lateral and medial pterygoid muscles

17

What are the vascular contents of the infratemporal fossa?

Maxillary artery and vein
Pterygoid venous plexus

18

What are the nervous contents of the infratemporal fossa?

Mandibular nerve: inferior alveolar, lingual, buccal nerves
Chorda tympani
Otic ganglion

19

What pathology can occur in the infratemporal fossa?

Risk of cavernous sinus thrombosis due to communication with pterygoid plexus
Extradural haematoma
Isolated infections

20

What is the clinical relevance of the infratemporal fossa?

Used as site for mandibular nerve blocks

21

Describe the location of the infratemporal fossa:

Deep and inferior to zygomatic arch and deep to ramus of mandible