9.2 The TMJ and Infratemporal Fossa Flashcards Preview

Semester 4- Head and Neck > 9.2 The TMJ and Infratemporal Fossa > Flashcards

Flashcards in 9.2 The TMJ and Infratemporal Fossa Deck (24):
1

What is the temporomandibular joint?

Articulation between the mandibular fossa, the articular tubercle and the head of the manbible allowing movements of the jaw

2

What separates the two bones?

Fibrocartilage disk- creates two synovial cavities

3

Why is the articular disk needed?

The bones are poorly aligned so the disk allows them to fit together.

4

Describe the capsule surrounding the TMJ

Thin and loose- allows movement but sacrifices stability

5

Name the 2 ligaments around the TMJ

Temporomandibular ligament x2
Medial ligament x2

6

Name the 2 accessory ligaments surrounding the TMJ

Sphenomandibular
Stylomandibular

7

What is the function of the sphenomandibular ligament?

Prevents inferior dislocation of the jaw

8

Why is dental hygiene important for the stability of the TMJ?

The jaw becomes much more stable when the jaw is closed

9

Which structure limits posterior dislocation?

The posterior glenoid tubercles

10

Which structure limits anterior dislocation?

Articular tubercle

11

What movement does the superior cavity produce?

Translation of the mandible

12

What movement does the inferior cavity produce?

Rotation of the mandible

13

Describe the process of closing the mouth

Posterior fibres of temporalis pull mandible backwards
Temporalis, masseter and medial pterygoid elevate the mandible

14

Describe the process of opening the mouth

Condyles pulled forward by lateral pterygoids
Chin pulled down and back by digastric muscles in lower cavity

15

What is bruxism?

Grinding of the teeth at night

16

Where is the infratemporal fossa located?

Below middle cranial fossa
Deep to zygomatic arch
Behind maxilla

17

Describe the borders of the infratemporal fossa

Anterior: Posterior surface of maxilla
Posterior: carotid sheath
Lateral: ramus of mandible
Medial: Lateral pterygoid plate of the sphenoid
Floor: Medial pterygoid muscle
Roof: Greater wing of sphenoid

18

Name the 3 muscles which lie in the infratemporal fossa

Lower part of temporalis
Lower part of medial pterygoid
Lower part of lateral pterygoid

19

Which nerves lie in the infratemporal fossa?

Mandibular nerve
Chorda tympani
Otic ganglion

20

Which artery lies in the infratemporal fossa?

Maxillary artery which becomes the middle meningeal artery

21

Which artery lies superficially to the infratemporal fossa?

Superficial temporal artery

22

Which veins pass through the infratemporal fossa?

Pterygoid venous plexus
Maxillary vein
Middle meningeal vein

23

Name the 5 openings of the infratemporal fossa

Foramen ovale
Foramen spinosum
Alveloar canal
Inferior orbital fissure
Pterygomaxillary fissure

24

Why is the infratemporal fossa a potentially dangerous place to grow a tumour?

Tumour can grow relatively large without being detected as it fills the potential space.
Will present late with numbing of the teeth and lips