09.2 TMJ and Infratemporal Fossa

Question 1

What are the bony surfaces involved in the TMJ?

Answer 1

Mandibular fossa
Articular tubercle
Head of mandible

Question 2

What are the surfaces of the TMJ seperated by?

Answer 2

Articular disc and 2 synovial joints

Question 3

What ligaments are present in the TMJ?

Answer 3

Lateral Ligament
Sphenomandibular ligament
Stylomandibular ligament

Question 4

What does the lateral ligament of the TMJ prevent?

Answer 4

Posterior dislocation

Question 5

What does the stylomandibular ligament of the TMJ do?

Answer 5

Support the weight of the jaw

Question 6

What muscles protrude the jaw?

Answer 6

Lateral and medial pterygoids

Question 7

What muscles retract the jaw?

Answer 7

Temporalis

Question 8

What muscles elevate the jaw?

Answer 8

Temporalis
Masseter
Medial pterygoid

Question 9

What are the boundaries of the infratemporal fossa?

Answer 9

Lateral - Ramus of Mandible
Medial - Lateral pterygoid plate of the sphenoid
Anterior - Maxilla
Posterior - Carotid sheath

Question 10

What muscles are in the infratemporal fossa?

Answer 10

Lateral and medial pterygoids

Masseter and temporalis insert/originate in the fossa

Question 11

What nerves are in the infratemporal fossa?

Answer 11

Mandibular nerve (CNV)
Sensory branches of CNV
Chorda tympani (CNVII)
Otic ganglion (parotid gland parasympathetics)

Question 12

What vasculature is present in the infratemporal fossa?

Answer 12

Maxillary artery

Pterygoid plexus

Question 13

What bones make up the pterion?

Answer 13

Frontal, parietal, temporal, and sphenoid

Question 14

What can happen if the pterion fractures?

Answer 14

Lacerates MMA leading to extradural haematoma