Infratemporal Fossa And TMJ

Question 1

Where is the temporal fossa?

Answer 1

Superior to the zygomatic arch

Question 2

Where is the infratemporal fossa?

Answer 2

Inferior to the zygomatic arch

Question 3

What is the lateral boundary of the infratemporal fossa?

Answer 3

Ramus of the mandible

Question 4

What is the anterior border of the infratemporal fossa?

Answer 4

Maxilla

Question 5

What is the medial border of the infratemporal fossa?

Answer 5

Lateral pterygoid plate

Question 6

What is the roof of the infratemporal fossa?

Answer 6

Greater wing of the sphenoid

Question 7

What is the posterior border of the infratemporal fossa?

Answer 7

Tympanic plate + mastoid and styloid processes

Question 8

What is the inferior border of the infratemporal fossa?

Answer 8

Angle of the mandible

Question 9

What are the contents of the infratemporal fossa?

Answer 9

Inferior portion of the temporalis muscle, lateral and medial pterygoid muscles, maxillary artery, pterygoid venous plexus and nervous structures

Question 10

Which nervous structures are within the infratemporal fossa?

Answer 10

Branches of CN V3 including inferior alveolar, lingual and buccal nerves 
Chorda tympani (CN VII) and the otic ganglion

Question 11

Where is the maxillary artery in relation to the lateral pterygoid?

Answer 11

Can run lateral or medial to the lateral pterygoid

Question 12

Which muscles assist with opening the mandible?

Answer 12

Digastric, geniohyoid, mylohyoid and stylohyoid

Question 13

Which muscles assist in opening the mandible/jaw by fixing the larynx and hyoid?

Answer 13

Sternohyoid, sternothyroid, thyrohyoid and omohyoid

Question 14

Which structures are a part of the temperomandibular joint?

Answer 14

Joint capsule, articular disc, articular tubercle, postglenoid tubercle, inferior articular cavity, lateral (temporomandibular ligament) sphenomandibular ligament and stylomandibular ligament

Question 15

What is the function of the sphenomandibular and stylomandibular ligaments of the TMJ?

Answer 15

Limit inferior excursion at the TMJ

Question 16

Which nerve lies close to the TMJ?

Answer 16

Facial nerve

Question 17

Which muscles attaches to the articular disc of the TMJ?

Answer 17

Superior head of the lateral pterygoid as well as part of the inferior head

Question 18

What innervates the TMJ?

Answer 18

CN V including auriculotemporal, posterior deep temporal and masseteric nerves

Question 19

What occurs with anterior dislocation of the TMJ?

Answer 19

Lateral pterygoids cause the heads of the mandible to dislocate anteriorly (pass anterior to the articular tubercles)

Question 20

Where is the injection site for inferior alveolar nerve block?

Answer 20

Just lateral to the pterygomandibular raphe inside the mouth
Numbs teeth of lower dentition (mandibular teeth to the median plane)

Question 21

Where is the injection site if you want to anesthetize the molars?

Answer 21

Right about the 2nd molar

Question 22

Where is the injection site to anesthetize the premolars?

Answer 22

Further forward from the 2nd premolar at the 1st premolar

Question 23

How do you anesthetize the anterior teeth?

Answer 23

Injection coming deep to the skin and toward the infraorbital foramen
Anterior (infraorbital) superior alveolar nerve block

Question 24

What happens during gape of the TMJ at less than 15 degrees?

Answer 24

Simple hinging at the joint

Question 25

What happens at greater than 15 degrees of gape at the TMJ?

Answer 25

Anterior gliding onto the articular eminence