Temporomandibular Joint

Question 1

What type of joint in the temporomandibular joint?

Answer 1

modified hinge joint

Question 2

What are the 2 articular surfaces of TMJ?

Answer 2

1. head or condyle of mandible

2. articular tubercle & mandibular fossa of squamous part of temporal bone

Question 3

What divides tmj into superior and inferior compartments?

Answer 3

oval fibrocartilaninous disc

Question 4

What thickens the capsule around the joint?

Answer 4

lateral ligament

Question 5

What are the 2 other ligaments that connect the mandible to the cranium (although they are not strong)?

Answer 5

1. stylomandibular ligament

2. sphenomandibular ligament

Question 6

During opening of the jaw, what are the 2 movements?

Answer 6

1. anterior gliding (occurs in upper cavity)

2. hingle like rotation (occurs in lower cavity)

Question 7

During protrusion and retrusion how does the head and articular disc move?

Answer 7

head and articular disc slide anteriorly & posteriorly both sides move together in grinding fashion