Head and Neck 2

Question 1

What are the bones of the TMJ?

Answer 1

head of mandible, mandibular fossa, articular tubercle

Question 2

What is the articular surface of the bones covered by?

Answer 2

fibrocartilage

Question 3

What are the articular surfaces separated by?

Answer 3

articular disc

Question 4

What are the ligaments of the TMJ?

Answer 4

sphenomandibular ligament
lateral ligament
stylomandibular ligament

Question 5

Where is an angle formed?

Answer 5

when a ramus and body meet

Question 6

What is the mandible formed by?

Answer 6

by the union, in midline, of two halves each having a horizontal body and a vertical ramus

Question 7

Describe ramus of mandible

Answer 7

Ramus is flat and has two processes at the superior end: coronoid process and condylar process (or head)/mandibular notch and foramen

Question 8

What nerve supplies the mandible?

Answer 8

Inferior alveolar nerve (mandibular division of trigeminal nerve (CN V))

Question 9

What nerves supplies TMJ?

Answer 9

auriculotemporal and masseteric branches of the mandibular nerve (CN V3).

Question 10

What type is the synovial joint?

Answer 10

condyloid type (modified hinge joint)

Question 11

What is the synovial joint between?

Answer 11

between condylar head of the mandible and the mandibular fossa of the temporal bone and the articular fossa

Question 12

What are the accessory ligaments of the synovial joint?

Answer 12

sphenomandibular and stylomandibular

Question 13

What is the capsule cavity divided into?

Answer 13

superior and inferior compartments

Question 14

What are the movements the joint can carry out?

Answer 14

Depression/elevation/protrusion and retraction

Question 15

Why is there greatest stability when mandible is elevated?

Answer 15

teeth are occluded and the condyle is secure in articular fossa

Question 16

What is the most common injury?

Answer 16

forward dislocation

Question 17

Where is the blood supply of the TMJ from?

Answer 17

External carotid artery: superficial temporal and maxillary branches

Question 18

What are the muscles of mastication?

Answer 18

Masseter
Temporalis
Medial Pterygoid
Lateral Pterygoid

Question 19

What is the nerve supply of the muscles of mastication?

Answer 19

mandibular division of Trigeminal nerve (V3)

Question 20

What is the only muscle that can open the mouth?

Answer 20

lateral pteryoid can depress the mandible

Question 21

What is the function of medial pteryoid?

Answer 21

elevates and protrudes the mandible

Question 22

What is the function of lateral pteryoid?

Answer 22

depresses and protrudes the mandible

Question 23

What muscles retract the mandible?

Answer 23

masseter and temporalis

Question 24

What muscles elevate the mandible?

Answer 24

temporalis, masseter and medial pteryoid

Question 25

What are the attachments of the temporalis muscle?

Answer 25

Originates from the temporal fossa. It condenses into a tendon, which inserts onto the coronoid process of the mandible.

Question 26

What are the attachments of the masseter muscle?

Answer 26

originates from the zygomatic arch of the temporal bone.

attach to the ramus of the mandible.

Question 27

What are the attachments for the medial pteryoid?

Answer 27

arises from the medial surface of the lateral pterygoid plate

inserts onto the medial surface of the angle of the mandible and ramus

Question 28

What are the attachments for the lateral pteryoid?

Answer 28

arises surface of the greater wing of sphenoid and lateral surface of the lateral pterygoid plate

inserts into anterior side of the mandibular condyle and articular disc of TMJ