Lecture 15 (TMJ And Muscles Of Mastication)

Question 1

What are the five TMJ movement?

Answer 1

Protrusion
Retraction
Elevation
Depression
Lateral movement (chewing and grinding)

Question 2

What cause the risk of dislocation?

Answer 2

The TMJ is most unstable during depression as the condylar process move anteriorly and lie beneath the articulator eminences making the anterior head more vulnerable to anterior dislocation

Question 3

What CN supplies muscles of mastications?

Answer 3

CN V trigeminal

Question 4

What branch of the trigeminal nerve innervate the temporal muscle?

Answer 4

Temporal nerves from mandibular trigeminal nerve

Question 5

Action of the temporal muscle?

Answer 5

Elevate and retract the mandible

Question 6

What branch of CN V innervate the masseter muscle?

Answer 6

V3 masseteric nerve

Question 7

Action of the masseter muscle?

Answer 7

Powerful elevator
It has three parts (superficial, middle and deep part)
Palpable while clenching teeth

Question 8

What nerve innervate the medial pterygoid muscle?

Answer 8

Main trunk of cv v3

Question 9

What nerve innervate the lateral pterygoid muscle

Answer 9

Lateral pterygoid and buccal nerve of anterior trunk of CN V3

Question 10

Name three ligament of TMJ

Answer 10

Lateral ligament = prevent dislocation
Stylomandibular ligament = thickening parotid capsule
Sphenomandibular ligament= support the mandible