TMJ

Question 1

why is it called the temporomandibular joint?

Answer 1

because it is the junction of temporal and mandible

Question 2

3 TMJ function

Answer 2

1. speech
2. masitcation
3. Deglutition-swallowing

Question 3

TMJ innervated by what cranial nerve?

Answer 3

V3

Question 4

Blood supply comes from?

Answer 4

branches of external carotid

Question 5

Anatomy of TMJ:

Temporal bone, Fibrocartilage, and Enclosed characterisitics

Answer 5

Temporal-articulating surfaces include the articular eminence and glenoid fossa
Fibrocartilage-for articulating surface
Enclosed-in fibrous joint capsule

Question 6

two synovial cavities found within the joint disc

Answer 6

-meniscus creates superior and inferior compartments

Question 7

what does the synovial fluid secreted by membranes act as

Answer 7

acts as a lubricant for condyle

Question 8

pathology of joint disc

Answer 8

-if there is problems such as:
-pain on function
-limiting function
-stuck on opening
then there is something wrong

Question 9

what muscles allow the mandible to move?

Answer 9

• masster: hyperstrophy, tenderness, and atrophy
• temporalis
• medial pterygoid

Question 10

what are the two disc compartment motions

Answer 10

1. temporodiscal: superior compartment, and motion is translatory
2. condylodiscal: inferior compartment, and motion is rotational

Question 11

what order does the disc compartments work?

Answer 11

1. to open the mandible is rotational
2. to open the mandible wider is translatory
3. to close the mandible is translatory
4. to close the mandible all the way is rotational

Question 12

function of ligaments

Answer 12

to create an envelope of movement

Question 13

3 joint ligaments used

Answer 13

1. tempromandibular which prevents excessive retraction
2. sphenomandibular which prevents excessive protrusion
3. stylomandibular which prevents excessive protrusion

Question 14

Protrusion movement and muscles used

Answer 14

movement: both compartments gliding
muscles: bilateral L. pyterygoids (inferior heads)

Question 15

Retraction movement and muscles used

Answer 15

movement: both compartments gliding
muscles: bilateral posterior temporalis

Question 16

Elevation movement and muscles used

Answer 16

movement: gliding both superior and rotation of both inferior compartments
muscles: temporalis, M. Ptyerygoid, and masseter

Question 17

Depression movement and muscles used

Answer 17

movement: same as elevation which is gliding of both superior and rotation of both inferior compartments
muscles: inferior head of L. Ptyerygoid and suprahyoid bilaterally

Question 18

Lateral deviation movement and muscles used

Answer 18

movement: gliding one superior cavity and rotation of opposite superior cavity
muscles: Unilateral L. Ptyergoid

Question 19

TMJ disorders

Answer 19

1. clenching-holding teeth together
2. bruxism-clenching with grinding
3. trauma
4. subluxation-dislocation of joint-condyle ahead of articular surface