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Flashcards in TMJ Deck (19):
1

why is it called the temporomandibular joint?

because it is the junction of temporal and mandible

2

3 TMJ function

1. speech
2. masitcation
3. Deglutition-swallowing

3

TMJ innervated by what cranial nerve?

V3

4

Blood supply comes from?

branches of external carotid

5

Anatomy of TMJ:
Temporal bone, Fibrocartilage, and Enclosed characterisitics

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

6

two synovial cavities found within the joint disc

-meniscus creates superior and inferior compartments

7

what does the synovial fluid secreted by membranes act as

acts as a lubricant for condyle

8

pathology of joint disc

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

9

what muscles allow the mandible to move?

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

10

what are the two disc compartment motions

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

11

what order does the disc compartments work?

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

12

function of ligaments

to create an envelope of movement

13

3 joint ligaments used

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

14

Protrusion movement and muscles used

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

15

Retraction movement and muscles used

movement: both compartments gliding
muscles: bilateral posterior temporalis

16

Elevation movement and muscles used

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

17

Depression movement and muscles used

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

18

Lateral deviation movement and muscles used

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

19

TMJ disorders

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