TMJ

Question 1

temporomandiublar joint

Answer 1

• synovial hinge like joint
• fibrocartilage vs hyaline
• articular disc
• motions: elevation/depression - lateral deviation
• protrusion/retrustion

Question 2

temporomandibular articular surfaces are covered in ____ instead of hyaline

Answer 2

fibrocartilage

Question 3

temporal and mandibular make up the _______ ______ and provide muscular attachment

Answer 3

articular surfaces

Question 4

lateral pterygoid plate of the sphenoid promised origin for

Answer 4

lateral and medial pterygoids

Question 5

major muscles that elevates the mandible

Answer 5

masseter and temporalis

Question 6

part of the mandible

Answer 6

mandiubar condole , coronoid process and angle

Question 7

purpose of inferior and superior joint cavities

Answer 7

helps the disc - mobile

Question 8

purpose of retrodical laminae

Answer 8

tether the disc and bring it back into closed position after opening

Question 9

dis glides ___ as the jaw opens

Answer 9

anteriorly

Question 10

depression - opening of jaw ROM

Answer 10

35-55mm

Question 11

profusion - jaw forward ROM

Answer 11

6-8mm

Question 12

lateral deviation - side to side ROM

Answer 12

approx 10 mm to either side

Question 13

Joint axis of the mandible

Answer 13

horizontal
anterior/posterior
vertical

Question 14

horizontal axis allows for

Answer 14

depression and elevation

Question 15

anterior. and posterior axis allows for

Answer 15

chewing - rocking motion

Question 16

vertical axis allows for

Answer 16

lateral deviation

Question 17

motion of lateral deviation

Answer 17

spin ipsilateral and protrude opposite

Question 18

true or false: mandible is always the joint partner that moves

Answer 18

true

Question 19

inferior joint arthrokinematics

Answer 19

rolls posteriorly during depress so glides anteriorly

Question 20

superior joint arthrokinematics

Answer 20

anterior translation and slight inferior translation

Question 21

purpose of retrodiskal fibers

Answer 21

restrain further translation

Question 22

closed pack position

Answer 22

teeth closed

Question 23

resting postion (open pack)

Answer 23

mouth slightly open, lips together, teeth not in contact tongue resting behind top teeth

Question 24

capsular pattern

Answer 24

limitation of mouth opening

Question 25

occlusal positioned

Answer 25

gentle contact of teeth

Question 26

forward head may cause

Answer 26

- posterior tension - increased compression

Question 27

forward head posture (FHP)

Answer 27

upper cervical spine extension is likely linked to TMJ dysfunction because of its effect on the soft tissues that retried the jaw and its effect (stress/compression) on the joint from malpositioning

Question 28

having the jaw in more traded position during forward lean of the neck may result in increase or decrease of JRF?

Answer 28

higher joint reaction forces

Question 29

other signs of TMJ when you have a forward head posture?

Answer 29

- stretching infrahyoid muscles - alters length tension of masticatory muscles (muscle tightening)

Question 30

muscles of mastication

Answer 30

- masseter - temporalis - lateral/medial pterygoid

Question 31

accessory muscle of the TMJ

Answer 31

- buccinator - tongue - suprahyoid muscles -infrahyoid muscles

Question 32

nerves innervating masticators

Answer 32

CN V - mandibular branch

Question 33

nerve innervating infrahyoids

Answer 33

ventral rami of C1-C3

Question 34

nerve innervating suprahyoids

Answer 34

CN V, VII, XII

Question 35

temporalis actions

Answer 35

- elevate -retrusion -ipsilateral deviation

Question 36

Masseter fibers and what do they do specifically and the purpose of each is to?

Answer 36

- Superficial: Protrusion -Deep: Retrusion - stabilize and elevate mandible

Question 37

massester action

Answer 37

- elevate - protrude -retrude - ipsilateral deviate

Question 38

Temporalis and masseter both innervated by

Answer 38

CN V - mandibular branch

Question 39

muscles of protrusion

Answer 39

pterygoids

Question 40

lateral pterygiod runs horizontal and does what?

Answer 40

pull the disk forward

Question 41

superior head of lateral ptyergoid runs from

Answer 41

pterygoid plate to castle disk

Question 42

inferior head of lateral ptyergoid runs from

Answer 42

pterygiod plate to the neck of the mandible

Question 43

medial pterygoid runs superiorly ------

Answer 43

lateral pterygoid plate to mineral surface of ramus of mandible near the angle (superficial head to maxilla)

Question 44

what mandibular motions would the lateral or medial pterygoid cause if both sides contract

Answer 44

protrusion

Question 45

what mandibular motions would the lateral or medial pterygoid cause if one side contracts

Answer 45

contralateral lateral deviation

Question 46

what head causes disc anterior glide

Answer 46

lateral pterygoid superior head

Question 47

how does the muscles of masseter and pterygoid influence lateral deviation

Answer 47

pterygoids to opposite side and masseter to ipsilateral side

Question 48

the line of pull of temporalis during lateral deviation

Answer 48

minimal ability to ipsilaterally deviate - mostly elevates

Question 49

what muscles assist with madnbiular depression and innervated by

Answer 49

suprahyoids - CN V, VII, XII

Question 50

what muscles tagline the hyoid bone to provide stable base for suprahyoids and innervated by?

Answer 50

infrahyoids - Ventral rami C1-C2-C3

Question 51

deep fibers of masseter stabilize the jaw in

Answer 51

anterior - posterior

Question 52

tmepralis dual action - Posterior helps with and both heads does?

Answer 52

posterior helps with recursion and both heads will elevate

Question 53

supra hyoid muscles does

Answer 53

depression of the jaw (open mouth)

Question 54

importance of tongue

Answer 54

taste, resonance, pronunciation, food placement and swallowing

Question 55

true or false: tongue is useful for correcting of lateral deviation

Answer 55

true: tip of tongue to roof of mouth can facilitate symmetric opening of the mouth

Question 56

working side

Answer 56

side of chewing

Question 57

balancing side

Answer 57

side without food and sustain higher loads than chewing side

Question 58

chewing stroke: 1-2 and 3-4

Answer 58

1-2: depression + deviation 3-4: elevation + deviation

Question 59

why does balancing side get a higher compression force?

Answer 59

relative distraction of working side with up to 2x increased compression force on balancing side

Question 60

describe anterior displacement with reduction

Answer 60

- opening of the mouth (disc displaced) - anterior to the condyle cause opening clicking - closing of the mouth results in disc dislocation (closing click)

Question 61

describe anterior displacement without reduction

Answer 61

the posterior ligament is torn (retrodisca lamina) resulting the moving of the jaw posteriorly (lock jaw)

Question 62

TMJ

Answer 62

joint

Question 63

causes of TMD (dysfunction)

Answer 63

- bruxism -stress, emotional - forward head posture CNS sensitization

Question 64

bruxism

Answer 64

grinding at night