Tmj

Question 0

Secondary curves?

Answer 0

Cervical, lumbar

Anterior convexity

Question 1

Primary curves?

Answer 1

Thoracic, sacral

Posterior convexity

Question 2

What do the condyles of the mandible sit in?

Answer 2

Mandibular Fossa
Post glenoid tubercle (posteriorly)
Articular eminence (Anteriorly)

Question 3

type of joint tmj?

Answer 3

Snyovial

Question 4

Proximal/stationary part of tmj

Answer 4

Temporal bone

Question 5

Primary articular surface of mandibular condyle?

Answer 5

Articular eminence

Question 6

Kind of cartilage Articular eminence has?

Answer 6

Fibrocartilage
Can repair and remodel
High forces when biting

Question 7

Incongruent joint?

Answer 7

Articular eminence (convex) 
Mandible condyles (convex)

Question 8

Inferior tmj joint ?

Type of joint ?

Answer 8

1st joint
Mandibular condyle + inferior surface disc
Hinge joint

Question 9

Superior tmj joint

Answer 9

2nd joint

Articular eminence + superior surface disc

Question 10

What is the disc attached to?

Answer 10

Medial/ lateral poles of condyles

Allow Condyle to rotate freely on disc in anterior/posterior direction

Question 11

Disc attached to anteriorly?

What do they restrict?

Answer 11

Joint capsule
Lateral pterygoid muscle
Restrict posterior translation of disc

Question 12

What is the disc attached to Posteriorly?

Answer 12

Bilaminar retrodiscal pad

Superior/inferior lamina

Question 13

Superior lamina of bilaminar retrodiscal pad allows?

Answer 13

Disc to translate anteriorly (opening)

Assist with closing

Question 14

Inferior lamina of bilaminar retrodiscal pad limits?

Answer 14

Anterior translation

Question 15

If someone dislocates their jaw anteriroly what would be stretched?

Answer 15

Inferior lamina

Question 16

Function of Articular disc? (5)

Answer 16

Increase stability
Min loss of mobility
Reduces friction 
Decreases street 
Collage, glyco, elastin= cannot repair/remodel

Question 17

Where is the capsule loose?

Answer 17

Anterior (mostly)
medial
Posteriorly

Question 18

Where is the capsule strong ?

Answer 18

Laterally

Question 19

TMJ ligament limits?

Answer 19

Downward/ posterior motion of mandible
Rotation during mandibular depression
Lateral displacement

Question 20

What does the stylomandibular lig limit?

Answer 20

Protrusion

Question 21

Osteokinamatics of tmj

Answer 21

Depression 
Elevation
Protrusion
Retrusion
Lateral excursion

Question 22

ROM for depression

Answer 22

40-50 mm

Question 23

What happens in depression?

Answer 23

Anterior roll (condyle/inferior disc) 
Anterior glide (superior disc/ Articular eminence)

Question 24

What happens in elevation ?

Answer 24

``` Posterior roll (condyle/inferior disc) Posterior glide (superior disc/ Articular eminence) ```

Question 25

What controls the disc and attaches anteriorly during elevation ?

Answer 25

Lateral pterygoid | Eccentric control

Question 26

What limits protrusion?

Answer 26

Superior lamina of retrodiscal tissue

Question 27

Protrusion is important for?

Answer 27

Opening/depression

Question 28

Protrusion/Retrusion occur?

Answer 28

In the upper tm joint

Question 29

Retrusion is important for?

Answer 29

Closing your mouth

Question 30

What is retrusion limited by?

Answer 30

Temporomandibular ligament | Compression of retrodiscal area

Question 31

ROM for lateral excursion?

Answer 31

8-11 mm

Question 32

Lateral excursion arthro?

Answer 32

Ipsilateral condyle = spin in transverse plane in Fossa | Contralateral condyle = translates anteriorly along anterior eminence

Question 33

Deviation?

Answer 33

S curve | Mandible moves away from midline then back

Question 34

Deflection?

Answer 34

C curve | Mandible moves away from midline doesnt come back

Question 35

Primary muscles of tmj?

Answer 35

Temporalis Masseter Lateral pterygoid Medial pterygoid

Question 36

Temporalis?

Answer 36

Closing, retrusion | Ipsilateral deviation

Question 37

Masseter?

Answer 37

Closing/retrusion

Question 38

Lateral pterygoid?

Answer 38

Protrusion Contralateral deviation Eccentric control disc upon closing

Question 39

Medial pterygoid ?

Answer 39

Closing Protrusion Contralateral deviation

Question 40

Secondary muscle?

Answer 40

Suprahyoid (mandibular depression) | Infrahyoid (stabalize hyoid)

Question 41

Resting posture of tmj

Answer 41

1.5-5 mm open