Temporomandibular Joint Flashcards Preview

705 > Temporomandibular Joint > Flashcards

Flashcards in Temporomandibular Joint Deck (43)
Loading flashcards...
1

muscle activation + joint motion =

joint loading

2

How is the position of the TMJ joint maintained?

position maintained by: muscles, ligaments, and the TM joint capsule

3

M-L length is __x that of the A-P

2X

4

Where is the TMJ palpated?

Palpated at the lateral pole just anterior to the external auditory meatus

5

What are the 2 joint surfaces covered by?

fibrocartilage

6

The articular surface are both ________ ( -->incongrutent joint)

convex

7

What is the articular disc interposed between?

the joint surfaces

8

The inferior TM joint cavity is made up of the:

mandibular condyle and inferior surface of the disc

9

The inferior TM joint cavity is considered a _______ joint.

hinge

10

The superior TM joint cavity is made up of the:

articular eminence and superior surface of the disc

11

The superior TM joint cavity is considered a _____ joint.

gliding

12

What are three properties of the articular disc?

1) bi-concave fibrocartilage disc
2) avascular and insensate
3) thin in the central portion and thickens anterior and posterior

13

Name 5 functions of the articular disc:

1) congruency for joint articulations
2) stability
3) minimizes loss of mobility
4) reduces friction
5) decreases stress on the TMJ

14

Is the lateral ligament of the TMJ complex the primary or secondary ligament?

primary

15

What function does the lateral ligament serve?

stabilizes the lateral aspect of the capsule
and
guides the condylar movement during mouth opening

16

What is normal ROM for depression and elevation

40-50mm

17

What is normal ROM for lateral deviation?

10-12 mm

18

What is normal ROM for protrusion

6-9mm

19

What is normal ROM for retrusion

3mm

20

What muscles aid in depression?

suprahyoids and lateral pterygoind (inferior head)

21

What muscles aid in elevation?

temporalis, masseter, medial pterygoid

22

What muscles aid in lateral deviation?

medial & lateral pterygoid to opposite side (contralateral movement) and temporalis to same side (ipsilateral)

23

What muscles aid in retrusion?

bilateral temporalis and suprahyoids

24

What is the depression/ opening of the mouth responsible for?

key for may functional activities

25

What is the elevation/ closing of the mouth responsible for?

essential for grinding food

26

What is the lateral deviation of the mouth responsible for?

-side to side translation
-grinding motion associated with chewing

27

What is the protrusion of the mouth responsible for?

(Mandible translates anteriorly)
Integral aspect of maximal opening of mouth

28

What is the retrusion of the mouth responsible for?

(madible translates posteriorly)
Essential for functional activities

29

The first 11* of arthrokinematic motion of the TMJ includes ______?

rotation
The condyle rolls relative to the inferior surface of the disc in the inferior joint

30

True or false? The translation of the condyle and disc along the articular eminence in the superior joint normal should occur together?

True