5- TMJ Flashcards Preview

Anatomy 1 > 5- TMJ > Flashcards

Flashcards in 5- TMJ Deck (67):
1

What does TMJ stand for?

Temporomandibular joint 

2

What is the TMJ?

the Articulation between the Condyle of the Mandible Bone

and 

Glenoid (Mandibular) fossa of the Temporal Bone

3

Where does the Mandibular condyles actually articulate with, which is found anterior to the glendoid fossa?

Articular eminence

4

Each condyle of the Mandible has two parts what are they and waht's it designed for?

1- medial pole

2- lateral pole 

for muscular attachment

5

The TMJ is designated as a ___________, bi-__________ joint

synovial 

bi-condyloid joint

6

What sort of fine motor is TMJ involved in?

Mastication-chew

Phonation- speaking

Deglutition- swallowing

7

Label

Q image thumb

A image thumb
8

Label

Q image thumb

A image thumb
9

Name the two accessory TMJ strucutres.

1- Fibrocartilagenous disc

2- Bilaminar Retrodiscal Pad

10

What does the Fibrocartilagenous disc separate the joint into (2)?

1- superior cavity

2- inferior cavity

11

Where is the Inferior cavity related inferior joint formed?

Inferior Joint is formed:

between Condyle of Mandible 

and

Inferior aspect of the Fibrocartilagenous Disc

12

Where is the superior cavity related Superior Joint located?

Superior Joint is formed:

between Temporal Articular Eminence

and

Superior Aspect of the Fibrocartilagenous Disc

13

What is the Bilaminar Retrodiscal Pad?

Fat pad that attaches to the posterior aspect of the TM disc

14

What is the Bilaminar Retrodiscal Pad made of(2)?

1-superior lamina

2- inferior lamina

15

What does the Superior Lamina contain a large quantity of and what is the function of that substance?

Elastin Fibers

Allows deformation and recoil

16

What happens when there's an issue with the superior lamina?

Results in an anterior translation of the TM disc

17

What is a physical propery of the Inferior Lamina and what is the function realted to its physical property?

Inferior lamina is stiff

It is stiff to resist excessive Anterior translation of TM disc

18

Label

Q image thumb

A image thumb
19

In the Upper TMJ the ______ __________ is lax allowing for more mobility.

Superior Capsule

20

The _________ __________ is tight which keeps the disc firmly attached to the Mandibular Condyles

Inferior Capsule

21

Name the three ligaments related to TMJ.

TM Ligament

Stylomandibular Ligament

Sphenomandibular Ligament

22

What is the TM ligament?

a Ligament that attaches from the

Zygomatic Arch 

to

Inferior portion of the Condyle of the Mandible

A image thumb
23

What is the function of the TM ligament?

limiting of the downward, posterior, and rotary movement of the Mandibular condyle

24

What is unique about the Stylomandibular LIgament out of all three TMJ related ligaments?

Sylomandibular ligament is the weakest

25

What is the function of Sphenomandibular Ligament?

Sphenomandibular LIgament serves to limit Anterior translation of Mandibular condyle

26

What are the 5 TMJ movements?

1- Elevation

2- Depression

3- Protrusion

4- Retrusion

5- Lateral excursion aka deviation

27

Label

Q image thumb

A image thumb
28

Label

Q image thumb

A image thumb
29

Functionally, Mastication requires how many 'mm's of ROM?

18 mm

30

Describe briefly what happens during Depression?

Lateral Pterygoid aka Superior Head applies anterior force to the disc 

this is to ensure adequate Anterior translation of Condyle/Disc occurs

A image thumb
31

Describe briefly what occurs during Elevation.

Lateral Pterygoid aka Superior Head controls Posterior translation of the disc until the condyle has reached its max Posterior rotation

32

Where does Protusion and Retrusion motion occur?

Superior TMJ

33

What action causes Anterior and Inferior slide of the condyle and disc along the 'sloping articular eminence'?

Protrusion

34

What action involves Posterior and Superior slide?

Retrusion

35

What allows for the anterior translation of the disc needed for full Protrusion ROM?

compliance of the Bilaminar Retrodiscal Pad

36

What is the Normal ROM of Lateral Excursion?

8-11mm

37

During Lateral Excursion the Ipsilateral condyle spins around what axis?

y-axis

38

During Lateral Excursion the Contralateral condyle slides anteriorly along what?

along the articular eminence

39

a small degree of ____ and _____ _______ ______ are required on the contralateral side to obtain full ROM of Lateral Excursion

spin 

and

ipsilateral lateral glide

40

What are the primary Muscles of Mastication?

Temporalis

Masseter

Lateral Pterygoid

Medial Pterygoid

A image thumb
41

What is the function of Temporalis?

Elevation and Retrusion

A image thumb
42

What are the two attachment site for Temporalis?

Attaches to temporal fossa and coronoid process

A image thumb
43

What innervates the Temporalis?

Mandibular branch of Trigeminal nerve

44

Which muscle involved in Mastication causes elevation and protrusion?

Masseter

A image thumb
45

what is the attachment site of Masseter?

Zygomatic arch angle of Mandible

46

What innervates the Masseter muscle in Mastication?

Innervated by Mandibular branch of Trigeminal nerve

47

The inferior head involved in Mastication is aka Lateral Pterygoid. What is it's function?

Depression and Protrusion

A image thumb
48

What are the attachment sites for Lateral Pterygoid aka inferior head?

pteragoid plate to Neck of mandible

A image thumb
49

What innervates the inferior head aka Lateral Pterygoid?

innervated by mandibular branch of Trigeminal nerve

50

What is the function of the Medial Pterygoid?

Elevation and Protrusion

51

What are all the attachment sites of Medial Pterygoid

Lateral pteragoid plate

lateral palatine

supero-lateral maxilla 

medial mandible

52

What is Medial Pterygoid innervated by?

Mandibular branch of Trigeminal nerve

53

What are the two secondary muscles of Mastication?

Suprahyoids 

and

Infrahyoids

54

What is the function of Suprahyoids and name all four of them

Mandibular depression

digastric

mylohyoid

geniohyoid

stylohyoid

A image thumb
55

What is the function of Infrahyoid and name all four muscles.

Stablizes the Hyoid

omohyoid

sternohyoid

sternothyroid

thryohyoid

56

Label

Q image thumb

A image thumb
57

Between the Condyles of the mandible and glenoid (Mandibular) fossa of the temporal bone, does it or does it not move in the fossa?

It doesn't move in the fossa

58

How many degrees of freedom does the TMJ offer?

3

Lateral

Superior/Inferior

Protruding/Retracting

59

What does phonation and deglutinition mean?

articulating sound

swallowing

60

All human movement is rotary movements on an axil but one where is it and what sort of motion it it?

TMJ some lateral sliding movement

61

Where is the location where the mandible moves?

anteriorly on the articular eminence

62

What sort of structure is the BIlaminar retrodiscal pad?

they are laminar which means layered and it has two layers therefore bilaminar in name. One is superior and the other is inferior

63

What does the elastin fibers in the Bilaminar Retrodiscal pad what to do?

recoil back to postion

64

Why allows for the superior capsule to be lax in the upper TMJ?

the lack of ligaments

65

Which Trigeminal Cranial Nerve innervates Temporalis, Lateral Pterygoid, Medial Pterygoid and Messeter?

V3

66

What muscle is parallel to Masseter?

Medial Pterygoid

67