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Anatomy 1 > 5- TMJ > Flashcards

5- TMJ Flashcards

1
Q

What does TMJ stand for?

A

Temporomandibular joint

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2
Q

What is the TMJ?

A

the Articulation between the Condyle of the Mandible Bone

and

Glenoid (Mandibular) fossa of the Temporal Bone

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3
Q

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

A

Articular eminence

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4
Q

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

A

1- medial pole

2- lateral pole

for muscular attachment

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5
Q

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

A

synovial

bi-condyloid joint

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6
Q

What sort of fine motor is TMJ involved in?

A

Mastication-chew

Phonation- speaking

Deglutition- swallowing

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7
Q

Label

A
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8
Q

Label

A
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9
Q

Name the two accessory TMJ strucutres.

A

1- Fibrocartilagenous disc

2- Bilaminar Retrodiscal Pad

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10
Q

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

A

1- superior cavity

2- inferior cavity

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11
Q

Where is the Inferior cavity related inferior joint formed?

A

Inferior Joint is formed:

between Condyle of Mandible

and

Inferior aspect of the Fibrocartilagenous Disc

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12
Q

Where is the superior cavity related Superior Joint located?

A

Superior Joint is formed:

between Temporal Articular Eminence

and

Superior Aspect of the Fibrocartilagenous Disc

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13
Q

What is the Bilaminar Retrodiscal Pad?

A

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

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14
Q

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

A

1-superior lamina

2- inferior lamina

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15
Q

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

A

Elastin Fibers

Allows deformation and recoil

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16
Q

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

A

Results in an anterior translation of the TM disc

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17
Q

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

A

Inferior lamina is stiff

It is stiff to resist excessive Anterior translation of TM disc

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18
Q

Label

A
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19
Q

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

A

Superior Capsule

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20
Q

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

A

Inferior Capsule

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21
Q

Name the three ligaments related to TMJ.

A

TM Ligament

Stylomandibular Ligament

Sphenomandibular Ligament

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22
Q

What is the TM ligament?

A

a Ligament that attaches from the

Zygomatic Arch

to

Inferior portion of the Condyle of the Mandible

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23
Q

What is the function of the TM ligament?

A

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

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24
Q

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

A

Sylomandibular ligament is the weakest

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25
Q

What is the function of Sphenomandibular Ligament?

A

Sphenomandibular LIgament serves to limit Anterior translation of Mandibular condyle

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26
Q

What are the 5 TMJ movements?

A

1- Elevation

2- Depression

3- Protrusion

4- Retrusion

5- Lateral excursion aka deviation

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27
Q

Label

A
28
Q

Label

A
29
Q

Functionally, Mastication requires how many ‘mm’s of ROM?

A

18 mm

30
Q

Describe briefly what happens during Depression?

A

Lateral Pterygoid aka Superior Head applies anterior force to the disc

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

31
Q

Describe briefly what occurs during Elevation.

A

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

32
Q

Where does Protusion and Retrusion motion occur?

A

Superior TMJ

33
Q

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

A

Protrusion

34
Q

What action involves Posterior and Superior slide?

A

Retrusion

35
Q

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

A

compliance of the Bilaminar Retrodiscal Pad

36
Q

What is the Normal ROM of Lateral Excursion?

A

8-11mm

37
Q

During Lateral Excursion the Ipsilateral condyle spins around what axis?

A

y-axis

38
Q

During Lateral Excursion the Contralateral condyle slides anteriorly along what?

A

along the articular eminence

39
Q

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

A

spin

and

ipsilateral lateral glide

40
Q

What are the primary Muscles of Mastication?

A

Temporalis

Masseter

Lateral Pterygoid

Medial Pterygoid

41
Q

What is the function of Temporalis?

A

Elevation and Retrusion

42
Q

What are the two attachment site for Temporalis?

A

Attaches to temporal fossa and coronoid process

43
Q

What innervates the Temporalis?

A

Mandibular branch of Trigeminal nerve

44
Q

Which muscle involved in Mastication causes elevation and protrusion?

A

Masseter

45
Q

what is the attachment site of Masseter?

A

Zygomatic arch angle of Mandible

46
Q

What innervates the Masseter muscle in Mastication?

A

Innervated by Mandibular branch of Trigeminal nerve

47
Q

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

A

Depression and Protrusion

48
Q

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

A

pteragoid plate to Neck of mandible

49
Q

What innervates the inferior head aka Lateral Pterygoid?

A

innervated by mandibular branch of Trigeminal nerve

50
Q

What is the function of the Medial Pterygoid?

A

Elevation and Protrusion

51
Q

What are all the attachment sites of Medial Pterygoid

A

Lateral pteragoid plate

lateral palatine

supero-lateral maxilla

medial mandible

52
Q

What is Medial Pterygoid innervated by?

A

Mandibular branch of Trigeminal nerve

53
Q

What are the two secondary muscles of Mastication?

A

Suprahyoids

and

Infrahyoids

54
Q

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

A

Mandibular depression

digastric

mylohyoid

geniohyoid

stylohyoid

55
Q

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

A

Stablizes the Hyoid

omohyoid

sternohyoid

sternothyroid

thryohyoid

56
Q

Label

A
57
Q

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

A

It doesn’t move in the fossa

58
Q

How many degrees of freedom does the TMJ offer?

A

3

Lateral

Superior/Inferior

Protruding/Retracting

59
Q

What does phonation and deglutinition mean?

A

articulating sound

swallowing

60
Q

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

A

TMJ some lateral sliding movement

61
Q

Where is the location where the mandible moves?

A

anteriorly on the articular eminence

62
Q

What sort of structure is the BIlaminar retrodiscal pad?

A

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

63
Q

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

A

recoil back to postion

64
Q

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

A

the lack of ligaments

65
Q

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

A

V3

66
Q

What muscle is parallel to Masseter?

A

Medial Pterygoid

67
Q
A

Anatomy 1 (9 decks)

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