Anatomy UE > TMJ > Flashcards

TMJ Flashcards

(70 cards)

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1
Q

physical properties of the Joint Capsule and Lateral Ligaments of the TMJ

A

Thin, synovial joint capsule, reinforced by ligaments

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2
Q

Ligaments and capsule in TMJ important function

A

have sensory role in position and movement information regarding the TMJ

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3
Q

Lateral temporomandibular ligament prevents what kind of movment

A

Prevents excessive A-P and lateral movements

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4
Q

Lateral temporomandibular ligament is the Main suspension ligament during

A

during moderate opening
- talking, taking a drink

this is the most important for maintaining the suspension of the manible

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5
Q

Medial Ligaments of the TMJ

A

Sphenomandibular ligament
Stylomandibular ligament

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6
Q

Sphenomandibular ligament

A

Suspends mandible during wide opening

Screaming, eating an apple

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7
Q

Stylomandibular ligament

A

Acts as a stop to extreme opening
Keeps it from dislocation or sublexing

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8
Q

Articular Disc of the TMJ structure

A

Fibrocartilaginous structure

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9
Q

Articular Disc of the TMJ properties

A

Avascular, Aneural
Shock absorber, improves congruency of joint surfaces, improves stability

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10
Q

Articular Disc of the TMJ posterior and ant attachments

A

capsule ant
through bilaminar zone post

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11
Q

Articular Disc of the TMJ medial and lateral attachments

A

Inserts medially and laterally into poles of the condyle via medial and lateral collateral ligaments

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12
Q

Bilaminar zone other name

A

retro-discal tissue

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13
Q

Bilaminar zone attaches to

A

posterior capsule and to anterior tympanic plate.

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14
Q

Bilaminar zone function

A

Keeps disc from moving too far anteriorly.

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15
Q

Bilaminar zone is found where

A

Tissue right behind the disc

Maintains connection between the disc and posture part of the capsule

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16
Q

articular disc movement Properties

A

We want some movement of the disc – do not want to much movement

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17
Q

Articular Disc and pterygoid

A

Superior belly of lateral pterygoid attaches anteriorly to disc

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18
Q

what kind of movement does that articular disc control

A

Controls posterior movement during mouth closing

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19
Q

disc fowards or backwards when the mouth opens

A

forwards

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20
Q

disc forward or backwards when the mouth closes

A

backwards

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21
Q

TMJ Innervation

A

Innervation: V3 (mandibular branch of trigeminal nerve)

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22
Q

TMJ Vasculature

A

Blood supply: branches of external carotid
Mostly superficial temporal artery

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23
Q

Jaw Movements

A

Elevation, Depression
Protrusion, Retrusion
Chewing and Grinding

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24
Q

elevation movement

A

closing mouth

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25
depression movement
opening the mouth
26
Protrusion movement
underbite
27
Retrusion movement
overbite
28
Mouth Opening and Closing (Depression and Elevation) axis
Coronal axis, passes through the condyles Sagittal plane motion
29
Phase I of opening the mouth
rotation of condyle in lower compartment. First 11 – 25 mm.
30
Phase II of opening the mouth
translation of disc/condyle together in upper compartment
31
what does Total excursion mean and how much do we see
40 to 50 mm Teeth together --> teeth apart
32
closing and opening the mouth different phases
Closing or elevation occurs in reverse pattern as opening
33
Mandibular Protrusion and Retrusion are both what kind of movement
translation that occurs in the upper compartment
34
what is happening during Protrusion
mandible juts forward, range is about 6-9 mm x2-3then retrusion
35
what is happening during Retrusion
mandible pulls back, range is about 3 mm
36
Mandibular Lateral Deviation axis/es
2 possible axes Vertical axis A-P axis
37
Vertical axis of Mandibular Lateral Deviation
Spin around ipsilateral condyle Translation of contralateral condyle Normal excursion is about 8 mm
38
Lateral deviation at the mandible is what kind of movement
side to side movement
39
A-P axis of Mandibular Lateral Deviation
Swing in frontal plane of ipsilateral condyle Depression (distraction) of contralateral condyle
40
Tightness in right TMJ - what do we do
deviate to the left to cause distraction
41
Masseter Attachments
inferior border & medial surface of zygomatic arch lateral surface of ramus of mandible and coronoid process
42
Masseter Actions
elevates and protrudes mandible; deep fibers retrude it
43
Temporalis Attachments
Temporal fossa and deep surface of temporal fascia Tip and medial surface of coronoid process and ramus of mandible
44
Temporalis actions
elevates mandible posterior fibers retrude mandible after protrusion
45
Lateral Pterygoid Superior Head Attachments
infratemporal surface & crest of greater wing of sphenoid bone
46
Lateral Pterygoid inferior Head Attachments
lateral surface of lateral pterygoid plate
47
Lateral Pterygoid insertions for both inf and sup head
Both heads of lateral pterygoid attach at neck of mandible
48
Lateral Pterygoid insertions for sup head
Superior head also attaches to anterior part of articular disc and capsule of TMJ
49
Lateral Pterygoid action bilarterally
Acting bilaterally, protrude mandible
50
Lateral Pterygoid action unilaterally
Acting alone and alternately, produce side to side movements of mandible
51
Lateral Pterygoid superior head actions
controls posterior movement of articular disc during mouth closing
52
Medial Pterygoid attachments Deep Head
medial surface of lateral pterygoid plate
53
Medial Pterygoid Superficial Head Attachments
tuberosity of maxilla
54
Medial Pterygoid Attachments both heads
Both heads of medial pterygoid attach at medial surface of ramus of mandible
55
Medial Pterygoid actions bilatterally
Acting bilaterally, elevate mandible, & help to protrude mandible
56
Medial Pterygoid actions Acting alternately
produce grinding motion
57
is there is any spefic muscle that depresses the mouth (opens)
no mainly done by gravity help from: Inferior lateral pterygoid Anterior digastric
58
Mandibular Elevators (Closing) muscles
Temporalis Masseter Medial Pterygoid Superior lateral pterygoid plays role by keeping disc slightly forward during closing
59
Right Lateral Deviators
Left Medial and Lateral Pterygoids and Right Posterior Temporalis Muscle
60
Left Lateral Deviators
Right Medial and Lateral Pterygoids and the Left Posterior Temporalis Muscle
61
Protruders
Bilateral Lateral Pterygoids Assist by Medial Pterygoids and Masseter
62
Retruders
Posterior Temporalis Muscle Posterior Digastric Deep Masseter
63
3 primary types of dysfunction in the TMJ
Anterior Displacement with Reduction Anterior Displacement without Reduction Internal Derangement
64
Anterior Displacement with Reduction serveness
Least serve
65
Anterior Displacement with Reduction mechanism
the disc rotates to far anteriorly, stretches bilaminar zone tissue, tissue pulls it back, and then snaps back into place
66
what is heard with Anterior Displacement with Reduction
pop or click this is the dics snapping back into place
67
Anterior Displacement without Reduction mechanism
The disc is ahead of the condyle (ant), there is not click or pop because the disc does not flip back into place
68
Anterior Displacement without Reduction Typically results in
limited opening - the disc is blocking
69
Anterior Displacement without Reduction pt reaction
Pt is very symptomatic
70
Internal Derangement
Meniscus is permently anteriorly displaced in front of condyle the retrodiscal tissue will changes if format and become more disc like in natural
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