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Anatomy 1 > 5- TMJ > Flashcards

5- TMJ Flashcards

(67 cards)

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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
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
28
Label
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
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
41
What is the function of Temporalis?
Elevation and Retrusion
42
What are the two attachment site for Temporalis?
Attaches to temporal fossa and coronoid process
43
What innervates the Temporalis?
Mandibular branch of Trigeminal nerve
44
Which muscle involved in Mastication causes elevation and protrusion?
Masseter
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
48
What are the attachment sites for Lateral Pterygoid aka inferior head?
pteragoid plate to Neck of mandible
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
55
What is the function of Infrahyoid and name all four muscles.
Stablizes the Hyoid omohyoid sternohyoid sternothyroid thryohyoid
56
Label
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

Anatomy 1 (9 decks)

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