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MCQ 1.2 > TMJ > Flashcards

TMJ Flashcards

1
Q

What does the upper joint cavity allow for

A

Gliding/translational movements

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2
Q

What does the lower joint cavity allow for

A

Hinge/rotational movements

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3
Q

What is ginglymoarthroidal

A

Joint space which is divided into two joint cavities by an intra articular disc

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4
Q

What lines the joint cavity and capsule

A

Synovial membrane

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5
Q

What type of cartilage covers the articular surfaces

A

Fibrous tissue and fibrocartilage

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6
Q

What type of joint is the TMJ

A

Syndesmosis joint type

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7
Q

What are the 6 layers going up from the bone of the condylar head

A

Layer of calcified cartilage
Fibrocartilaginous layer
Cell rich layer
Fibrous articular surface layer
Lower joint space
Intra articular disc

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8
Q

What are the 4 main layers of the articular surface of condyle

A

Superficial articular surface
Cell rich layer
Fibrocartilaginous layer
Calcified cartilage

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9
Q

What is the superficial articular surface layer consist of

A

Fibrous tissue mostly collagen some elastin

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10
Q

What is different between the collagen fibres in the superficial layers

A

Parallel to the surface
Vertical in deeper layers

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11
Q

What is the calcified cartilage layer

A

Remnant of secondary cartilage

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12
Q

What are the 4 alternating layers of hyaline cartilage and dense collagen fibres

A

Outer fibrous cell layer
Proliferative cell layer
Chondrocytic cell layer
Hypertrophic cell layer

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13
Q

What type of collagen is cartilage

A

Type II

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14
Q

What type of collagen is the fibrocartilage disc

A

Type I

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15
Q

Where does the joint capsule extend and what does it hold in

A

Holds in synovial fluid
Fibrous capsule
Extends from margins of glenoid fossa to envelop entire head of condyle before fusing inferiority with periosteum of condylar process

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16
Q

What is different about the upper and lower fibres of the joint capsule

A

Upper are more loosely arranged

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17
Q

What does the synovial membrane line

A

Inner surface of fibrous capsule and margins of intra articular disc but does not cover articular surfaces of joint

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18
Q

What is the intervening disc essentially a continuation of

A

The lateral pterygoid through joint cavity

19
Q

What is the meniscus disc attached to

A

Capsule expect posteriorly it is fixed to the posterior aspect of the glenoid fossa

20
Q

What does the upper division of the meniscus disc attach to

A

Temporal bones postglenoid process

21
Q

What does the lower division of the meniscus disc attach to

A

The neck of condyle

22
Q

Where are blood vessels present in the meniscus disc

A

Only at periphery of intra articular disc, bulk of it being avascular

23
Q

What is the composition of the disc

A

Water
Macromolecules
Collagen
Cells
ECM components

24
Q

What is the retrodiscal tissue

A

Aka bilaminar zone
Upper temporal/superior lamina is elastic
Lower condylar/inferior lamina non elastic
Loose connective tissue in between
Highly vascular and innervated

25
Q

What is the discs appearance when relaxed

A

Thin and wrinkled

26
Q

What does the capsule act as

A

A limiting membrane

27
Q

What happens during the movement of the disc

A

It will straighten out as it is pulled anteriorly along with anterior aspect of condylar head

28
Q

What is the lateral ligament

A

When the disc moves the lateral aspect is thickened

29
Q

What do the ligaments on the disc do

A

Non elastic collagenous structures which restrict distance by which bones that form articulation can be separated without causing tissue damage

30
Q

What is the lateral ligament called

A

Temporomandibular ligament

31
Q

What does the temporomandibular ligament prevent

A

Excess posterior movement of TMJ

32
Q

What is the insertion of the temporomandibular ligament

A

Posterior and lateral aspect of the head of condyle

33
Q

What does the temporomandibular ligament go over

A

The top of the capsule to reinforce it

34
Q

What is the origin of the temporomandibular ligament

A

Is it fan shaped
Entire lateral aspect of glenoid fossa on each joint

35
Q

What do ligaments of the TMJ help prevent

A

Both medial and lateral dislocation as well as limit posterior displacement of head of condyle to prevent excessive retraction of mandible

36
Q

What does the sylomandibular ligament do

A

Limits excessive protrusion

37
Q

What does the sphenomandibular ligament do

A

Support mandible in some rotations

38
Q

Where is the origin and insertion of the sphenomandibular ligament

A

From bony lingula at opening of mandibular foramen on medial aspect of ramus to angular spine of sphenoid bone

39
Q

What is the origin and insertion for the stylomandibular ligament

A

Runs from spine of styloid process to angle of mandible

40
Q

What is the TMJ innervated by

A

Auriculotempoarl, masseteric and deep temporal nerve of V3

41
Q

What is the blood supply of the TMJ

A

Mainly superficial temporal and maxillary arteries via external carotid artery

42
Q

What does the auriculotemporal nerve supply

A

Medial, lateral and posterior parts of TMJ

43
Q

What does the masseteric and deep temporal nerves supply

A

Anterior part of TMJ

44
Q

What is Hiltons law

A

Muscles acting on joint have same nerve supply as joint

MCQ 1.2 (34 decks)

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