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5th - OD - TMD > TMD - Anatomy > Flashcards

TMD - Anatomy Flashcards

1
Q

What does tempo-mandibular joint comprise of?

A

Mandible bone
Temporal bone
Tempromandbiular joint an dmuscles

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2
Q

How do mandible and temporal bone interact?

A

Condyle sits in mandibular fossa in the temporal bone - separated by articular disc

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3
Q

How does condyle move across temporal bone?

A

Condyle and articular disc translate across articular eminence

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4
Q

Where does temporals muscle attach?

A

Coronoid process

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5
Q

What muscles attach mastoid process and what help?

A

Sternocleidomastoid muscle
Digastric muscle
Help open mandible

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6
Q

What surrounds TMD joint?

A

Fibrous articular capsule - reinforced TMD ligaments

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7
Q

What is articular disc made from?

A

Fibrous tissue

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8
Q

Special feature of articular disc?

A

Bioconcave - allows better fit between fossa and condyle

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9
Q

How is articular disc split?

A

Into upper and lower compartment

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10
Q

What movement happens in lower compartment?

A

Condyle rotates below the disc - hinge-like motion

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11
Q

What movement happens in upper compartment?

A

Condyle and disc translate along eminence - disc remain on condyle during movement

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12
Q

Difference between first and second part opening?

A

First 25mm = rotation of condyle in fossa = hinging

Second half = forward translation of condyle along eminence

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13
Q

What muscle pull chin down and back?

A

Digastric and geniohyoid
Geniohyoid - pull down
Digastric - pull down and back

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14
Q

What muscles allow forward translation of condyle?

A

Lateral pterygoid

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15
Q

What muscle pulls condyle back into fossa?

A

Temporalis

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16
Q

What muscles elevate mandible on closing?

A

Temporalis, masseter and medial pterygoid

17
Q

What mm expect of protrusion?

A

10mm

18
Q

What expect see protrusion?

A

Symmetrical forward translation both condyles

19
Q

What muscle cause protrusion

A

Lateral pterygoids

20
Q

What muscles cause retrusion?

A

Temporalis muscle

21
Q

How many mm see lateral excursion?

A

10mm

22
Q

What happens in lateral excursion?

A

Condyle on opposite side is pulled forward due contraction lateral pterygoid

Condyle on same side has minimal rotation - temporals contract same side to hold position

5th - OD - TMD (4 decks)

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