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Anatomy > Temporomandibular Joints > Flashcards

Temporomandibular Joints Flashcards

1
Q

What is the glenoid fossa

A

Base of skull

Where head of condyle articulates the temporal bone

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2
Q

What is the anterior margin of the TMJ

A

Articular tubercle which prevents TMJ dislocating Anteriorly

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3
Q

What is a typical joint

A

2 bones lined with hyaline cartilage
Articular surfaces lined with hyaline cartilage
Non-articular surface lined with synovial mem which nourishes , reduces friction, cools the joint, remove waste

Has a capsule to enclose the joint and retain fluid
Ligaments to strengthen the joint
Skeletal ,us les move joint

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4
Q

What is a unique synovial joint

A

TMJ
Articular surfaces all fibrous tissue
Temporal bone covered in periosteum
Intra articular disc made of dense fibrous tissue
Head of mandibular condyle covered in perichondrium

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5
Q

What is the lingula

A

At opening of mandibular foramen
Passing down through foramen is the inferior alveolar nerve form Vc

Links formed by powerful ligament attachment of sphenomandibular ligament

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6
Q

What is the retro molar triangle

A

Area of bone depression
After 3rd molar
Imp for pterygomandibular raphe

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7
Q

What su the pterygoid fovea

A

Lateral pterygoid muscle attachment

Muscle of mastication

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8
Q

What is the transverse crest of the condyle head

A

Angulation dividing condylar head into posterior and anterior condylar facets

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9
Q

What is the head of the condyle like

A

Tilted Anteriorly
Flattened A-P
Elongated latero-medially
Long axis points Posteriorly

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10
Q

What does the lateral temporomansibular ligament do

A

Prevent dislocation Posteriorly

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11
Q

What does the joint capsule do

A

Attaches around circumferences of articular surfaces

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12
Q

What are the attachment points of stylomandibulad ligament

A

Styloid process to medial aspect of angle of mandible

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13
Q

What is the stylomandibulad ligament a specialisation of

A

Deep cervical fascia - investing layer

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14
Q

What is the sphenomandibular ligament

A

Remains meckels cartilage

From spine of sphenoid to lingula on mandible

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15
Q

What are the attachments of the pterygomandibular raphe

A

Pterygoid hamulus to retro molar triangle ( Buccinator origin)

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16
Q

What does the intra articular disc do with the joint capsule

A

Merge with joint capsule around its circumference ensuring separation of joint into 2 discrete spaces upper and lower spaces

17
Q

What does the intra articular disc do for movement of TMJ

A

Provides stability of joint during movement by improving ‘fit’ between the bony articulating surfaces

18
Q

What is the intra articular disc made up of

A

Dense fibrous connective tissue

19
Q

How many zones are associated in he intra articular disc

A

5 zones

20
Q

What is the anterior extension of the intra articular disc

A

Continuous with joint capsule Anteriorly and with tendon of lateral pterygoid muscle

21
Q

What is the posterior extension of the intr articular disc

A

Bilaminar
Upper layer - elastic fibres assist disc returning to rest
Both layers - vascular tissue which engirge with blood on opening and empties into pterygoid venous plexus on closing

22
Q

What are the final 3 layers of the intra articular disc

A

3 bands in disc proper
Anterior thick
Intermediate thin
Posterior thick

23
Q

What are the two joint cavities

A

Upper and lower joint spaces formed by intra articular spaces

24
Q

What happens in initial opening for the TMJ

A

Anterior rotation of head of condyle
Movement occurs in lower joint space
Disc remains in place

25
Q

What happens when the jaw opens fully to dislocation to the TMJ

A

After initial anterior rotation of condyle head in lower joint space
Disc then translates slides Anteriorly articulating with mandibular fossa and articular eminence
Movement occurs in upper joint space

26
Q

What is the name for jaw wide open

A

Internal derangement with reduction

27
Q

What is the movement of TMJ when jaw open

A

Depression bilateral and symmetrical
Initial anterior rotation hinge lower joint space
Anterior translation slide upper joint space

28
Q

What is the movement of TMJ for jaw closing

A

Elevation bilateral and symmetrical
Initial posterior translation upper joint space
Subsequent posterior rotation lower joint space

29
Q

What are the movements of the TMJ in a lateral movement

A

Bilateral and asymmetrical
Working side - lateral rotation
Non-working side - anterior and medial rotation

30
Q

What is the movement of TMJ in protrusion and regression

A

Mandible can pull forward relative to maxilla protrusion

Mandible pull back relative to maxilla retrusiin

31
Q

What kind of joint is the TMJ

A

Synovial

Anatomy (44 decks)

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