TMJ Flashcards
when the jaw opens wide what stops it from going into the neck?
Hinge and slide motion
what kind of joint is between the temporal bone and the mandible?
synovial joint
Name this part of a synovial joint
joint capsule
Name this part of a synovial joint
synovial membrane
Name this part of a synovial joint
hyaline articular cartilage
Name this part of a synovial joint
synovial fluid
what is the function of the hyaline articular cartilage in a synovial joint?
cushions the surface
movement at the TMJ is limited to? 2
contralateral TMJ
teeth
the TMJ is capable of what 2 movements?
hinge
slide
the TMJ is capable of hinge and slide movements so its called a ? joint
ginglymoarthroidial joint
name this bone that’s part of the TMJ
temporal bone
name this part of the TMJ
glenoid fossa
name this part of the TMJ
articular eminence
name this bone that’s part of the TMJ
zygomatic bone
name this part of the TMJ
condyle
the glenoid fossa is thin so what happens to the masticatory forces?
transmitted through the teeth
which side of the condyle is wider?
medial
how is the TMJ a special synovial joint? 2
2 compartments
fibrous cartilage not hyaline cartilage
name this part of the TMJ
joint capsule
the joint capsule is attached to what?
the glenoid fossa
the joint capsule is continuous with what?
the disc
what are the 2 layers of the joint capsule
outer fibrous layer
inner synovial membrane
what is the function of the synovial membrane?
secretes synovial fluid to fill joint spaces
what does the synovial fluid do? 3
contains proteoglycans
lubricant
nutritive
name this part of the TMJ
lateral ligament
the lateral ligament connects? 2
lateral surface of articular eminence to posterior surface of condyle
what does the lateral ligament do?
restricts movement
what is a raphe?
union between 2 muscles
Name this accessory ligament
Stylomandibular ligament
Name this accessory ligament
Sphenomandibular ligament
Name this accessory ligament
Pterygomandibular raphe
Which accessory ligament is important when giving anaesthesia and why??
Sphenomandibular ligament as runs close to alveolar bone
Name this structure of TMJ
Articular disc
What is the articular disc? 2
Dense fibrous disc
Divides joint into 2 compartments
What r the 3 zones of the articular disc?
Anterior extension
Posterior extension
Disc
What r the three zones of the disc part of the articular disc?
Posterior band
Intermediate band
Anterior band
How many parts does the anterior extension of the articular disc have?
1
The anterior extension of the articular disc is continuous with what?
Superior head of lateral Pterygoid muscle
How many parts does the posterior extension of the articular disc have?
2
What r the two parts of the posterior extension of the articular disc?
Upper layer: vascular and elastic
Lower layer: fibrous
The posterior extension is ? 2
Densely innervated
Vascular
Why does clicking at the TMJ not normally cause pain?
The joint capsule is richly innervated but not in the disc
What is nociception?
Process of activating nerves that give rise to the sensation of pain
What is proprioception?
Process of knowing where your body is
Which nerve innervates the TMJ
Trigeminal, mandibular division
CNV3
Which branches of CNV3 supply the TMJ? 3
Auriculotemporal
Masseteric
Deep temporal
Which arteries supply the TMJ with blood? 2
Superficial temporal artery
Maxillary artery
Name this part of the articular disc of TMJ
Posterior extension
Name this part of the articular disc of TMJ
Posterior band
Name this part of the articular disc of TMJ
Intermediate zone
Name this part of the articular disc of TMJ
Anterior band
Name this part of the articular disc of TMJ
Anterior extension
The articular disc divides the joint into what 2 compartments?
Lower hinge
Upper slide
What causes a clicking sound from TMJ?
Anterior disc displacement
