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What type of joint is the TMJ and what does it articulate with?
synovial joint (hinge-like, but not true hinge bc it allows some gliding)
- mandible articulates with the temporal bone of the cranium
- (ant. to ear and at the posterior superior end of jaw)
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What is the inferior aspect of the TMJ composed of?
condyle (head) of the mandible
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What are the 5 mandibular mvmts?
- elevation
- depression
- protraction
- retraction
- lateral deviation
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What 3 things is the superior aspect of the TMJ composed of?
- articular eminence (tubercle)
- mandibular fossa (articular)
- post glenoid spine (tubercle)
*just ant. to ext. auditory meatus
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What is located inbetwen the inf. and sup. aspects?
fibrocartilaginous articular disc
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What are the 3 sections of the fibrocartilaginous articular disc?
- upper jt. space
- lower jt. space
- articular disc (the actual disc itself)
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The TMJ is involved with what functions?
- talking
- chewing
- biting
- swallowing
- yawning
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What are the 4 muscles of the TMJ?
- temporalis
- masseter
- lateral pterygoid
- medial pterygoid
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What is the extensive, fan-shaped muscle thats very poweful masticator muscle, and can be easily seen and felt during hte closure of the mandible?
temporalis
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What is the OIAN of the temporalis?
- O-temporal fossa
- I-coronoid process and ramus of manible
- A- bilat.:elevation, retraction... unilat.:ipsilateral lateral deviation
- N- trigeminal nerve (5)
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What muscle covers the lateral aspect of the jaw and you can feel by placing fingers on your cheeks and clenching jaw (proximal to skin)?
masseter
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What is the OIAN of the masseter?
- O- zygomatic arch of temporal bone and zygomatic process of maxilla
- I- angle of ramus and coronoid process of mandible
- A- bilat.:elevation, unilat.:ipsilateral lateral deviation
- N- trigeminal nerve (5)
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What are the muscles that have 2 heads of origin?
- lateral pterygoid
- medial pterygoid
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What is the OIAN of the lateral pterygoid?
- O- lateral pterygoid plate and greater wing of sphenoid
- I- mandibular condyle and articular disc
- A- bilat.: depression, protrusion, unilat.: contralateral lateral deviation
- N- trigeminal nerve (5)
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What is the OIAN of the medial pterygoid?
- O- lateral pterygoid plate of sphenoid bone and tuberosity of maxilla
- I- ramus and angle of mandible
- A- bilat.: elevation, protraction, unilat.: contralateral lateral deviation
- N- trigeminal nerve (5)
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