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The muscles of mastication and the TMJ

the-muscles-of-mastication-and-the-tmj

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What type of joint is the TMJ?

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What is the main function of the articular disc?

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Attaches the

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muscle to the

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aspect of the joint

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How does the articular disc stabilise the TMJ?

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It is pulled

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by the lateral pterygoid when the head of the

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is on the

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to

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the joint

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How can the TMJ dislocate?

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If the condyle

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the

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Name the three main ligaments of the TMJ.

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What are the functions of the ligaments of the TMJ?

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They control the

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of

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of the TMJ and they are also

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List the unique features of the TMJ.

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The articular cartilage is made of

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The articular disc

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the joint into

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The right and left TMJ's are

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by the mandible, so movement of one side requires movement of the

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What muscles are involved in mastication?

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Match the muscles to their functions in mastication.

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temporalis
masseter
lateral pterygoid
medial pterygoid
suprahyoids and infrahyoids

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elevates mandible (p)
protrudes mandible
depress mandible
elevates mandible (m)
elevates and retracts mandible

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What forms the temporomandibular joint?

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The underside of the

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bone and the head of the

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When is the TMJ stable?

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When it is in the

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If it is in the

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then it is unstable

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When are the extreme ranges of movement possible for the TMJ used?

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When

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Match the range of movement to the mandibular movement for normal speech.

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Match the text
Opening
Protrusion
Retraction

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<1cm for lip support, e.g. bilabials
<1cm, e.g. alveolar phonemes and fricatives
~2cm, e.g. plosives

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Where can the TMJ dislocate?

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It can only dislocate

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