Temporal Region: Muscles of Mastication Flashcards

1
Q

what are the 4 true muscles of mastication

A

temporalis, masseter, medial and lateral pterygoid

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2
Q

what are the 4 accessory muscles of mastication

A

digastric muscle, buccinator, tongue muscles and orbicularis oris

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3
Q

what are the 3 jaw closers

A

temporalis, masseter, and medial pterygoid

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4
Q

what is the jaw protractor

A

the lateral pterygoid

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5
Q

what is the jaw opener muscle

A

digastric muscle

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6
Q

where does V3 mandibular nerve emerge into

A

the infratemporal fossa

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7
Q

what are the 3 sensory parts of V3 mandibular nerve

A

inferior alveolar nerve: lower jaw and teeth, buccal nerve: interior mouth, and lingual nerve: anterior 2/3 tongue

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8
Q

what are the 2 motor parts of V3 mandibular nerve

A

muscles of mastication and tensor veli palatine muscle and nerve to mylohyoid: anterior belly of digastrics and mylohyoid muscle

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9
Q

what parasympathetics from CN7 do V3 carry

A

preganglionic parasympathetics from chorda tympani to submandibular ganglion and lingual nerves to submandibular and sublingual glands

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10
Q

what are the 4 movements of the temporomandibular joint

A

depression, elevation, protrusion, and retraction

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11
Q

what innervates the anterior belly of the digastric muscle

A

mandibular V3 nerve

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12
Q

what innervates the posterior belly of the digastric muscle

A

facial nerve 7

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13
Q

what are the 3 cranial nerves involved in general sensation of mastication

A

maxillary nerve (V2), mandibular nerve (V3) and glossopharyngeal nerve (9)

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14
Q

what motion does mastication involve

A

a roughly circular jaw motion

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15
Q

what does the maxillary nerve V2 give sensation to

A

hard palate and upper teeth

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16
Q

what does the mandibular nerve (V3) give sensation to

A

sensory from anterior 2/3 of tongue and lower teeth

17
Q

what does the glossopharyngeal nerve (CN9) give sensation to

A

sensory from posterior 1/3 of tongue

18
Q

how does the jaw open/depress

A

with gravity and neck muscles

19
Q

how does the jaw protrude

A

the mandibular condyle slides anteriorly by the lateral pterygoid (CN V3)

20
Q

what helps position the food

A

tongue (CN 12) and cheek muscles (buccinator CN7)

21
Q

how does the jaw contract/move towards the chewing side

A

by contraction of the chewing side masseter (CN V3) and contralateral medial pterygoid (CN V3)

22
Q

what happens with the power stroke

A

the jaw elevates (masseter, temporalis, and medial pterygoid) and the jaw moves toward the non-chewing side (contralateral masseter, chewing side medial pterygoid)

23
Q

what are the 3 ligaments that support the mandible and limit the TMJ ranges of motion

A

sphenomandibular, temporomandibular, and stylomandibular

24
Q

how many synovial cavities are in the TMJ

A

two: superior and inferior synovial cavities

25
where is the condyle when the jaw is closed
below the fossa
26
where is the condyle when the jaw is opened
under the tubercle
27
what 2 actions are required for a full gap opening
both sliding and hinge actions
28
what are 3 symptoms of TMJ dysfunction
pain in preauricular region and muscles of mastication, limit range of movements, and clicking sounds