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21 Cards in this Set
- Front
- Back
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Trismus
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Spasm of masticatory muscles associated with difficulty opening or locking of the jaw
Caused by: TMJ inflammation TMJ pain dysfunction Mandibular blocks Extraction of wisdom teeth Injuries/traumatic surgeries Tetanus infection |
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Subluxation
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Mandibular disolcation
"Locked Jaw" |
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Depression movement
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Condyles move down and forward
Caused by: LIS Lateral Pterygoid Infrahyoid Suprahyoid |
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Elevation movement
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Condyles move up and backwards
Caused by: MeTMa Medial Pterygoid Temporalis (anterior verticle) Masseter |
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Protrusion movement
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Condyles and disks move down and forward
Caused by: LM Lateral Pterygoid (Major contribution) Medial Pterygoid (minor contribution) |
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Which muscle makes the largest contribution for protrusive movement?
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Lateral Pterygoid
(Medial Pterygoid provides minor contribution) |
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Retrusion movement
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Condyles and disks move up and backward
Caused by: TM Temporalis (posterior horizontal) Masseter (deep head) |
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Contralateral Excursion movement
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Moving the mandible to the opposite side of the muscle in lateral movements
Caused by: Lateral Pterygoid Medial Pterygoid |
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Ipsilateral Excursion movement
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Moving the mandible to the same side as the muscle in lateral movements
Caused by: Masseter Temporalis |
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Lateral Pterygoid
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Involved in depression and protrusion
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Medial Pterygoid
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Involved in elevation and protrusion
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Masseter
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Involved in elevate and protrusion
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Temporalis
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Involved in elevation and retrusion
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Which muscle is involved in retrusion of the jaw?
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Temporalis
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What is the maximum biting force
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120lbs
Becomes stronger with exercise |
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Which teeth have the greatest biting force
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Posterior Teeth
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Which muscle plays the greatest role in masticatory forces
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Masseter muscle
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What stimulates you start chewing
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Taste, smell, touch, temperature
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What nerve innervates the muscles of mastication
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Trigeminal V3 - Mandibular Nerve
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What part of the brain is centrally responsible for the chewing reflex?
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Reticular Formation in the brainstem
Linked to taste and salivary centers |
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Chewing Reflex
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Initiated as soon as bolus of food touches inner surface of mandible
Masticatory muscles are inhibited and the jaw reflexively drops to open Opening of the jaw activates stretch receptors, stimulating contraction of masticatory muscles Jaw rebounds into closed position Therefore it is a cyclic inhibition and stimulation of masticatory muscles |
