4713185
Description
Flashcards by Krisha-Tyra B Ba, updated more than 1 year ago
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Created by Krisha-Tyra B Ba
about 8 years ago
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| Question | Answer |
| What is the action of the temporalis? | Principle elevator of the mandible All fibers: elevate mandible Anterior: elevate mandible Middle: Elevate and slightly retrude Posterior: retrusion, positioning |
| What is the primary muscle for chewing? | Masseter |
| What are the actions of the superficial and deep fibers of the masseter? | Superficial: Protrusion Deep: Stabilizes condyle when biting on incisors |
| What muscles are highly active in opening/closing and excursive movements? | Lateral pterygoid |
| What is the only muscle to insert into the TMJ capsule? | Lateral pterygoid |
| What muscle is the most important indicator of occlusal harmony? | Lateral pterygoid |
| What are the actions of the superior head of the lateral pterygoid? | Superior: inactive during opening, active during closing; easily injured |
| What are the actions of the inferior head of the lateral pterygoid? | Inferior: active in protusion, active side of the muscle is nonworking (Move to right: left lateral pterygoid is the one that is working/contracting/pulling) |
| True or False: The medial pterygoid is the primary depressor of the mandible. | FALSE The medial pterygoid is the primary ELEVATOR of the mandible. |
| The medial pterygoid is highly active during which excursive movement? | Protrusive |
| What are the four suprahyoid muscles and what are their actions? | Geniohyoid Stylohyoid Mylohyoid Digastric Elevate hyoid and tongue |
| What are the 4 infrahyoid muscles? | Sternohyoid Thyrohyoid Sterothyroid Omohyoid |
| True or False: The suprahyoid muscles are relaxed during unrestricted normal opening | TRUE |
| What muscles aid in elevation during unrestricted normal closing? | Medial pterygoid Anterior temporalis Masseter |
| What muscles aid in position during unrestricted normal opening? | Middle and posterior fibers of temporalis |
| True or False: The deep masseter and posterior temporalis are active during mandibular retrusion. | TRUE |
| What supra- and/or infrahyoid muscles are active retractors in retrusion? | Genohyoid Digastric |
| What muscle will stabilize movement during retrusion? | Superior lateral pterygoid |
| True or False: The masseter is the only muscle active during the intiation of foward movement in mandibular closure. | FALSE Medial pterygoid + Masseter |
| The precise closure of the mandible is aids by what muscle(s)? | Posterior fibers of the temporalis Superior lateral pterygoid |
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