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Speech Pathology 1-2

MUSCLES OF MASTICATION

QuestionAnswer
What are the Mandibular Elevator muscles? 1)Temporalis 2)Masseter 3)Medial (internal) pterygoid
What are the Mandibular Depressors? MeG's lap: 1)Mylohyoid 2)Geniohyoid 3)Lateral (external) pterygoid 4)Anterior Belly of Digastric5)Posterior belly of digastric
O:lower border of mandible I:lesser horn of hyoid Anterior Belly of Digastric
C:inferior and posterior F:depresses mandible Anterior Belly of Digastric
O:mastoid process of temporal bone I:meets anterior belly at intermediate tendon Posterior belly of digastric
C:inferior and anteriorF:depresses mandible Posterior belly of digastric
Muscular floor of mouth Mylohyoid
O:inner surface on mandible near mental symphysis to last molarI:meets fibers from other side; posterior fibers insert directly into hyoid I:meets fibers from other side; posterior fibers insert directly into hyoid Mylohyoid
C:inferior and mediallyF:minimal help in lowering jaw Mylohyoid
O:lower part of mental symphysis I:body of hyoid Geniohyoid
C:posterior and inferior F:depresses mandible Geniohyoid
O:greater wing of sphenoid and lateral pterygoid plateI:condyle of mandible Lateral (external) pterygoid
C:horizontally and posteriorly F:protrudes mandible by sliding condyle down and forward Lateral (external) pterygoid
used to produce /a/ & stops Lateral (external) pterygoid
very powerful muscle that elevates the mandible Masseter
O:zygomatic arch I:angle, ramus and coronoid process Masseter
C:inferior and posterior F:elevates jaw Masseter
O:entire temporal bone I:anterior border of ramus and along coronoid process Temporalis
C:fibers converge as they travel inferiorly under the zygomatic arch F:elevates and retracts mandible Temporalis
O:between lateral and medial pterygoid plates of the sphenoid I:medial surface of ramus and angle of mandible Medial (internal) pterygoid
C:inferior, posterior and laterally F:forms a sling with masseter to elevate mandible Medial (internal) pterygoid
Created by: aramos139
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