muscles of the mandible

muscles of the mandible - inner fibers are important for...

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Temporomandibular Joint (TMJ): Enclosed by a fibrous capsule and lubricated by synovial fluid - 3 ligaments influence the movement of the TMJ 1. TMJ ligament: Between zygomatic arch and outer/back surface of condyle neck, Limits degree of down and back mandibular displacement 2. Sphenomandibular ligament: Between sphenoid and inner surface of ramus. Limits degree of down and back mandibular displacement 3. Stylomandibular ligament: Between styloid process and angle of mandible. Limits downward and forward mandibular displacement
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- TMJ Movements : Mandibular movements are described relative to the skull Upward and downward: Vertical Forward and backward: Retraction, Protrusion Side to side: Lateral
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Jaw Elevators/Retractors 1. Masseter from zygomatic arch to angle and ramus of mandible covers outer surface of mandible very powerful muscle outer fibers form bulk of muscle responsible for elevation of mandible
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Unformatted text preview: inner fibers are important for elevation and jaw retraction 2. Medial (internal) pterygoid from medial surface of lateral pterygoid plate to angle of ramus elevates mandible forms sling around angle with masseter 3. Temporalis from inferior temporal line of parietal bone to anterior border of ramus and along coronoid process of mandible results in upward and backward Jaw Depressors/Protruders 1. Lateral (external) pterygoid from greater wing of sphenoid and lateral pterygoid plate to neck of condyle (pterygoid fossa) contraction produces grinding and protrusion (down and forward) 2. Mylohyoid forms floor of mouth from lower edge of mandible to hyoid can lower mandible* 3. Geniohyoid from center of jaw (above mylohyoid) to hyoid can lower mandible* 4. Anterior belly of the digastric from center of jaw laterally to hyoid lowers mandible*...
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muscles of the mandible - inner fibers are important for...

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