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Mastication Musc.

Dental Anatomy DENT-110

Muscleorigin/insertionaction
Masseter-superficial head zygomatic process of maxilla and anterior of inferior border of zygomatic arch/lateral surface of the angle of the mandible bilateral contraction, elevation of the mandible during closing of jaws
masseter-deep head posterior third and medial surface of zygomatic arch/lateral surface of mandibular ramus Bilateral contraction, elevation of the mandible during closing of jaws
Temporalis inferior temporal line and infratemporal crest of sphenoid bone within fossa/coronoid process of mandibular ramus bilateral contraction of entire muscle-elevation of mandible. Bilateral contraction of only posterior part, retraction of mandible backward
Medial pterygoid Deep-betweenpterygoid plates, Superficial -lateral surface of pyramidal process of palatine bone and maxillary tuberosity/medial surface of mandibular ramus and angle of mandible bilateral contraction of deep and superficial-elevation of mandible
Lateral pterygoid Superior head-infratemporal surface and crest of spheniod,. Inferior head-lateral pterygoid plate of spheniod/both heads-anterior surface of neck of mandibular condyle, temporomandibular joint Unilateral contraction- shift mandible side to side. Bilateral contraction protrusion of mandible forward, slight depression of mandible during jaw opening
Created by: SonyaP
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