Muscles of Mastication

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Muscles of Mastication

• Jaw closing muscles
• Masseter
• Temporalis
• Medial pterygoid
• Jaw opening muscles
• Lateral pterygoid
• Inferior head
• Superior head
• Anterior digastric

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Masseter
Origin zygomatic process of the maxilla and
inferiorborder of zygomatic arch Insertion ang
le of the mandibleinferior, lateral side of
ramus Innervation masseteric
nerve Function elevate mandible
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Temporalis
Origin temporal fossa andtemporal
fascia Insertion coronoid process ofthe
mandible Innervation temporal
nerve Function elevate mandible
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Medial Pterygoid
Origin pterygoid fossa on medial surface of
lateral pterygoid plate Insertion medial
surface of angle of the mandible Innervation m
edial pterygoid nerve Function elevate mandible

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Sphenoid
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Origin of Medial Pterygoid
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Lateral Pterygoid -- Inferior Head
Origin lateral surface of lateral pterygoid
plate Insertion anterior neck of
mandible Innervation branch of masseteric or
buccal nerve Function pull condyle and
disk along the eminence
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Origin of Lateral Pterygoid, Inferior head
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Lateral Pterygoid -- Superior Head
Origin infratemporal fossa of greater sphenoid
wing Insertion anterior neck of
themandible Innervation branch of masseteric
or buccal nerve Function pull condyle and
disk along the eminence
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Superior Head of Lateral Pterygoid
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Digastric
Origin posterior digastric mastoid notch of
temporal bone Insertion anterior digastric
lingual, inferior border of the
mandible Innervation Posterior
digastric--facial nerve Anterior
digastric--mylohyoid, mandibular
nerve Function Lower mandible, raise hyoid
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ANTERIOR DIGASTRIC
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