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05/23/05 Review 1
Muscles of Mastication
A. Jaw closing muscles1. Masseter
2. Temporalis
3. Medial pterygoid
B. Jaw opening muscles1. Lateral pterygoid
a) Inferior head
b) Superior head
2. Anterior digastric
05/23/05 Review 2
Origin: zygomatic process
of the maxilla and inferiorborder of zygomatic arch
Insertion:angle of the mandible
inferior, lateral side of ramus
Innervation:masseteric nerve
Function:elevate mandible
Masseter
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Origin:temporal fossa and
temporal fascia
Insertion:coronoid process of
the mandible
Innervation:temporal nerve
Function:elevate mandible
Temporalis
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Origin:pterygoid fossa
on medial surface of lateral pterygoid plate
Insertion:medial surface of
angle of the mandible
Innervation:medial pterygoid
nerve
Function:elevate mandible
Medial Pterygoid
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Sphenoid
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Origin ofMedialPterygoid
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Origin:lateral surface of
lateral pterygoid plate
Insertion:anterior neck of mandible
Innervation:branch of masseteric or buccal nerve
Function:pull condyle and diskalong the eminence
Lateral Pterygoid -- Inferior Head
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Origin ofLateralPterygoid,Inferior head
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Origin:infratemporal fossa of greater sphenoid wing
Insertion:anterior neck of themandible
Innervation:branch of masseteric or buccal nerve
Function:pull condyle and diskalong the eminence
Lateral Pterygoid -- Superior Head
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SuperiorHead ofLateralPterygoid
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Origin:posterior digastric mastoid notch of temporal bone
Insertion:anterior digastric lingual, inferior border of the mandible
Innervation:Posterior digastric--facial nerveAnterior digastric--mylohyoid, mandibular nerve
Function:Lower mandible, raise hyoid
Digastric
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ANTERIOR DIGASTRIC
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Thank youand
Best of Luck!
