Podcast
Questions and Answers
Which muscle of mastication is responsible for protraction and elevation of the mandible?
Which muscle of mastication is responsible for protraction and elevation of the mandible?
Which nerve supplies all the muscles of mastication?
Which nerve supplies all the muscles of mastication?
From where does the temporalis muscle take its origin?
From where does the temporalis muscle take its origin?
What is the action of the lateral pterygoid muscle?
What is the action of the lateral pterygoid muscle?
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Which muscle is responsible for depressing the mandible to open the mouth?
Which muscle is responsible for depressing the mandible to open the mouth?
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What is the insertion point of the medial pterygoid muscle?
What is the insertion point of the medial pterygoid muscle?
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Which muscle of mastication retracts the mandible?
Which muscle of mastication retracts the mandible?
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Where does the masseter muscle take its origin from?
Where does the masseter muscle take its origin from?
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What nerve supplies the lateral pterygoid muscle?
What nerve supplies the lateral pterygoid muscle?
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Which muscle of mastication is responsible for moving the mandible side to side during chewing?
Which muscle of mastication is responsible for moving the mandible side to side during chewing?
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From where does the temporalis muscle arise?
From where does the temporalis muscle arise?
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What is the action of the masseter muscle?
What is the action of the masseter muscle?
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Study Notes
Skull Views
- Norma frontalis: anterior view of the skull
- Norma verticalis: superior view of the skull
- Norma occipitalis: posterior view of the skull
- Norma basalis: inferior view of the skull
Mandible and Fossae
- Temporal fossa: location of the temporalis muscle
- Infratemporal fossa: location of the lateral and medial pterygoid muscles
Muscles of Mastication
- 4 muscles: temporalis, masseter, lateral pterygoid, and medial pterygoid
- All muscles originate from the skull and insert into the mandible
- All muscles receive nerve supply from the mandibular nerve
Temporalis Muscle
- Origin: floor of temporal fossa and deep surface of temporal fascia
- Insertion: coronoid process and anterior border of ramus mandible
- Nerve supply: anterior division of mandibular nerve
- Action: elevation of mandible by anterior fibers and retraction by posterior fibers
Masseter Muscle
- Origin: lower border and inner surface of the zygomatic arch
- Insertion: lateral surface of the ramus of the mandible
- Nerve supply: anterior division of the mandibular nerve
- Action: elevation and protraction of the mandible
Lateral Pterygoid Muscle
- Origin: upper head from infratemporal surface of the greater wing of sphenoid bone, lower head from lateral surface of the lateral pterygoid plate
- Action: depression of the mandible (opening the mouth), protraction of the mandible, and movement of the mandible side to side (chewing)
Important Notes
- All muscles of mastication elevate the mandible (close the mouth) except the lateral pterygoid
- All muscles of mastication protract the mandible except the temporalis
- Medial and lateral pterygoid muscles move the mandible side to side (chewing)
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Description
Test your knowledge on the anterior, superior, posterior, and inferior views of the skull, along with the muscles of mastication including Temporalis, Masseter, Lateral pterygoid, and Medial pterygoid. Learn about the origin, insertion, and nerve supply of these muscles.
