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Questions and Answers
Which muscle of mastication is responsible for depressing the mandible?
Which muscle of mastication is responsible for depressing the mandible?
- Temporalis
- Medial pterygoid
- Lateral pterygoid (correct)
- Masseter
What is the origin of the Temporalis muscle?
What is the origin of the Temporalis muscle?
- Infratemporal surface of the greater wing of the sphenoid bone
- Floor of the temporal fossa and deep surface of temporal fascia (correct)
- Lateral surface of the lateral pterygoid plate
- Lower border and inner surface of the zygomatic arch
Which view of the skull is also known as the anterior view?
Which view of the skull is also known as the anterior view?
- Norma verticalis
- Norma basalis
- Norma occipitalis
- Norma frontalis (correct)
What is the nerve supply of the muscles of mastication?
What is the nerve supply of the muscles of mastication?
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Which muscle of mastication elevates the mandible and also retracts it?
Which muscle of mastication elevates the mandible and also retracts it?
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What is the insertion of the Masseter muscle?
What is the insertion of the Masseter muscle?
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Which muscle of mastication is responsible for moving the mandible side to side?
Which muscle of mastication is responsible for moving the mandible side to side?
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What is the origin of the Lower head of the Lateral pterygoid muscle?
What is the origin of the Lower head of the Lateral pterygoid 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 Muscles of Mastication
- Mandible: Lower jawbone
- Temporal and Infratemporal Fossa: Bony cavities in the skull
Muscles of Mastication
- Temporalis • 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 • Origin: Lower border and inner surface of zygomatic arch • Insertion: Lateral surface of ramus of mandible • Nerve Supply: Anterior division of mandibular nerve • Action: Elevation and protraction of mandible
- Lateral Pterygoid • Origin: Upper head from infratemporal surface of greater wing of sphenoid bone, lower head from lateral surface of lateral pterygoid plate • Insertion: Anterior aspect of neck of mandible and articular disc of temporo-mandibular joint • Nerve Supply: Anterior division of mandibular nerve • Action: Depression of mandible (opening the mouth) and protraction of mandible
Important Notes
- All muscles of mastication take origin from the skull and are inserted in the mandible
- All muscles receive nerve supply from the mandibular nerve
- All muscles elevate the mandible (close the mouth) except lateral pterygoid, which depresses the mandible (open the mouth)
- All muscles protract the mandible except temporalis, which retracts the mandible
- Medial and Lateral Pterygoid muscles move the mandible side to side (chewing)
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