10 Questions
Name the muscle of mastication that is attached to the temporal fossa.
Temporalis
What is the action of the temporalis muscle?
Elevates and draws the mandible posteriorly, retraction and side-to-side movement of the lower jaw, helps in closing the mouth
Which muscle protracts and elevates the mandible anteriorly?
Masseter
What is the function of the lateral pterygoid muscle?
Depresses the mandible and opens the mouth, pushes the mandible anteriorly, helps in closing the jaw
What is the origin of the medial pterygoid muscle?
Lateral pterygoid plate and greater wing of the sphenoid bone
Which muscle is responsible for the side-to-side movement of the lower jaw?
Temporalis
What is the insertion point of the masseter muscle?
Coronoid process and mandibular ramus
Which muscle helps in closing the mouth?
Temporalis
What is the origin of the lateral pterygoid muscle?
Lateral pterygoid plate and greater wing of the sphenoid bone
Which muscle pushes the mandible anteriorly and helps in closing the jaw?
Lateral Pterygoid
Study Notes
Muscles of Mastication
- Temporalis muscle originates from the temporal fossa.
- Temporalis muscle inserts into the coronoid process and mandibular ramus.
- Temporalis muscle elevates and draws the mandible posteriorly, and is also responsible for retraction and side-to-side movement of the lower jaw.
- Temporalis muscle helps in closing the mouth.
Masseter Muscle
- Masseter muscle originates from the zygomatic arch (cheekbone).
- Masseter muscle inserts into the lateral side of mandibular ramus.
- Masseter muscle protracts and elevates the mandible anteriorly, causing the teeth to conjoint while chewing.
- Masseter muscle is responsible for the closing of the jaw.
Pterygoids
Lateral Pterygoid
- Lateral Pterygoid muscle originates from the lateral pterygoid plate and greater wing of the sphenoid bone.
- Lateral Pterygoid muscle inserts into the condylar process of mandible and articular disk.
- Lateral Pterygoid muscle is located in the infratemporal fossa.
- Lateral Pterygoid muscle depresses the mandible and opens the mouth.
- Lateral Pterygoid muscle pushes the mandible anteriorly and helps in closing the jaw.
Medial Pterygoid
- Medial Pterygoid muscle originates from the lateral pterygoid plate.
- (Note: The action of Medial Pterygoid muscle is not specified in the provided text)
Test your knowledge of the muscles of mastication with this informative quiz. Identify the origins, insertions, and actions of muscles such as the temporalis and masseter. Challenge yourself and become an expert in the anatomy of chewing muscles.
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