Questions and Answers
What are the two parts to the Masseter Muscle?
Superficial and deep
Which muscle group does the Masseter muscle belong to?
Muscle of Mastication
What is the origin of the Masseter muscle?
Zygomatic process of the maxilla and zygomatic arch
Where is the insertion point of the Masseter?
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What is the action of the Masseter muscle?
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What is the innervation of the Masseter muscle?
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Describe the Masseter muscle with respect to origin, insertion, action, and innervation.
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What group does the Temporalis muscle belong to?
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Name the three parts of the Temporalis muscle.
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What is the origin of the Temporalis muscle?
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Where does the Temporalis muscle insert?
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What is the action of the Temporalis muscle?
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What is the innervation of the Temporalis muscle?
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Describe the Temporalis muscle with respect to origin, insertion, action, and innervation.
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What two parts can the Pterygoid muscle be divided into?
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What muscle group does the medial Pterygoid muscle belong to?
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Where is the origin of the medial Pterygoid muscle?
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Where is the insertion point of the medial Pterygoid muscle?
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What is the action of the medial Pterygoid muscle?
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What nerves innervate the medial Pterygoid muscle?
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Describe the medial Pterygoid muscle with respect to origin, insertion, action, and innervation.
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What is the origin of the lateral Pterygoid muscle?
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Where is the insertion point of the lateral Pterygoid muscle?
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What is the action of the lateral Pterygoid muscle?
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What nerves innervate the lateral Pterygoid muscle?
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Study Notes
Masseter Muscle
- Composed of two parts: superficial and deep.
- Belongs to muscle group responsible for mastication.
- Originates from the zygomatic process of the maxilla and the zygomatic arch.
- Inserts on the external surface of the ramus and angle, as well as the coronoid process of the mandible.
- Functions to elevate the mandible; superficial part aids in protrusion, while the deep part assists in retraction.
- Innervated by a nerve from the mandibular division of the trigeminal nerve.
Temporalis Muscle
- Comprised of three parts: anterior, middle, and posterior.
- Part of the muscle group responsible for mastication.
- Originates from the temporal fossa.
- Inserts at the coronoid process and anterior surface of the ramus of the mandible.
- Actions include elevating and retracting the mandible.
- Innervated by the deep temporal nerve from the mandibular division of the trigeminal nerve.
Medial Pterygoid Muscle
- Divided into medial (internal) and lateral (external) parts.
- Another member of the muscle group for mastication.
- Originates from the lateral pterygoid plate and fossa of the sphenoid bone.
- Inserts at the internal surfaces of the angle and ramus of the mandible.
- Elevates the mandible, protrudes it with lateral pterygoid muscle, and can move the jaw laterally when contracted unilaterally.
- Innervated by the medial pterygoid nerve from the mandibular division of the trigeminal nerve.
Lateral Pterygoid Muscle
- Originates from the greater wing of the sphenoid and the external surface of the lateral pterygoid plate.
- Inserts at the articular disc of the temporomandibular joint and the pterygoid fovea located at the neck of the condylar process of the mandible.
- Functions to protrude the mandible through bilateral contraction and moves the mandible laterally during unilateral contraction, aiding in grinding.
- Co-activated with jaw-closing muscles during certain movements.
- Innervated by the anterior trunk of the mandibular division of the trigeminal nerve.
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Description
Test your knowledge on the Masseter muscle with these flashcards. Explore its anatomy, origin, insertion points, and classification. Perfect for students studying human anatomy or anyone interested in muscle functions.