Questions and Answers
What is the primary function of the Medial Pterygoid muscle?
Which nerve branch is responsible for the sensation of pain in the face?
What is the action of the Lateral Pterygoid muscle on the mandible?
Which muscle is not primarily responsible for the movement of the mandible?
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What is the name of the nerve that supplies the muscles of mastication?
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Which nerve supplies the muscles of mastication?
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Which muscle of mastication depresses the mandible?
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Which of the following muscles of mastication does not protrude the mandible?
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What is the origin of the Temporalis muscle?
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Which branch of the trigeminal nerve is responsible for carrying sensory information from the maxillary region?
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Which muscle is responsible for elevation of the mandible?
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Which nerve supplies the Temporalis muscle?
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Which of the following muscles is NOT involved in protraction of the mandible?
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What is the insertion point of the Lateral Pterygoid muscle?
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Which of the following muscles is responsible for depression of the mandible?
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What is the origin point of the Medial Pterygoid muscle?
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Which nerve branch supplies the Masseter muscle?
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Which of the following muscles has a superficial and deep head?
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Study Notes
Muscles of Mastication
- There are 4 muscles of mastication:
- Temporalis
- Masseter
- Lateral Pterygoid
- Medial Pterygoid
Temporalis Muscle
- Origin:
- Deep head: from the floor of the temporal fossa
- Superficial head: from the temporal fascia
- Insertion:
- Medial surface of the coronoid process
- Anterior border
- Tip
- Nerve supply:
- Deep temporal nerves
- Action:
- Elevation of the mandible
- Retraction of the mandible
Masseter Muscle
- Origin:
- Lower border and inner surface of the zygomatic arch
- Insertion:
- Lateral surface of the ramus of the mandible
- Action:
- Elevation of the mandible
- Protraction of the mandible
- Nerve supply:
- Trigeminal nerve (mandibular nerve)
Lateral Pterygoid Muscle
- Origin:
- Upper head: from the infratemporal crest of the greater wing of the sphenoid
- Lower head: from the lateral surface of the lateral pterygoid plate
- Insertion:
- Fovea in front of the head of the mandible
- Action:
- Protraction of the mandible
- Depression of the mandible
- Side to side movement
- Nerve supply:
- Anterior division of the mandibular nerve
Medial Pterygoid Muscle
- Origin:
- Superficial head: from the maxillary tuberosity
- Deep head: from the medial surface of the lateral pterygoid plate
- Insertion:
- Medial surface of the mandible
- Action:
- Elevation of the mandible
- Side to side movement
- Nerve supply:
- Trigeminal nerve (mandibular nerve)
Trigeminal Nerve
- Also known as the fifth cranial nerve
- Emerges from the side of the pons
- Has a large sensory root and a small motor root
- Crosses the apex of the petrous temporal bone beneath the superior petrosal sinus
- Enters the middle cranial fossa
- Chief sensory nerve for the face and head
- Has sensations of pain, temperature, and touch
- Motor action on muscles of mastication
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Description
This quiz covers the anatomy and function of the mandible, including the muscles involved in its movement and the nerve supply of the trigeminal nerve.
