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Questions and Answers
What is the origin of the Obicularis Oris?
What is the origin of the Obicularis Oris?
What is the action of the Buccinator Muscle?
What is the action of the Buccinator Muscle?
Pulls each labial commissure laterally and shortens the cheek both vertically and horizontally.
What does the Corrugator Supercilli muscle do?
What does the Corrugator Supercilli muscle do?
Draws the skin of the eyebrow medially and inferiorly toward the nose, causing wrinkles.
Where does the Levator Anguli Oris Muscle insert?
Where does the Levator Anguli Oris Muscle insert?
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What is the main action of the Temporalis Muscle?
What is the main action of the Temporalis Muscle?
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What does the Medial Pterygoid Muscle do?
What does the Medial Pterygoid Muscle do?
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What is the action of the Lateral Pterygoid Muscle?
What is the action of the Lateral Pterygoid Muscle?
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What is one of the strongest muscles in the head and neck?
What is one of the strongest muscles in the head and neck?
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What is the main action of the Mentalis Muscle?
What is the main action of the Mentalis Muscle?
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What does the Platysma muscle assist with?
What does the Platysma muscle assist with?
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What is the origin of the trapezius muscle?
What is the origin of the trapezius muscle?
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What is the insertion of the Risorius Muscle?
What is the insertion of the Risorius Muscle?
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Study Notes
Obicularis Oris
- Origin: No bony attachment; directly inserts into the lips.
- Action: Controls mouth and lip movement, including closing, opening, pursuing lips, and kissing.
Buccinator Muscle
- Origin: Alveolar processes of the maxilla and mandible, and the pterygomandibular raphe.
- Insertion: Skin of the labial commissure.
- Action: Pulls labial commissures laterally and shortens the cheek vertically and horizontally.
Corrugator Supercilli
- Origin: Frontal bone in the supraorbital region.
- Insertion: Skin of the eyebrow.
- Action: Frowning (crows feet); draws eyebrow skin medially and inferiorly towards the nose, creating wrinkles.
Levator Anguli Oris Muscle
- Origin: Canine fossa.
- Insertion: Skin at the ipsilateral labial commissure.
- Action: Raises the corner of the mouth.
Temporalis Muscle
- Origin: Fossa on the temporal bone.
- Insertion: Coronoid process and ramus of the mandible.
- Action: Elevates the mandible, raising the lower jaw.
Medial Pterygoid Muscle
- Origin: Pterygoid plate of the sphenoid bone, palatine bone process, and maxillary tuberosity.
- Insertion: Medial surface of the ramus and angle of the mandible.
- Action: Elevates the mandible and parallels the masseter muscle, though it is weaker.
Lateral Pterygoid Muscle
- Origin: Superior head from the greater wing of the sphenoid bone; inferior head from the lateral pterygoid plate of sphenoid bone.
- Insertion: Pterygoid fovea of the mandible, TMJ disc, and capsule.
- Action: Depresses the mandible, facilitating jaw opening and moving the mandible forward.
Masseter Muscle
- Origin: Zygomatic arch from various areas.
- Insertion: External surface of the mandible.
- Action: Elevates the mandible during jaw closing; one of the strongest muscles involved in mastication.
Mentalis Muscle
- Action: Raises the chin and protrudes the lower lip.
Platysma
- Action: Assists in raising neck skin and grimacing.
Trapezius Muscle
- Origin: External surface of the occipital bone and posterior midline of the cervical and thoracic regions.
- Insertion: Lateral third of the clavicle and parts of the scapula.
- Action: Lifts the clavicle and scapula.
Risorius Muscle
- Insertion: Labial commissure; aids in smiling and grimacing.
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Description
This quiz provides an overview of key facial muscles, including their origins, insertions, and actions. Test your knowledge on the Obicularis Oris, Buccinator, Corrugator Supercilli, and other important muscles associated with facial expressions and movements.
