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Questions and Answers
What is the primary function of the muscles of facial expression?
What is the primary function of the muscles of facial expression?
What is the common nerve that innervates all facial muscles?
What is the common nerve that innervates all facial muscles?
Which of the following muscles has its origin from bone or fascia and inserts into the skin?
Which of the following muscles has its origin from bone or fascia and inserts into the skin?
Which of these functions is NOT typically associated with facial expression muscles?
Which of these functions is NOT typically associated with facial expression muscles?
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Which area does NOT contain any facial expression muscles?
Which area does NOT contain any facial expression muscles?
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What blood supply primarily serves the muscles of facial expression?
What blood supply primarily serves the muscles of facial expression?
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Which of the following is NOT a subgroup where facial muscles are situated?
Which of the following is NOT a subgroup where facial muscles are situated?
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What common activity tests the functionality of the facial expression muscles?
What common activity tests the functionality of the facial expression muscles?
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What is the primary action of the Orbicularis Oris muscle?
What is the primary action of the Orbicularis Oris muscle?
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Which artery supplies blood to the Zygomaticus Major muscle?
Which artery supplies blood to the Zygomaticus Major muscle?
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From which origin does the Levator Labii Superioris muscle arise?
From which origin does the Levator Labii Superioris muscle arise?
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What is the main nerve supply for the Depressor Labii Inferioris muscle?
What is the main nerve supply for the Depressor Labii Inferioris muscle?
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Which of the following muscles elevates the upper lip?
Which of the following muscles elevates the upper lip?
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What is the insertion point of the Zygomaticus Major muscle?
What is the insertion point of the Zygomaticus Major muscle?
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Which blood supply is common to the Levator Labii Superioris and Depressor Labii Inferioris muscles?
Which blood supply is common to the Levator Labii Superioris and Depressor Labii Inferioris muscles?
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What is the action of the Zygomaticus Minor muscle?
What is the action of the Zygomaticus Minor muscle?
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Which branch of the facial nerve supplies the Zygomaticus Major muscle?
Which branch of the facial nerve supplies the Zygomaticus Major muscle?
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Which muscle is responsible for depressing the lower lip?
Which muscle is responsible for depressing the lower lip?
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What is the action of the Compressor Naris muscle?
What is the action of the Compressor Naris muscle?
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Which muscle is responsible for pulling the ear slightly forward?
Which muscle is responsible for pulling the ear slightly forward?
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Which nerve supplies all three muscles acting on the external ear?
Which nerve supplies all three muscles acting on the external ear?
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What is the blood supply for the Anterior Auricular muscle?
What is the blood supply for the Anterior Auricular muscle?
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What condition is commonly associated with issues in facial muscle functionality?
What condition is commonly associated with issues in facial muscle functionality?
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Which muscle is responsible for elevating the corners of the mouth?
Which muscle is responsible for elevating the corners of the mouth?
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What is the primary nerve supply for the Buccinator muscle?
What is the primary nerve supply for the Buccinator muscle?
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What action does the Mentalis muscle perform?
What action does the Mentalis muscle perform?
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Which artery primarily supplies blood to the Risorius muscle?
Which artery primarily supplies blood to the Risorius muscle?
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What is the action of the Platysma muscle?
What is the action of the Platysma muscle?
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Which muscle assists in mastication while working in opposition with the tongue?
Which muscle assists in mastication while working in opposition with the tongue?
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What is the function of the Orbicularis Oris muscle?
What is the function of the Orbicularis Oris muscle?
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From which origin does the Depressor Anguli Oris muscle arise?
From which origin does the Depressor Anguli Oris muscle arise?
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Which branch of the facial nerve innervates the frontalis part of the occipitofrontalis muscle?
Which branch of the facial nerve innervates the frontalis part of the occipitofrontalis muscle?
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Which muscle is also associated with facial expression and pulls the scalp up and back?
Which muscle is also associated with facial expression and pulls the scalp up and back?
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What shape does the orbital muscle have?
What shape does the orbital muscle have?
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Which artery is primarily responsible for the blood supply of the corrugator muscle?
Which artery is primarily responsible for the blood supply of the corrugator muscle?
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What is the action of the palpebrae muscle?
What is the action of the palpebrae muscle?
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Where does the procerus muscle insert?
Where does the procerus muscle insert?
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Which facial nerve branch supplies the corrugator muscle?
Which facial nerve branch supplies the corrugator muscle?
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What is the main action of the nasalis muscle?
What is the main action of the nasalis muscle?
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What is the origin point of the dilator naris?
What is the origin point of the dilator naris?
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Which action is performed by the corrugator muscle?
Which action is performed by the corrugator muscle?
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Which artery supplies blood to the procerus muscle?
Which artery supplies blood to the procerus muscle?
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What is the main function of the compressor naris?
What is the main function of the compressor naris?
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Study Notes
Muscles of Facial Expression
- Origin: Most facial muscles originate from bone or fascia and insert into the skin.
- Innervation: They're all innervated by the facial nerve.
- Blood Supply: The facial artery provides blood supply.
- Function: Facial muscles are responsible for expressions and are also important for speech and chewing (mastication).
Facial Muscle Subgroups
- Muscles of facial expression can be divided into subgroups based on location:
- Mouth
- Scalp
- Neck
- Eyes
- Nose
- Ears
Mouth Muscles
-
Orbicularis Oris:
- Origin: Anterior nasal spine and midline above the chin.
- Insertion: Interlacing fibers with muscles around the lips.
- Action: Closes and opens the mouth, compresses lips, protrudes lips.
- Nerve Supply: Facial nerve, buccal branch.
- Blood Supply: Facial, maxillary, and superficial temporal arteries.
-
Levator Labii Superioris:
- Origin: Lower rim of orbit.
- Insertion: Orbicularis Oris fibers at the upper lip.
- Action: Elevates the upper lip.
- Nerve Supply: Facial nerve, zygomatic, and buccal branches.
- Blood Supply: Facial and maxillary arteries.
-
Depressor Labii Inferioris:
- Origin: Below the oblique line of the mandible.
- Insertion: Orbicularis Oris in the lower lip.
- Action: Depresses the lower lip
- Nerve Supply: Facial nerve, mandibular branch.
- Blood Supply: Facial and maxillary arteries.
-
Zygomaticus Minor:
- Origin: Zygomatic arch.
- Insertion: Orbicularis Oris.
- Action: Elevates the upper lip.
- Nerve Supply: Facial nerve, buccal, and zygomatic branches.
- Blood Supply: Facial artery.
-
Zygomaticus Major:
- Origin: Zygomatic arch.
- Insertion: Blends with Orbicularis Oris at the angle of the mouth.
- Action: Elevates the corners of the mouth (e.g., during laughter).
- Nerve Supply: Facial nerve, buccal, and zygomatic branches.
- Blood Supply: Facial artery.
-
Levator Anguli Oris:
- Origin: Canine fossa of the maxilla, below the infra-orbital foramen.
- Insertion: Orbicularis Oris at the corner of the mouth.
- Action: Elevates the corner of the mouth.
- Nerve Supply: Facial nerve, buccal, and zygomatic branch.
- Blood Supply: Facial and maxillary arteries.
-
Depressor Anguli Oris:
- Origin: Beneath the angle of the mandible.
- Insertion: Converges into the angles of the mouth and blends with Orbicularis Oris.
- Action: Depresses the corner of the mouth.
- Nerve Supply: Facial nerve, buccal, and mandibular branches.
- Blood Supply: Facial and maxillary arteries.
-
Mentalis:
- Origin: Anterior surface of mandible (incisive fossa).
- Insertion: Skin covering the chin.
- Action: Puckers/pulls up the skin of the chin, helps Orbicularis Oris clear food from the labial sulcus.
- Nerve Supply: Facial nerve, mandibular branch.
- Blood Supply: Facial and maxillary arteries.
-
Buccinator:
- Origin: Pterygomandibular raphae and buccal alveolar bone (in maxillary and mandibular molar regions).
- Insertion: Blends with the Orbicularis Oris at the corners of the mouth.
- Action: Pulls corner of the mouth back, compresses cheek against buccal surfaces of molars, aids in mastication.
- Nerve Supply: Facial nerve, buccal branch.
- Blood Supply: Facial and maxillary arteries.
-
Risorius:
- Origin: Angle of the mandible.
- Insertion: Corner of the mouth.
- Action: Retracts the angle of the mouth, assists in smiling.
- Nerve Supply: Facial nerve, buccal branch.
- Blood Supply: Facial artery.
Scalp Muscles
-
Occipitofrontalis:
- Composed of three parts: frontalis, occipitalis, and galea aponeurotica.
- The frontalis is involved in facial expression.
- Origin: Connective tissue of the scalp.
- Insertion: Skin of the frontal regions of the eyebrows.
- Action: Pulls scalp up and back, elevates eyebrows, wrinkles scalp.
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Superficial temporal and ophthalmic arteries
Neck Muscles
-
Platysma:
- Origin: Clavicle and shoulder.
- Insertion: Lower border of mandible, skin, and muscle of the lower face and mouth.
- Action: Pulls down corners of the mouth (grimace), wrinkles skin of chin and neck.
- Nerve Supply: Facial nerve, cervical branch.
- Blood Supply: Facial artery and thyrocervical trunk.
Eye Muscles
-
Orbicularis Oculi:
- Has two parts: orbital and palpebrae.
- Orbital:
- Origin: Bone of the upper medial orbital margin.
- Action: Closes the eye forcefully.
- Palpebrae:
- Origin: Medial palpebral ligament.
- Action: Closes eyes gently (blinking).
- Orbital:
- Nerve Supply: Facial nerve, zygomatic, and temporal branches.
- Blood Supply: Superficial temporal, facial, and maxillary arteries.
- Has two parts: orbital and palpebrae.
-
Corrugator:
- Origin: Bridge of the nose.
- Insertion: Skin of the lateral part of the eyebrow.
- Action: Pulls eyebrows medially (frown).
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Superficial temporal artery.
-
Procerus:
- Origin: Bridge of the nose.
- Insertion: Medial end of the eyebrows.
- Action: Pulls eyebrows down (frown), wrinkles the nose.
- Nerve Supply: Facial nerve, zygomatic branch.
- Blood Supply: Facial artery
Nose Muscles
-
Nasalis:
- Composed of two parts: Dilator Naris and Compressor Naris
- Nerve Supply: Facial nerve, buccal branches
- Blood Supply: Facial artery
-
Dilator Naris:
- Origin: The nasal margin of the maxilla.
- Insertion: Skin of the nostril.
- Action: Flares the nostrils.
-
Compressor Naris:
- Origin: The top of the maxillary canine ridge.
- Insertion: Midline over the nasal cartilage.
- Action: Closes the nostrils.
Ear Muscles
-
Anterior Auricular:
- Origin: Scalp and temporal fascia.
- Insertion: Anterior medial aspect of the helix of the ear
- Action: Pulls the ear slightly forward.
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Posterior auricular artery.
-
Superior Auricular:
- Origin: Scalp and temporal fascia.
- Insertion: Superior medial aspect of the ear.
- Action: Raises the ear.
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Posterior auricular artery.
-
Posterior Auricular:
- Origin: Superior lateral aspect of the mastoid process.
- Insertion: Inferior medial aspect of the auricle of the ear.
- Action: Pulls the ear back.
- Nerve Supply: Facial nerve, temporal branch
- Blood Supply: Posterior auricular artery.
Conditions Affecting Facial Muscles
- Conditions impacting facial muscle function include Bell's Palsy, stroke, and surgery.
- These conditions can affect facial expressions and the delivery of dental treatment.
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Description
Test your knowledge on the muscles of facial expression, their origins, innervations, and functions. This quiz will cover various subgroups of these muscles, including those around the mouth, eyes, and scalp. Perfect for students studying anatomy or anyone looking to refresh their knowledge.
