Podcast
Questions and Answers
Which of the following muscles is NOT involved in facial expression?
Which of the following muscles is NOT involved in facial expression?
- Zygomaticus major
- Orbicularis oculi
- Frontalis
- Sternocleidomastoid (correct)
What is the primary nerve that innervates the muscles of facial expression?
What is the primary nerve that innervates the muscles of facial expression?
- Vagus nerve
- Hypoglossal nerve
- Facial nerve (correct)
- Trigeminal nerve
Which branch of the facial nerve is NOT one of its five main branches?
Which branch of the facial nerve is NOT one of its five main branches?
- Buccal
- Zygomatic
- Cervical
- Maxillary (correct)
Which muscle is primarily responsible for closing the eyelids?
Which muscle is primarily responsible for closing the eyelids?
The facial artery primarily supplies blood to which of the following?
The facial artery primarily supplies blood to which of the following?
What role do facial muscles play in speech?
What role do facial muscles play in speech?
Which structure do most facial muscles originate from?
Which structure do most facial muscles originate from?
Which of the following is an emotion that facial muscles help to express?
Which of the following is an emotion that facial muscles help to express?
In which subgroup of facial muscles would you find the orbicularis oris?
In which subgroup of facial muscles would you find the orbicularis oris?
What is the primary action of the Compressor Naris muscle?
What is the primary action of the Compressor Naris muscle?
Which muscle pulls the ear slightly forward?
Which muscle pulls the ear slightly forward?
Which artery supplies blood to the muscles acting on the external ear?
Which artery supplies blood to the muscles acting on the external ear?
What is the nerve supply for both the Anterior Auricular and Superior Auricular muscles?
What is the nerve supply for both the Anterior Auricular and Superior Auricular muscles?
What common condition may affect the functionality of facial muscles?
What common condition may affect the functionality of facial muscles?
What is the main function of the Superior Auricular muscle?
What is the main function of the Superior Auricular muscle?
What is the primary action of the Orbital muscle?
What is the primary action of the Orbital muscle?
Which artery supplies blood to the Corrugator muscle?
Which artery supplies blood to the Corrugator muscle?
What is the primary action of the Orbicularis Oris muscle?
What is the primary action of the Orbicularis Oris muscle?
Where does the Procerus muscle insert?
Where does the Procerus muscle insert?
Which nerve branch supplies the Levator Labii Superioris muscle?
Which nerve branch supplies the Levator Labii Superioris muscle?
What is the origin of the Dilator Naris muscle?
What is the origin of the Dilator Naris muscle?
Which nerve supplies the Nasalis muscle?
Which nerve supplies the Nasalis muscle?
What is the origin of the Depressor Labii Inferioris muscle?
What is the origin of the Depressor Labii Inferioris muscle?
Which muscle is primarily responsible for elevating the corners of the mouth?
Which muscle is primarily responsible for elevating the corners of the mouth?
Which muscle is responsible for frowning by pulling the eyebrows medially?
Which muscle is responsible for frowning by pulling the eyebrows medially?
Where does the Zygomaticus Major muscle insert?
Where does the Zygomaticus Major muscle insert?
What is the action of the Compressor Naris muscle?
What is the action of the Compressor Naris muscle?
What is the nerve supply for the Orbital muscle?
What is the nerve supply for the Orbital muscle?
Which arteries supply blood to the Levator Labii Superioris muscle?
Which arteries supply blood to the Levator Labii Superioris muscle?
Which muscle action is associated with the Nasalis?
Which muscle action is associated with the Nasalis?
What is the action of the Depressor Labii Inferioris muscle?
What is the action of the Depressor Labii Inferioris muscle?
Which facial muscle is innervated by both buccal and zygomatic branches of the facial nerve?
Which facial muscle is innervated by both buccal and zygomatic branches of the facial nerve?
Which artery supplies blood to the Procerus muscle?
Which artery supplies blood to the Procerus muscle?
What characteristic action is attributed to the Orbicularis Oris muscle?
What characteristic action is attributed to the Orbicularis Oris muscle?
What is the origin of the Zygomaticus Major muscle?
What is the origin of the Zygomaticus Major muscle?
What is the primary action of the Levator Anguli Oris muscle?
What is the primary action of the Levator Anguli Oris muscle?
Which nerve supplies the Buccinator muscle?
Which nerve supplies the Buccinator muscle?
What is the blood supply for the Depressor Anguli Oris muscle?
What is the blood supply for the Depressor Anguli Oris muscle?
Where does the Mentalis muscle insert?
Where does the Mentalis muscle insert?
What is the action of the Orbicularis Oculi muscle?
What is the action of the Orbicularis Oculi muscle?
From which location does the Platysma originate?
From which location does the Platysma originate?
What is the primary action of the Risorius muscle?
What is the primary action of the Risorius muscle?
Which artery supplies the Occipitofrontalis muscle?
Which artery supplies the Occipitofrontalis muscle?
The Buccinator muscle is involved in which function?
The Buccinator muscle is involved in which function?
What blends with the Orbicularis Oris at the corners of the mouth?
What blends with the Orbicularis Oris at the corners of the mouth?
Flashcards
Orbicularis Oris
Orbicularis Oris
Muscle circling the mouth; controls lip action
Levator Labii Superioris
Levator Labii Superioris
Raises the upper lip
Depressor Labii Inferioris
Depressor Labii Inferioris
Lowers the lower lip
Zygomaticus Minor
Zygomaticus Minor
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Zygomaticus Major
Zygomaticus Major
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Levator Anguli Oris
Levator Anguli Oris
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Depressor Anguli Oris
Depressor Anguli Oris
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Mentalis
Mentalis
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Buccinator
Buccinator
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Risorius
Risorius
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Occipitofrontalis (frontalis)
Occipitofrontalis (frontalis)
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Platysma
Platysma
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Orbicularis Oculi (Orbital)
Orbicularis Oculi (Orbital)
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Orbicularis Oculi (Palpebrae)
Orbicularis Oculi (Palpebrae)
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Corrugator
Corrugator
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Procerus
Procerus
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Nasalis (Dilator)
Nasalis (Dilator)
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Nasalis (Compressor)
Nasalis (Compressor)
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Anterior Auricular
Anterior Auricular
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Superior Auricular
Superior Auricular
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Posterior Auricular
Posterior Auricular
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Study Notes
Muscles of Facial Expression
- Most facial muscles originate from bone or fascia and insert into the skin.
- Facial muscles are innervated by the facial nerve and supplied by the facial artery.
- Facial muscles are responsible for expressions and have multiple functions, including speech, mastication, and facial aesthetics.
Mouth
Orbicularis Oris
- Circles the oral cavity in lip tissue.
- Origin: Some bony attachment (anterior nasal spine and midline above the chin).
- Insertion: Fibres interlace with muscles around the lips.
- Action: Closes and opens the mouth, compresses the lips, and protrudes the lips.
- Nerve Supply: Facial nerve, buccal branch.
- Blood Supply: Facial, maxillary & superficial temporal arteries.
Levator Labii Superioris
- Origin: Lower rim of orbit.
- Insertion: Fibres of Orbicularis Oris at the upper lip.
- Action: Elevates upper lip.
- Nerve Supply: Facial nerve, zygomatic and buccal branches.
- Blood Supply: Facial & maxillary arteries.
Depressor Labii Inferioris
- Origin:Beneath the lowest portion of the oblique line of the mandible.
- Insertion: Orbicularis Oris in the lower lip.
- Action: Depresses lower lip.
- Nerve Supply: Facial nerve, mandibular branch.
- Blood Supply: Facial & maxillary arteries.
Zygomaticus Minor
- Origin: Zygomatic arch.
- Insertion: Orbicularis Oris.
- Action: Elevates upper lip.
- Nerve Supply: Facial nerve, buccal & zygomatic branches.
- Blood Supply: Facial artery
Zygomaticus Major
- Origin: Zygomatic arch.
- Insertion: Travels downwards and medially to blend with Orbicularis Oris at the angle of the mouth.
- Action: Elevates corners of the mouth (e.g. during laughter).
- Nerve Supply: Facial nerve, buccal & zygomatic branches.
- Blood Supply: Facial artery.
Levator Anguli Oris
- Origin: Canine fossa of the Maxilla, below the infra-orbital foramen.
- Insertion: The Orbicularis Oris at the corner of the mouth.
- Action: Elevates the corner of the mouth.
- Nerve Supply: Facial nerve, buccal & zygomatic branch.
- Blood Supply: Facial & maxillary arteries.
Depressor Anguli Oris
- Origin: Beneath the angle of the mandible.
- Insertion: Converges into the angles of the mouth and blend with Orbicularis Oris.
- Action: Depresses corner of the mouth.
- Nerve Supply: Facial nerve, buccal & mandibular branches.
- Blood Supply: Facial & maxillary arteries.
Mentalis
- Origin: Anterior surface of the mandible (incisive fossa).
- Insertion: Skin covering the chin.
- Action: Puckers/pulls skin of the chin upwards, helps the Orbicularis Oris muscle in clearing food from the labial sulcus
- Nerve Supply: Facial nerve, mandibular branch.
- Blood Supply: Facial & maxillary arteries.
Buccinator
- Origin: Pterygomandibular raphae and buccal alveolar bone (in maxillary and mandibular molars regions).
- Insertion: Blend with the Orbicularis Oris at the corners of the mouth.
- Action: Pulls the corner of the mouth back and compresses the cheek against the buccal surfaces of molars. Aids in mastication by working in opposition to the tongue to direct food to the occlusal tooth surfaces.
- Nerve Supply: Facial nerve, buccal branch.
- Blood Supply: Facial & 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
Occipitofrontalis
- Consists of 3 parts: frontalis, occipitalis, and galea aponeurotica.
- The one associated with facial expression is the frontalis.
- Origin: Connective tissue of the scalp.
- Insertion: Skin of the frontal regions of the eyebrows.
- Action: Pulls the scalp up and back – elevates eyebrows and wrinkles scalp.
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Superficial temporal & opthalmic arteries.
Neck
Platysma
- Origin: Clavicle & shoulder.
- Insertion: Lower border of mandible, skin & muscle of lower face & mouth.
- Action: Pulls down the corners of the mouth (grimace), and wrinkles skin of the chin & neck.
- Nerve Supply: Facial nerve, cervical branch.
- Blood Supply: Facial artery & thyrocervical trunk.
Eyes
Orbicularis Oculi
- Made up of 2 parts: orbital and palpebrae.
- Orbital:
- Horseshoe shape encircling the eye.
- Origin: bone of the upper medial orbital margin.
- Action: Closes the eye forcefully.
- Palpebrae:
- Origin: medial palpebral ligament and arches laterally within the eyelid.
- Action: Closes eyes gently (blinking).
- Nerve Supply: Facial nerve, zygomatic & temporal branches.
- Blood Supply: Superficial temporal, facial & maxillary arteries.
Corrugator
- Origin: Bridge of the nose.
- Insertion: Skin of the lateral part of 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), and wrinkling of the nose.
- Nerve Supply: Facial nerve, zygomatic branch.
- Blood Supply: Facial artery.
Nose
Nasalis
- Made up of 2 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.
Ears
- There are 3 muscles that act on the external ear: Anterior Auricular, Superior Auricular, and Posterior Auricular.
Anterior Auricular
- Origin: The 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 the ear.
- Action: Pulls the ear back.
- Nerve Supply: Facial nerve, temporal branch.
- Blood Supply: Posterior auricular artery.
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Description
Test your knowledge on the muscles of facial expression, including their origins, insertions, actions, and nerve supplies. This quiz covers key muscles like Orbicularis Oris and Levator Labii Superioris, which play crucial roles in facial movements and aesthetics.
