Podcast
Questions and Answers
Which branch of the facial nerve innervates the muscles responsible for elevating the upper lip?
Which branch of the facial nerve innervates the muscles responsible for elevating the upper lip?
What is the primary action of the Orbicularis Oris muscle?
What is the primary action of the Orbicularis Oris muscle?
Which muscle is responsible for depressing the lower lip?
Which muscle is responsible for depressing the lower lip?
Which artery supplies blood to the Zygomaticus major muscle?
Which artery supplies blood to the Zygomaticus major muscle?
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The Zygomaticus minor muscle originates from which anatomical structure?
The Zygomaticus minor muscle originates from which anatomical structure?
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The facial nerves are responsible for innovating which of the following muscle groups?
The facial nerves are responsible for innovating which of the following muscle groups?
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What action does the Zygomaticus major muscle perform?
What action does the Zygomaticus major muscle perform?
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Which of the following is NOT a function of the facial muscles?
Which of the following is NOT a function of the facial muscles?
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The blood supply to the Levator labii superioris is derived from which arteries?
The blood supply to the Levator labii superioris is derived from which arteries?
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Which branch of the facial nerve innervates the Depressor labii inferioris muscle?
Which branch of the facial nerve innervates the Depressor labii inferioris muscle?
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What is the primary action of the Levator anguli Oris muscle?
What is the primary action of the Levator anguli Oris muscle?
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Which blood vessels supply the Depressor anguli Oris muscle?
Which blood vessels supply the Depressor anguli Oris muscle?
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What is the insertion point for the Mentalis muscle?
What is the insertion point for the Mentalis muscle?
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Which nerve branch innervates the Buccinator muscle?
Which nerve branch innervates the Buccinator muscle?
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The main function of the Risorius muscle is to:
The main function of the Risorius muscle is to:
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Where does the Buccinator muscle originate?
Where does the Buccinator muscle originate?
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The action of the Mentalis muscle includes which of the following?
The action of the Mentalis muscle includes which of the following?
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Which type of branches innervate the Levator anguli Oris muscle?
Which type of branches innervate the Levator anguli Oris muscle?
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Which action does the Depressor anguli Oris perform?
Which action does the Depressor anguli Oris perform?
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What is the primary blood supply to the Risorius muscle?
What is the primary blood supply to the Risorius muscle?
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What is the primary action of the occipitofrontalis muscle?
What is the primary action of the occipitofrontalis muscle?
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Which nerve is responsible for the action of the platysma muscle?
Which nerve is responsible for the action of the platysma muscle?
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Which structure does the orbicularis oculi muscle originate from?
Which structure does the orbicularis oculi muscle originate from?
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How does the platysma affect facial expression?
How does the platysma affect facial expression?
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What is the primary action of the corrugator muscle?
What is the primary action of the corrugator muscle?
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Which artery supplies blood to the occipitofrontalis muscle?
Which artery supplies blood to the occipitofrontalis muscle?
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Which muscle is responsible for closing the nostrils?
Which muscle is responsible for closing the nostrils?
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What shape does the orbicularis oculi muscle take?
What shape does the orbicularis oculi muscle take?
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What nerve innervates the superior auricular muscle?
What nerve innervates the superior auricular muscle?
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What action does the orbicularis oculi perform?
What action does the orbicularis oculi perform?
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Where does the platysma muscle insert?
Where does the platysma muscle insert?
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What is the action of the procerus muscle?
What is the action of the procerus muscle?
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Which artery supplies the corrugator muscle?
Which artery supplies the corrugator muscle?
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Which of the following is NOT an action of the platysma muscle?
Which of the following is NOT an action of the platysma muscle?
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The primary blood supply for the orbicularis oculi muscle comes from which artery?
The primary blood supply for the orbicularis oculi muscle comes from which artery?
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What is the primary action of the dilator naris muscle?
What is the primary action of the dilator naris muscle?
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Where does the anterior auricular muscle originate?
Where does the anterior auricular muscle originate?
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What action is performed by the posterior auricular muscle?
What action is performed by the posterior auricular muscle?
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Which nerve is responsible for the innervation of the compressor naris muscle?
Which nerve is responsible for the innervation of the compressor naris muscle?
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What is the origin of the nasalis muscle?
What is the origin of the nasalis muscle?
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Study Notes
Muscles of Facial Expressions
- All muscles of facial expressions are innervated by the facial nerve and supplied by the facial artery.
- Lie in the subcutaneous fascia.
- Function: Show facial expressions, emotions, speech, mastication.
Branches of Facial Nerve
- Temporal
- Zygomatic
- Buccal
- Mandibular
- Cervical
Muscles Around the Mouth
-
Orbicularis Oris:
- Origin: Anterior nasal spine & midline above chin, superficial temporal arteries
- Insertion: Fibres in upper & lower lip
- Nerve: Facial, buccal branch
- Blood supply: Facial, maxillary & superficial temporal arteries
- Action: Elevation/depression, protrusion/compression of lips
-
Levator Labii Superioris:
- Origin: Lower rim of orbit
- Insertion: Orbicularis oris fibres in upper lip
- Nerve: Facial, zygomatic and buccal.
- Blood supply: Facial & maxillary arteries
- Action: Elevates upper lip
-
Depressor Labii Inferioris:
- Origin: Lowest portion of oblique line of mandible
- Insertion: Orbicularis oris fibres in lower lip
- Nerve: Facial, mandibular branch
- Blood supply: Facial & maxillary arteries
- Action: Depresses lower lip
-
Zygomaticus Minor:
- Origin: Zygomatic arch.
- Insertion: Orbicularis oris, upper fibres in upper lip.
- Nerve: Facial, buccal and zygomatic branches
- Blood supply: Facial artery.
- Action: Elevates upper lip.
-
Zygomaticus Major:
- Origin: Zygomatic arch
- Insertion: Orbicularis oris, at angle of mouth
- Nerve: Facial, buccal and zygomatic branches
- Blood supply: Facial artery
- Action: Elevates corners of mouth.
-
Levator Anguli Oris:
- Origin: Canine fossa of maxilla.
- Insertion: Orbicularis oris, corner of mouth.
- Nerve: Facial, buccal & zygomatic branches.
- Blood supply: Facial & maxillary arteries.
- Action: Elevates corners of mouth.
-
Depressor Anguli Oris:
- Origin: Below angle of mandible.
- Insertion: Orbicularis oris; corner of mouth.
- Nerve: Facial, buccal & mandibular branches.
- Blood supply: Facial & maxillary arteries.
- Action: Depresses corner of mouth.
-
Mentalis:
- Origin: Incisive fossa, anterior of mandible.
- Insertion: Skin covering chin.
- Nerve: Facial, mandibular branch
- Blood supply: Facial & maxillary arteries
- Action: Pulls skin of chin up; aids with clearing food from labial surface.
-
Buccinator:
- Origin: Pterygoimandibular raphae and buccal alveolar bone
- Insertion: Orbicularis oris; corners of mouth.
- Nerve: Facial, buccal branch
- Blood supply: Facial & maxillary arteries
- Action: Pulls corners of mouth back. Compresses cheek against molars buccally. Directs food to occlusal surface of molars.
-
Risorius:
- Origin: Angle of mandible.
- Insertion: Orbicularis oris; corners of mouth.
- Nerve: Facial, buccal branch
- Blood supply: Facial artery.
- Action: Retracts angle of mouth; smiling.
Muscles of the Scalp
-
Occipitofrontalis (Frontalis):
- Origin: Connective tissue of scalp.
- Insertion: Skin, frontal regions of eyebrows.
- Nerve: Facial, temporal branch.
- Blood supply: Facial, superficial temporal and opthalmic arteries
- Action: Pulls scalp up and back; elevates eyebrows.
Muscles of the Neck
-
Platysma:
- Origin: Clavicle & shoulder
- Insertion: Lower border of mandible, skin & muscle of lower face and mouth.
- Nerve: Facial, cervical branch.
- Blood supply: Facial artery & thyrocervical trunk.
- Action: Pulls down corners of mouth; wrinkles skin on chin and neck.
Muscles Around the Eyes
-
Orbicularis Oculi:
- Origin: Orbital bone of upper medial orbital margin.
- Insertion: Horseshoe shape circling eye.
- Nerve: Facial, zygomatic & temporal branches.
- Blood supply: Superficial temporal, facial and maxillary arteries.
- Action: Closes eye forcefully; closes eye gently (blinking).
-
Corrugator:
- Origin: Bridge of nose.
- Insertion: Skin of lateral part of eyebrow
- Nerve: Facial, temporal branch.
- Blood supply: Superficial temporal artery.
- Action: Pulls eyebrows medially (frown).
-
Procerus:
- Origin: Bridge of nose.
- Insertion: Medial end of eyebrows.
- Nerve: Facial, zygomatic branch.
- Blood supply: Facial artery.
- Action: Pulls eyebrows down (frown); wrinkles nose.
Muscles of the Nose
-
Nosalis:
- Origin: Dilator naris; nasal margin of maxilla.
- Insertion: Skin of nostril.
- Nerve: Facial, buccal branches.
- Blood supply: Facial artery.
- Action: Flares the nostrils.
- Origin: Compressor naris; midline over nasal cartilage, top of maxillary canine ridge.
- Insertion: Nasal cartilage.
- Nerve: Facial, buccal branches
- Blood supply: Facial artery
- Action: Closes the nostrils.
Muscles of the Ears
-
Anterior Auricular:
- Origin: Scalp and temporal fascia.
- Insertion: Anterior medial aspect of helix of ear.
- Nerve: Facial, temporal branch
- Blood supply: Posterior auricular artery.
- Action: Pulls ear slightly forward.
-
Superior Auricular:
- Origin: Scalp and temporal fascia.
- Insertion: Superior medial aspect of ear.
- Nerve: Facial, temporal branch.
- Blood supply: Posterior auricular artery
- Action: Raises the ear.
-
Posterior Auricular:
- Origin: Superior lateral aspect of mastoid process.
- Insertion: Inferior medial aspect of auricle of ear.
- Nerve: Facial, temporal branch.
- Blood supply: Posterior auricular artery.
- Action: Pulls ear back.
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Description
This quiz covers the anatomy of the muscles responsible for facial expressions, including their innervation and blood supply. Learn about the specific muscles around the mouth, their origins, insertions, and functions. Test your knowledge on the branches of the facial nerve and the actions of key muscles such as the orbicularis oris and levator labii superioris.
