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Questions and Answers
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 Depressor anguli Oris muscle?
Which nerve supplies the Depressor anguli Oris muscle?
What is the insertion point of the Mentalis muscle?
What is the insertion point of the Mentalis muscle?
What role does the Buccinator muscle play in mastication?
What role does the Buccinator muscle play in mastication?
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Which arteries supply blood to the Mentalis muscle?
Which arteries supply blood to the Mentalis muscle?
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Which muscle is responsible for pulling the skin of the chin upward?
Which muscle is responsible for pulling the skin of the chin upward?
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What is the nerve supply of the Risorius muscle?
What is the nerve supply of the Risorius muscle?
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What action is associated with the Risorius muscle?
What action is associated with the Risorius muscle?
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The Orbicularis oris muscle is primarily responsible for which action?
The Orbicularis oris muscle is primarily responsible for which action?
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Which muscle acts to depress the corners of the mouth?
Which muscle acts to depress the corners of the mouth?
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Which of the following is NOT one of the branches of the facial nerves?
Which of the following is NOT one of the branches of the facial nerves?
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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 muscle primarily helps in the protrusion of the lips?
Which muscle primarily helps in the protrusion of the lips?
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Which artery is NOT involved in the blood supply to the muscles around the lips?
Which artery is NOT involved in the blood supply to the muscles around the lips?
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The facial nerve innervates all muscles of facial expression except for which of the following?
The facial nerve innervates all muscles of facial expression except for which of the following?
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Which of the following muscles is primarily responsible for elevating the upper lip?
Which of the following muscles is primarily responsible for elevating the upper lip?
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Which area of the face is NOT typically associated with the action of facial muscles?
Which area of the face is NOT typically associated with the action of facial muscles?
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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 nerve is responsible for the action of the procerus muscle?
Which nerve is responsible for the action of the procerus muscle?
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The depressive action on the lower lip is primarily performed by which muscle?
The depressive action on the lower lip is primarily performed by which muscle?
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What is the role of the compressor naris muscle?
What is the role of the compressor naris muscle?
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Which of the following statements about the facial artery is incorrect?
Which of the following statements about the facial artery is incorrect?
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Which of the following best describes the location of facial expression muscles?
Which of the following best describes the location of facial expression muscles?
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Where does the dilator naris muscle insert?
Where does the dilator naris muscle insert?
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Which artery supplies blood to the facial muscles, including the corrugator?
Which artery supplies blood to the facial muscles, including the corrugator?
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What action does the anterior auricular muscle perform?
What action does the anterior auricular muscle perform?
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Which muscle is responsible for pulling the eyebrows down?
Which muscle is responsible for pulling the eyebrows down?
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What is the origin point for the superior auricular muscle?
What is the origin point for the superior auricular muscle?
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Which nerve branch innervates the posterior auricular muscle?
Which nerve branch innervates the posterior auricular muscle?
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What action does the superior auricular muscle perform?
What action does the superior auricular muscle perform?
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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 nerves are associated with the action of raising the eyebrows?
Which nerves are associated with the action of raising the eyebrows?
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Which muscle is responsible for pulling down the corners of the mouth?
Which muscle is responsible for pulling down the corners of the mouth?
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What is the origin point of the platysma muscle?
What is the origin point of the platysma muscle?
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Which blood supply is associated with the platysma muscle?
Which blood supply is associated with the platysma muscle?
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What is the action of the orbicularis oculi muscle?
What is the action of the orbicularis oculi muscle?
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Where is the insertions point of the occipitofrontalis muscle primarily located?
Where is the insertions point of the occipitofrontalis muscle primarily located?
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Which of the following best describes the shape of the orbicularis oculi muscle?
Which of the following best describes the shape of the orbicularis oculi muscle?
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What type of tissue is primarily associated with the scalp?
What type of tissue is primarily associated with the scalp?
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Which nerve innervates the orbicularis oculi muscle?
Which nerve innervates the orbicularis oculi muscle?
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Study Notes
Muscles of Facial Expressions
- All muscles of facial expression are innovated by the facial nerve and supplied by the facial artery.
- Located in the subcutaneous fascia.
- Functions include:
- Showing facial expressions and emotions
- Speech
- Mastication
Mouth Muscles
-
Orbicularis Oris:
- Origin: anterior nasal spine & midline above chin.
- Insertion: fibers in upper and lower lip
- Nerve: facial, buccal branch
- Blood supply: facial, maxillary and superficial temporal arteries.
- Action: elevation/depression, protrusion/compression of the lips
-
Levator labii superioris:
- Origin: lower rim of orbit
- Insertion: orbicularis oris fibers in upper lip
- Nerve: facial, zygomatic and buccal branches
- Blood supply: facial and maxillary arteries.
- Action: elevates upper lip
-
Depressor labii inferioris:
- Origin: lowest portion of oblique line of mandible
- Insertion: orbicularis oris fibers in lower lip
- Nerve: facial, mandibular branch
- Blood supply: facial and maxillary arteries.
- Action: depresses lower lip
-
Zygomaticus minor:
- Origin: zygomatic arch
- Insertion: orbicularis oris; 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 and maxillary arteries.
- Action: elevates corners of mouth
-
Depressor anguli Oris:
- Origin: below angle of mandible
- Insertion: orbicularis oris; corner of mouth
- Nerve: facial, buccal and mandibular branches
- Blood supply: facial and 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 and maxillary arteries.
- Action: pulls skin of chin up
- Aids in 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 and 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.
Scalp Muscles
-
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
Neck Muscles
-
Platysma:
- Origin: clavicle & shoulder
- Insertion: lower border of mandible, skin & muscle of lower face and mouth
- Nerve: facial, cervical branch
- Blood supply: facial artery and thyrocervical trunk
- Action: pulls down corners of mouth, wrinkles skin on chin and neck.
Eye Muscles
-
Orbicularis Oculi:
- Origin: orbital bone of upper medial orbital margin
- Insertion: horseshoe shape circling eye.
- Nerve: facial, zygomatic and 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
Nose Muscles
-
Nosalis:
- Origin: dilator naris; nasal margin of maxilla
- Insertion: skin of nostril
- Nerve: facial, buccal branches
- Blood supply: facial artery.
- Action: flares nostrils.
-
Nosalis:
- Origin: compressor naris; midline over top of maxillary canine ridge
- Insertion: nasal cartilage
- Nerve: facial, buccal branches
- Blood supply: facial artery
- Action: closes the nostrils.
Ear Muscles
-
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
Test your knowledge on the muscles responsible for facial expressions with this quiz. Explore the anatomy, functions, innervation, and blood supply of key facial muscles such as the orbicularis oris and levator labii superioris. Perfect for students in anatomy or related fields.
