Muscles of Facial Expression revision notes quiz
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Muscles of Facial Expression revision notes quiz

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Questions and Answers

Which branch of the facial nerve innervates the muscles responsible for elevating the upper lip?

  • Buccal branch
  • Temporal branch (correct)
  • Mandibular branch
  • Cervical branch

    • What is the primary action of the Orbicularis Oris muscle?

  • Compression of the lips (correct)
  • Protrusion of the tongue
  • Depression of the lower lip
  • Elevation of the eyebrows

    • Which muscle is responsible for depressing the lower lip?

  • Zygomaticus major
  • Zygomaticus minor
  • Levator labii superioris
  • Depressor labii inferioris (correct)

    • Which artery supplies blood to the Zygomaticus major muscle?

    <p>Facial artery</p> Signup and view all the answers

    The Zygomaticus minor muscle originates from which anatomical structure?

    <p>Zygomatic arch</p> Signup and view all the answers

    The facial nerves are responsible for innovating which of the following muscle groups?

    <p>All muscles of facial expressions</p> Signup and view all the answers

    What action does the Zygomaticus major muscle perform?

    <p>Elevates the corners of the mouth</p> Signup and view all the answers

    Which of the following is NOT a function of the facial muscles?

    <p>Breathing</p> Signup and view all the answers

    The blood supply to the Levator labii superioris is derived from which arteries?

    <p>Facial and maxillary arteries</p> Signup and view all the answers

    Which branch of the facial nerve innervates the Depressor labii inferioris muscle?

    <p>Buccal branch</p> Signup and view all the answers

    What is the primary action of the Levator anguli Oris muscle?

    <p>Elevates corners of the mouth</p> Signup and view all the answers

    Which blood vessels supply the Depressor anguli Oris muscle?

    <p>Facial and maxillary arteries</p> Signup and view all the answers

    What is the insertion point for the Mentalis muscle?

    <p>Skin covering the chin</p> Signup and view all the answers

    Which nerve branch innervates the Buccinator muscle?

    <p>Facial nerve, buccal branch</p> Signup and view all the answers

    The main function of the Risorius muscle is to:

    <p>Retract the angle of the mouth</p> Signup and view all the answers

    Where does the Buccinator muscle originate?

    <p>Alveolar bone</p> Signup and view all the answers

    The action of the Mentalis muscle includes which of the following?

    <p>Pulling skin of chin up</p> Signup and view all the answers

    Which type of branches innervate the Levator anguli Oris muscle?

    <p>Facial, buccal, and zygomatic branches</p> Signup and view all the answers

    Which action does the Depressor anguli Oris perform?

    <p>Depresses the corner of the mouth</p> Signup and view all the answers

    What is the primary blood supply to the Risorius muscle?

    <p>Facial artery</p> Signup and view all the answers

    What is the primary action of the occipitofrontalis muscle?

    <p>Pulls scalp up and back</p> Signup and view all the answers

    Which nerve is responsible for the action of the platysma muscle?

    <p>Facial nerve, cervical branch</p> Signup and view all the answers

    Which structure does the orbicularis oculi muscle originate from?

    <p>Orbital bone of the upper medial margin</p> Signup and view all the answers

    How does the platysma affect facial expression?

    <p>Pulls down corners of the mouth</p> Signup and view all the answers

    What is the primary action of the corrugator muscle?

    <p>Pulls eyebrows medially</p> Signup and view all the answers

    Which artery supplies blood to the occipitofrontalis muscle?

    <p>Facial artery</p> Signup and view all the answers

    Which muscle is responsible for closing the nostrils?

    <p>Compressor naris</p> Signup and view all the answers

    What shape does the orbicularis oculi muscle take?

    <p>Horseshoe</p> Signup and view all the answers

    What nerve innervates the superior auricular muscle?

    <p>Facial, temporal branch</p> Signup and view all the answers

    What action does the orbicularis oculi perform?

    <p>Closes eye forcefully</p> Signup and view all the answers

    Where does the platysma muscle insert?

    <p>Lower border of the mandible</p> Signup and view all the answers

    What is the action of the procerus muscle?

    <p>Pulls the eyebrows down</p> Signup and view all the answers

    Which artery supplies the corrugator muscle?

    <p>Superficial temporal artery</p> Signup and view all the answers

    Which of the following is NOT an action of the platysma muscle?

    <p>Elevates eyebrows</p> Signup and view all the answers

    The primary blood supply for the orbicularis oculi muscle comes from which artery?

    <p>Facial artery</p> Signup and view all the answers

    What is the primary action of the dilator naris muscle?

    <p>Flares the nostrils</p> Signup and view all the answers

    Where does the anterior auricular muscle originate?

    <p>Scalp and temporal fascia</p> Signup and view all the answers

    What action is performed by the posterior auricular muscle?

    <p>Pulls the ear back</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the compressor naris muscle?

    <p>Facial, buccal branches</p> Signup and view all the answers

    What is the origin of the nasalis muscle?

    <p>Nasal margin of maxilla</p> Signup and view all the answers

    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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    Muscles of Facial Expression Revision PDF

    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.

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