Muscles Of Facial Expression Flashcards by Emily H

5 branches of facial nerves

Temporal
Zygomatic
Buccal
Mandibular
Cervical

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Functions of facial expression muscles

Show emotions and expressions
Speech
Mastication

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Where do the muscles of facial expressions lie?

Subcutaneous fascia (superficial layer)

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Orbicularis oris origin and insertion

Origin - anterior nasal spine and midline above chin.

Insertion - fibres interlace with muscles around lips.

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Levator Labii Superioris origin and insertion

Origin - lower rim of orbit

Insertion - fibres of orbicularis oris at upper lip.

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Depressor Labii Inferioris origin and insertion

Origin - Beneath lowest part of oblique line of mandible

Insertion - Orbicularis oris in lower lip.

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Zygomaticus minor origin and insertion

Origin - zygomatic arch

Insertion - orbicularis oris (upper fibres)

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Zygomaticus major origin and insertion

Origin - zygomatic arch

Insertion - orbicularis oris at angle of mouth

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Levator anguli oris origin and insertion

Origin - canine fossa of maxilla

Insertion - orbicularis oris at corner of mouth

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Depressor anguli oris origin and insertion

Origin - beneath angle of mandible

Insertion - angles of mouth and blends with orbicularis oris

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Mentalis origin and insertion

Origin - anterior surface of mandible (incisive fossa)

Insertion - skin covering skin

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Buccinator origin and insertion

Origin - pterygomandibular raphae and buccal alveolar bone.

Insertion - orbicularis oris at corner of mouth.

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How does the buccinator aid in mastication

Works in opposition with tongue to direct food to occlusal surfaces of teeth

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Risorius origin and insertion

Origin - angle of mandible

Insertion - orbicularis oris at corners of mouth

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Muscles that lie in the subcutaneous fascia can be divided into which groups

Mouth
Scalp
Neck
Eyes
Nose
Ears

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3 parts of occipitofrontalis and the part associated with facial expressions

Frontalis (ass. with facial expressions)
Occipitalis
Galea aponeurotica

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Occipitofrontalis origin and insertion

Origin - connective tissue of scalp

Insertion - skin of frontal regions of eyebrows

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How many facial expression muscles are associated with the mouth

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How many facial expression muscles are associated with the scalp

1
Occipitofrontalis

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How many facial expression muscles are associated with neck

1
Platysma

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Platysma origin and insertion

Origin - clavicle and shoulder

Insertion - lower border of mandible, skin and muscle of lower face and mouth

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How many facial expression muscles are associated with the eyes

3
Orbicularis oculi
Corrugator
Procerus

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Orbicularis oculi orbital

Horseshoe shape encircling eye.

Closes eye forcefully.

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Orbicularis oculi innervation and blood supply

Nerve - facial nerve; zygomatic and temporal branches

Blood supply - superficial temporal, facial and maxillary arteries

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Corrugator origin and insertion

Origin - bridge of nose Insertion - skin of lateral part of eyebrow

Procerus origin and insertion

Origin - bridge of nose Insertion - medial end of eyebrows

Muscle of facial expression associated with the nose

Nasalis 2 parts - dilator naris and compressor naris

Nerve and blood supply of nasalis

Innervation - Facial nerve; buccal branches Blood supply - Facial artery

Dilator naris (Origin, insertion and action)

Origin - nasal margin of maxilla Insertion - skin of nostril Actions - flares the nostril

Compressor naris (Origin, insertion and action)

Origin - top of maxillary canine ridge Insertion - midline over nasal cartilage Action - closes nostrils

What facial muscles act on external ear

Anterior auricular Superior auricular Posterior auricular

Anterior auricular (Origin, insertion, action, innervation and blood supply)

Origin - scalp and temporal fascia Insertion - anterior medial aspect of helix of ear Action - pulls ear forward slightly Innervation - facial nerve; temporal branch Blood supply - posterior auricular artery

Superior auricular (Origin, insertion, action, innervation and blood supply)

Origin - scalp and temporal fascia Insertion - superior medial aspect of ear Action - raises the ease Nerve supply - facial nerve; temporal branch Blood supply - posterior auricular artery

Posterior auricular (Origin, insertion, action, innervation and blood supply)

Origin - superior lateral aspect of mastoid process Inversion - inferior medial aspect of auricle in ear Action - pulls ear back Innervation - facial nerve; temporal branch Blood supply - posterior auricular artery

Conditions that may affect functionality of facial muscles and how can they impact the patient and clinician

Bell’s Palsy Stroke Surgery - difficulties swallowing, talking, smiling. - communication, injections may be more difficult.

Orbicularis oris action

Closed and opens mouth (elevates and depresses). Compression and protrusion of lips.

Orbicularis oris nerve supply

Facial nerve; buccal branch.

Orbicularis oris blood supply

Facial, maxillary and superficial temporal arteries.

Which muscle circles the oral cavity in lip tissue

Orbicularis oris

Levator Labii Superioris action

Elevates upper lip

Levator Labii Superioris innervation

Facial nerve; zygomatic and buccal branches.

Levator Labii Superioris blood supply

Facial and maxillary arteries.

Depressor Labii Inferioris action

Depresses lower lip

Depressor Labii Inferioris innervation

Facial nerve; mandibular branch.

Depressor Labii Inferioris blood supply

Facial and maxillary arteries.

Zygomaticus minor action

Elevate upper lip.

Zygomaticus minor innervation

Facial nerve; buccal and zygomatic branches.

Zygomaticus minor blood supply

Facial artery.

Zygomatic major action

Elevates corners of mouth

Zygomatic major innervation

Facial nerve; buccal and zygomatic branches.

Zygomatic major blood supply

Facial artery

Levator anguli oris action

Elevates corner of mouth

Levator anguli oris innervation

Facial nerve; buccal and zygomatic branches.

Levator anguli oris blood supply

Facial and maxillary arteries.

Depressor anguli oris action

Depresses corner of mouth

Depressor anguli oris innervation

Facial nerve; buccal and mandibular branches.

Depressor anguli oris blood supply

Facial and maxillary arteries

Mentalis action

Pulls skin of chip up

Mentalis innervation

Facial nerve; mandibular branch.

Mentalis blood supply

Facial and maxillary arteries.

Buccinator action

Pulls corner of mouth bank. Compresses check against buccal surfaces of molars.

Buccinator innervation

Facial nerve; buccal branch.

Buccinator blood supply

Facial and maxillary arteries.

Risorius action

Retracts angle of mandible (smiling)

Risorius innervation and blood supply

Innervation - facial nerve; buccal branch Blood supply - facial artery.

Occipitofrontalis action

Pulls scalp back. Elevates eyebrows. (Wrinkles scalp)

Occipitofrontalis innervation

Facial nerve; temporal branch.

Occipitofrontalis blood supply

Superficial temporal and ophthalmic arteries.

Platysma action

Pulls corners of mouth down. Wrinkles skin of chin and neck.

Platysma innervation and blood supply

Innervation - facial nerve; cervical branch. Blood supply - facial artery; thyrocervical trunk.

Orbicularis oculi palpebrae

Arches laterally within eyelid. Closes eye gently (blinking).

Corrugator action

Pulls eyebrows medially.

Corrugator innervation and blood supply

Nerve supply - facial nerve; temporal branch Blood supply - superficial temporal artery

Procerus action

Pulls eyebrows down. Wrinkles nose.

Procerus innervation and blood supply

Nerve supply - facial nerve; zygomatic branch Blood supply - facial artery