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Head & Neck > 5) Muscles of Facial expression > Flashcards

5) Muscles of Facial expression Flashcards

1
Q

Which nerve innervates the muscles of facial expression?

A

Facial nerve CN VII

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2
Q

What is the embryonic origin of the muscles of facial expression?

A

2nd Pharyngeal arch

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3
Q

Which muscles form the orbital group?

A

Orbicularis Oculi
Corrugator supercilli
Occipitofrontalis

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4
Q

What is the function of orbicularis oculi?

A

Orbital & palpebral portion closes eyelids firmly & gently

Lacrimal portion compresses lacrimal sac, aids drainage of tears

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5
Q

What is the function of corrugator supercilli?

A

Draws eyebrows inferiorly & medially

Frowning/worried look

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6
Q

What is the function of occipitofrontalis?

A

2 bellies: occipital & frontal
Elevate eyebrows
Wrinkles on forehead (surprised look)

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7
Q

Which muscles form the oral group?

A 
Buccinator
Orbicularis oris
Risorius
Zygomaticus major & minor
Levator anguli oris
Depressor anguli oris
Mentalis
Platysma
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8
Q

What is the function of buccinator?

A

Presses cheek against molars
Keep food within occlusal surfaces & out of oral vestibule
Aids in smiling

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9
Q

What is the function of orbicularis oris?

A

Protrude/purses lips (kissing)

Attachment for muscles

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10
Q

What is the function of risorius?

A

Retracts angle of mouth to help produce a smile

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11
Q

What is the function of zygomaticus major & minor?

A

Dilators of mouth
Elevate upper lip:
Bilaterally - smile
Unilaterally - sneer

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12
Q

What is the function of levator anguli oris?

A

Dilates mouth

Widens oral fissure - grinning

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13
Q

What is the function of depressor anguli oris?

A

Depresses labial commissure bilaterally
A|lows frowning
Pulls corners of lips down (sad)

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14
Q

What is the function of mentalis?

A

Protrudes lower lip
Allows pout
Wrinkles skin of chin

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15
Q

What is the function of platysma?

A

Depresses & tenses skin of lower face & mouth

Aids forced depression of mandible

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16
Q

Which muscles form the nasal group?

A

Levator labii superioris alaseque nasi & alar part of nasalis
Procerus

17
Q

What is the function of Levator labii superioris alaseque nasi & alar part of nasalis?

A 
Depress alar laterally, dilating anterior nasal apertures
Flare nostrils (anger)
18
Q

What is the function of procerus?

A

Lowers eyebrows

Assists flaring of nostrils

Head & Neck (12 decks)

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