The face Flashcards

1
Q

Muscles of facial expression:

  1. attachments
  2. movements
  3. innervations
A
  • attachments are btw skull & overlying skin
  • muscle contracts, skin moves (rather than a joint
  • innervated by CN VII facial nerve
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2
Q

occipitofrontalis

A
  • elevates eyebrows and skin of forehead

- as in surprised or doubtful look

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3
Q

Procerus

A
  • depresses skin btw eyebrows

- as in a look of anger

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4
Q

Orbicularis Oculi

A
  • closes eyelids
  • palpebral- gentle
  • orbital- tight
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5
Q

orbicularis oris

A

-compresses and protrudes the lips as in puckering/tightly closing lips

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6
Q

Buccinator

A
  • presses cheek against molar teeth

- keeps cheek taut when blowing

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7
Q

zygomaticus major

A

-pulls superiorly on upper lip as in smiling

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8
Q

levator labii superioris

A
  • elevates lips, dilates nostrils, raises angle of the mouth

- as in Elvis, sneering

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9
Q

depressor labii inferioris

A

-pulls lower lips inferiorlu (to show lower teeth)

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10
Q

depressor anguli oris

A

-pulls corners of mouth inferiorly, as in frowning

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11
Q

mentalis

A

-elevates and protrudes lower lip as in a pout

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12
Q

platysma

A
  • tenses skin of lower face and neck, depresses mandible

- as in a grimace

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13
Q

Facial nerve CN VII

  1. function/innervation
  2. cranial exit
A
  1. function/innervation
    - somatic motor
    - muscles of facial expression
    - stylohyoid m.
    - posterior digastric m.
  2. cranial exit
    - into the internal acoustic meatus (temporal bone)
    - out of the stylomastoid foramen (temporal bone)
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14
Q

Bell’s palsy

A
  • paralysis of facial nerve
  • caused by exposure to cold; common in 20-50 age group
  • most recover within 2-8 wks; some may take 1-2 years to recover
  • inability to raise eyebrow or generate wrinkles on the forehead
  • difficulty closing eye and inability to raise corner of mouth
  • drooping at the corner of mouth and inability to completely close eye
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15
Q

Parotid gland and duct

A
  • largest salivary gland
  • parotid duct crosses surface of masseter then pierces through buccinator to drain saliva into mouth near 2nd upper molar
  • facial nerve is embedded within gland, but does not innervate it
  • parotid gland innervated by glossopharyngeal n. (CN IX)
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16
Q

arteries of face

A
  • common carotid a.
  • internal & external carotid aa.
  • facial a.
  • maxillary a. (deep within cheek)
  • superficial temporal a.

-facial wounds bleed freely and heal quickly because of numerous anastomoses