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gross anat B2 > muscles of facial expression > Flashcards

muscles of facial expression Flashcards

1
Q

Name the muscles of facial expression

A

Muscles of Eyelids
* Orbicularisoculi
* Occipitofrontalis
* Corrugatorsupercilli
* Levatorpalpebraesuperioris

Nasal Muscles
-Procerus
-Nasalis
-Depressor septi

Muscles of Lips and Cheeks
* Levator Labii superioris alaque nasi
* Levator Labii superioris
* Zygomaticus Minor
* Zygomaticus Major
* Levator anguli oris
* Depressor labii Inferioris
* Depressor anguli oris
* Risorius
* Mentalis
* Buccinator
* Orbicularis oris

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2
Q

Fibers of these muscles converge to angle of the mouth & interlace to form- Modiolous

A
  • Levator anguli oris
  • Zygomaticus major
  • Buccinator
  • Depressor anguli oris
  • Risorius
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3
Q

ORBICULARIS OCULI

A

Orbital part
origin: Medial Palpebral lig ,Frontal bone and Maxilla
insertion:Fibers elliptical arranged without interruption laterally

Palpebral part
O:Medial Palpebral lig
I:Lateral Pelpebral raphe

Lacrimal Part-Lies behind the lacrimal sac
O:Crest of lacrimal bone, Lacrimal fascia
I:Lateral Pelpebral raphe

action:
* Entire Muscle:
a. Acts as sphincter- protects the eye from intense light &
from injury
b. Draws the skin of forehead, temple & cheek towards medial angle of eye- produces radiating skin folds at the lateral angle of eyes- Crow’s Feet
* Palpebral Part- Gentle closure of eyelids- blinking or sleep
* Lacrimal part- facilitates transport of lacrimal fluid

N: temporal n zygomatic br of facial. N

Paralysis of orbicularis oculi:
Ectropion- Drooping of lower eyelid
Epiphora- Spilling of tears

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4
Q

Corrugator Supercilli

A

O:Medial End of the superciliary arch of the frontal bone
I: subcutaneous tissues of the eyebrow
N: temporal br
A:Drags the eyebrow downwards and medially- Vertical wrinkles of forehead

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5
Q

Occipito- Frontalis

A

Occipital belly
O:Superior nuchal line of occipital bone and Mastoid bone
I:Epicranial aponeurosis

Frontal Belly
O:Skin & subcutaneous tissues of eyebrow & root of nose
I:Epicranial aponeurosis
N: frontalis

A:* Alternate contraction- forward and backward movement of entire scalp
-transverse wrinkles of forehead
* Frontal Belly – from above- raises eyebrow as in surprise

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6
Q

LEVATOR PALPEBRAE SUPERIORIS

A
  • Origin- Lesser wing of the sphenoid bone
  • Insertion – Medial Palpebral lig. and zygomatic bone
  • Nerve supply: oculomotor nerve
  • Elevates the upper eyelid
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7
Q

Levator Labii superioris alaeque nasi:

A

Origin: maxilla
Insertion: Ala of the nose & skin
of the upper lip
Actions: Elevates & everts upper lip, Dilates the nostril
N: upper buccal br

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8
Q

Levator Labii superioris

A

Origin: lower margin of the
orbit
Insertion: upper lip
A:Elevates & everts the upper lip Increases the naso labial furrow
N: upper buccal

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9
Q

Zygomaticus minor

A
  • Origin: Zygomatic bone
  • Insertion: Upper lip
    N: upper buccal
    Actions:
    Elevates & everts the upper lip Increases the naso labial furrow
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10
Q

Levator Anguli oris

A
  • Origin: Maxilla- just below infra orbital foramen
  • Insertion- Angle of mouth, fibers also extend to skin of lower lip upto mid line
    N: upper buccal br
  • Actions:
    Raises the angle of the mouth
    Levator anguli oris+ levator labii superioris + zygomaticus minor- Accentuates nasolabial furrow as in SADNE
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11
Q

Zygomaticus Major

A

Origin- Zygomatic bone
* Insertion- Angle of mouth
* Actions:
Draws the angle of the mouth upward & laterally – as in
laughing
N: upper buccal br

C:Spasm of this muscle in case of tetanus- risus sardonicus

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12
Q

Depressor Labii Inferioris

A

Depressor Labii Inferioris
Origin: oblique line of mandible
Insertion: Skin of the lower lip
N: marginal mandibular
Actions: draws the lower lip downward & laterally- as in irony

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13
Q

Depressor anguli oris

A

Origin: posterior part oblique line of mandible
Insertion: Angle of mouth & Skin of the upper lip
N: marginal mandibular
Actions: draws the lower lip downward & laterally- as in Sadness

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14
Q

Risorius

A
  • Origin : Parotid fascia- continuation of posterior fibers of platysma
  • Insertion: angle of mouth
    N: marginal mandibular
  • Action: Retracts the angle of mouth as in grinning
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15
Q
  • Mentalis:
A
  • Muscle of chin
  • Origin: incisive fossa of mandible
  • Insertion: skin of chin
    N: marginal mandibular
  • Action: puckers the chin
    Protrudes lower lip
    in drinking or in expression of disdain
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15
Q

Buccinator- VERY IMPORTANT!

A

Origin:
1. Outer surface of alveolar processes of maxilla and mandible opposite to 3rd molar teeth
2. Pterygomanibular raphe
3. Fibrous band from pterygoid hamulus to maxillary tuberosity

Insertion:
Upper or maxillary fibers – upperlip
Intermediate fibers- Chiasmatic decussation at modiolous
Upper fibers- lower lip
Lower fibers- Upper lip
mandibular fibers- lower lip

-Outer surface covered by BUCCOPHARYNGEAL fascia. separated from mandible & masseter by Buccal pad of fat
- Inner surface- covered by Mucous membrane
N: lower buccal br
Actions:
a. Flatens the cheek against gum & teeth- helps in mastication- by preventing accumulation of food in vestibule of mouth
b. Forcibly expels air b/w lips from inflated vestibule- as in blowing trumpet

Structures Piercing :
a. Parotid duct
b. Buccal branch of mandibular nerve
c. mucous glands around parotid duct

16
Q

Oribicularis oris

A

Extrinsic part - 3 strata- Deepest , intermediate, superficial
* Intrinsic part

  • Origin:
  • Deepest strata: incisive fossa of maxilla and mandible – fibers pass laterally & continuous with other muscles at lateral angle of mouth.
  • Intermediate strata: derived from buccinator muscle
  • Superficial strata: formed by levator & depressor anguli oris

Intrinsic part- fibers extend from skin to mucous membrane of the lip
N: buccal n marginal mandibular
Actions:
* Closes the lips
* Deep strata-Compress the lips against the teeth & help in mastication
* Superficial strata- Protrudes the lips- as in pursing
* Helps in articulation of speech
* KISSING

17
Q

procerus

A

O: fascia covering the nasal bone
I: skin between eyebrows
A: transverse wrinkles across the nose- frowning
N: upper buccal

18
Q

nasalis compressor naris

A

O: maxilla
I: cont. with opp muscle
A:compress the nasal aperture
N: upper buccal

19
Q

nasalis dilator naris

A

O: Maxilla
I: Alar cartilage
A: dilates the anterior nasal aperture- anger
N: upper buccal

20
Q

depressor septi

A

O:Maxilla-incisive fossa
I: mobile part of nasal septum
A: dilates the ant. nasal aperture- anger
N: upper buccal

gross anat B2 (15 decks)

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