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MBBS2/ANATOMY~HEAD & NECK > Muscles of Facial expression and mastication > Flashcards

Muscles of Facial expression and mastication Flashcards

1
Q

muscles of facial expression develop from

A

2nd branchial arch

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2
Q

muscles of facial expression are supplied by what nerve

A

CN VII

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3
Q

what are muscles of facial expression like

where do muscles for facial expression originate from and insert

A

thin

facial bones to insert on facial skin ( except platysma)

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4
Q

what are the facial muscle groups

A

muscle of the forehead (frontais as part of occipitofrontalis)

muscles of the mouth

muscles of the eyelids

muscles of the nose

platysma

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5
Q

what are the muscles of the mouth

A

-orbicularis oris
-zygomaticus major
-zygomaticus minor
-levator labii superioris
-levator labii superioris alaque nasi
-buccinator
-depressor anguli oris
-depressor labii inferioris
-mentalis
-risorius
-platysma

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6
Q

what are the muscles of the eyelids

A

orbicularis ocui which has an orbital and palpebral part

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7
Q

where does orbicularis oculi origin and insert

A

medial palpebral ligament to insert on lateral palpebral raphe

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8
Q

what muscles are around the eye and what do they do

A

corrugator supercilii- draws eyebrows together

orbicularis oculi- closes the eyes

procerus- pulls down the skin of the forehead

nasalis- widens the nostrils

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9
Q

whats the origin and insertion of risorius muscle and what does it do

A

parotid fascia and buccal skin to insert at angle of mouth

its part of the dilators of mouth (for smiling)

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10
Q

what is the origin and insertion of the depressor anguli oris and what does it do

A

anterolateral base of mandible to insert in angle of mouth

it depresses labial commissure bilaterally to from (makes you look sad)

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11
Q

whats the origin and insertion of procerus + transverse part of nasalis and whats its action

A

fascia aponeurosis covering nasal bone and lateral nasal cartilage to insert in skin of inferior forehead between eyebrows

it depresses medial end of eyebrows, wrinkles skin over dorsum of nose (makes you show dislike)

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12
Q

whats the origin and insertion of the alar part of nasalis + levator labii superioris alaeque nasii and whats its action

A

frontal process of maxilla to insert in major alar cartilage

it depresses ala laterally, dilating anterior nasal aperture i.e. flaring nostrils (makes you show anger)

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13
Q

whats the origin and insertion of orbicularis oris and whats its action

A

medial maxilla and mandible + deep surface of peri oral skin + angle of mouth (modiolus) to insert in mucous membrane of lips

tonus closes oral fissure
phasic contraction compresses and protrudes lips (kissing) or resists distension (when blowing)

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14
Q

whats the origin and insertion of orbicularis oculi and whats its action

A

medial orbital margin+ medial palpebral ligament + lacrimal bone to insert in skin around margin of orbit + superior and inferior tarsal plates

it closes eyelids i.e. palpebral part does so gently and orbital part tightly ( makes you wink)

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15
Q

whats the origin and insertion of depressor labii inferioris and what is its action

A

platysma and anterolateral body of mandible to insert in skin of lower lip

its part of the dilators of the mouth
it retracts (depresses) and/ everts lower lip ( pouting, sadness)

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16
Q

whats the origin and insertion of the zygomaticus major and whats its action

A

lateral aspect of zygomatic bone to insert in angle of mouth

its part of dilators of mouth
it elevates labial commissure bilateral to smile (happiness)
unilaterally to sneer (shows disdain)

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17
Q

whats the origin and insertion of platysma and what is its action

A

subcutaneous tissue of infraclavicular and supraclavicular regions to insert in base of mandible + skin of cheek and lower lip + angle of mouth + orbicularis oris

it depresses mandible (against resistance)
it tenses skin of inferior face and neck (showing tension and stress)

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18
Q

whats the origin and insertio of the corrugator supercilii muscle and its action

A

frontal bone at the medial end of the superciliary arch to insert in skin above the middle of the supraorbital margin

it draws eyebrow medially and inferiorly creating vertical wrinkles above nose (showing concern or worry)

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19
Q

whats the arterial and nerve supply of corrugator supercilii

A

branches from the superficial temporal and ophthalmic arteries

temporal branches of the facial nerve

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20
Q

whats the buccal pad fat

A

brown fat for heat generation especially for children

21
Q

where is the buccal pad fat

A

between masseter and buccinator muscles

22
Q

whats the arterial supply of the scalp

A

branches of either the external carotid artery / ophthalmic artery which is a branch of the internal carotid artery

23
Q

what arteries of the face come from the external carotid artery

A

facial artery
superficial temporal artery
transverse facial artery

24
Q

what arteries of the face come from the internal carotid artery

A

supraorbital artery
supratrochlear artery

25
Q

what are the 2 important veins of the face

A

facial vein
retromandibular vein

26
Q

facial veins have no

A

valves

27
Q

what are the connections of the veins of the face

A

connection of facial veins, pterygoid plexus and cavernous sinus

28
Q

whats the lymph drainage of the face

A

submental lymph nodes
submandibular lymph nodes
parotid lymph nodes

29
Q

where is the parotid duct

A

1 finger breadth below zygomatic arch

30
Q

where does the parotid duct open into

A

mouth cavity at level of the 2nd molar tooth

31
Q

where does the facial nerve come out from

A

stylomastoid foramen

32
Q

what are the 5 branches of the facial nerve

A

temporal
zygomatic
buccal
mandibular
cervical

33
Q

lesions of the facial nerve cause

A

Bell’s palsy

34
Q

whats facial palsy

A

weakness of the facial muscles resulting from temporary or permanent damage to the facial nerve

35
Q

what is Bell’s palsy

A

a condition in which the muscles on side of your face become weak or paralyzed causing them to droop or become stiff on that side due to damage of facial nerve

36
Q

what are signs of Bell’s palsy

A

no wrinkle of forehead

angle of mouth drops

sagging pf lower eyelid

other signs relating to malfunctions of structures innervated by the facial nerve

37
Q

what innervates frontalis

A

temporal branch

38
Q

what innervates orbicularis oculi

A

temporal branch
zygomatic branch

39
Q

what innervates zygomaticus major and minor + levator labii superioris and levator labii superioris alaeque nasi

A

zygomatic branch

40
Q

what innervates buccinator

A

buccal branch

41
Q

what innervates orbicularis oris

A

buccal branch

42
Q

what innervates depressor anguli oris + depressor labii inferioris + mentalis muscles

A

marginal mandibular branch

43
Q

what innervates platysma

A

cervical branch

44
Q

what are the sensory branches of the trigeminal nerve

A

ophthalmic (v1)
maxillary (v2)
mandibular (v3)

45
Q

the trigeminal nerve is motor to 1st branchial arch which is

A

the muscles of mastication i.e.
masseter
temporalis
medial pterygoid
lateral pterygoid

46
Q

where does the ophthalmic branch exist

A

superior orbital fissure

47
Q

where does the maxillary branch exist

A

foramen rotundum

48
Q

where does the mandibular branch exist

A

foramen ovale

MBBS2/ANATOMY~HEAD & NECK (13 decks)

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