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254 midterm > facial muscles > Flashcards

facial muscles Flashcards

1
Q

what does scalp stand for

A

skin (sweat and sebaceous gland, abundant arterial supply, good venous and lymphatic drainage)
connective tissue (highly vascularized subcutaneous layer, well supplied with nerves)
aponeurosis (strong tendinous sheet)
loose areolar tissue (sponge like, allows mvt of 1st 3 layers)
pericranium (forms external periosteum of calvaria)

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2
Q

characteristics of facial expression muscles

A

provide us with the ability to express a wide variety of emotions
lies within the layers of superficial fascia
usually originates in fascia or on bones of skull and insert into the skin

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3
Q

which muscles of face expressions are the most important

A

most important are those surrounding orifices of the head (eyes, nose, mouth) like sphincters and dilators

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4
Q

glosso

A

tongue

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5
Q

labi

A

lip

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6
Q

genio

A

chin

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7
Q

mylo

A

mandible

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8
Q

occuli

A

eye

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9
Q

oris

A

mouth

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10
Q

sterno

A

sternum

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11
Q

stylo

A

styloid process

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12
Q

hyo

A

hyoid bone

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13
Q

omo

A

scapula

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14
Q

occipitofrontalis m. actions

A

frontalis: draws scalp ant, raises eyebrows and wrinkle skin of forehead horizontally
occipitalis; draws scalp post

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15
Q

what joins the frontalis and occipitalis m.

A

galia apeunaronica

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16
Q

orbicularis oris m. action

A

closes and protrudes lips, compresses lips against teeth and shapes lips during speech

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17
Q

zygomaticus major action

A

draws angle of mouth superiorly and laterally as in smiling or laughing

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18
Q

zygomaticus minor action

A

elevates upper lip, exposing maxillary teeth

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19
Q

levator anguli oris action

A

pulls the angle of the mouth upwards

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20
Q

levator labii superioris action

A

elevates upper lip

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21
Q

depressor labii inferioris action

A

depresses lower lip

22
Q

depressor anguli oris action

A

draws angle of mouth laterally and inferiorly as in opening mouth

23
Q

buccinator action

A

presses cheeks against teeth and lips (whistling, blowing and sucking), draws corner of mouth laterally and assists in mastication by keeping food btw teeth (and not btw teeth and cheeks)

24
Q

mentalis action

A

elevates and protrudes lower lip and pulls the skin of the chin up (pouting)

25
Q

risorius action

A

draws angle of the mouth laterally as in tenseness

26
Q

platysma action

A

draws outer part of lower lip inferiorly and posteriorly (pouting), depresses mandible

27
Q

orbicularis oculi action

A

closes the eye

28
Q

corrugator action

A

draws eyebow inf and wrinkles skin of forehead vertically as in frowning

29
Q

procerus action

A

wrinkles the skin btw the eyebrows

30
Q

what m. move the mandible (4)

A

masseter, temporalis, medial and lateral pterygoid

31
Q

masseter action

A

elevates mandible, as in closing mouth and retracts the mandible

32
Q

temporalis action

A

elevates and retracts mandible

33
Q

medial pterygoid action

A

elevates and protracts mandible and moves mandible from side to side

34
Q

lateral pterygoid action

A

protracts mandible, depresses mandible as in opening mouth and moves mandible from side to side

35
Q

what are the muscles of the tongue (4)

A

genioglossus
styloglossus
palatoglossus
hyoglossus

36
Q

genioglossus action

A

depresses tongue and thrusts it anteriorly

37
Q

styloglossus action

A

elevates tongue and draws it posteriorly

38
Q

palatoglossus action

A

elevates posterior portion of tongue and draws soft palate down on tongue

39
Q

hyoglossus action

A

depresses tongue and draws it down its sides

40
Q

what are the muscles of the floor of the oral cavity (4)

A

digastric (CN V, VII), stylohyoid (CN VII), mylohyoid (CN V) and geniohyoid (CN XII)

41
Q

digastric action

A

elevates hyoid bone and depresses mandible as in opening the mouth

42
Q

stylohyoid action

A

elevates hyoid bone and draws it posteriorly

43
Q

mylohyoid action

A

elevates hyoid bone and floor of mouth and depresses mandible

44
Q

geniohyoid action

A

elevates hyoid bone, draws hyoid bone and tongue anteriorly and depresses mandible

45
Q

sternocleidomastoid action

A

bilaterally: flex cervical portion of vertebral column, extend head, elevates sternum during forced inspiration
unilaterally: laterally flex and rotate head to side opposite contracting m.

46
Q

extrinsic muscles of larynx (infrahyoid)

A

omohyoid (C1-C3), sternohyoid (C1-C3), sternothyroid (C1-C3), thyrohyoid (CN XII, C1)

47
Q

omohyoid action

A

depresses hyoid bone

48
Q

sternohyoid action

A

depresses hyoid bone

49
Q

sternothyroid action

A

depresses thyroid cartilage of larynx

50
Q

thyrohyoid action

A

elevates thyroid cartilage and depresses hyoid bone

254 midterm (11 decks)

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