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Anatomy Exam 2 > Muscle Actions > Flashcards

Muscle Actions Flashcards

1
Q

What are the actions of the Frontal Belly of Occipitofrontalis?

A

1) Elevate eyebrows
2) Wrinkles skin of forehead

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2
Q

What are the actions of the Orbicularis Oculi?

A

Closes eyelids

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3
Q

What are the actions of the Platysma?

A

1) Depresses mandible
2) Tense skin of lower face and neck

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4
Q

What are the actions of the orbicularis oris?

A

1) Tonus closes oral fissure
2) Phasic contraction compresses and protrudes lips (kissing)
3) Resists distension (when blowing)

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5
Q

What are the actions of Levator anguli oris?

A

Elevates corners of mouth

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6
Q

What are the actions of depressor labii inferioris?

A

1) Depresses lower lip and/or
2) Everts lower lip

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7
Q

What are the actions of the depressor anguli oris?

A

1) Depresses angles of mouth

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8
Q

What are the actions of zygomaticus major?

A

Elevate angle of mouth

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9
Q

What are the actions of risorius?

A

Draw corner of mouth laterally

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10
Q

What are the actions of levator labii superioris?

A

1) Retract (elevate) upper lip

and/or

2) Evert upper lip

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11
Q

What are the actions of the masseter?

A

1) Elevate mandible,
2) Closing jaws
3) Limited protrusion of mandible

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12
Q

What is the action of the buccinator?

A

Keep cheek taut

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13
Q

What is the action of Inferior Oblique?

A

Abducts elevates laterally rotates eyeball

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14
Q

What is the action of Inferior Rectus?

A

Depresses adducts rotates eyeball laterally

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15
Q

What is the action of Lateral Rectus?

A

Abducts eyeball

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16
Q

What is the action of Levator Palpebrae Superioris?

A

Elevates superior eyelid

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17
Q

What is the action of Medial Rectus?

A

Adducts eyeball

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18
Q

What is the action of Orbicularis Oculi?

A

Closes eyelids

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19
Q

What is the action of Superior Oblique?

A

Abducts, depresses medially rotates eyeball

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20
Q

What is the action of Superior Rectus?

A

Elevates adducts rotates eyeball medially

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21
Q

What is the action of Tensor Tympani?

A

Pull handle of malleus medially to tense the tympanic membrane

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22
Q

What is the action of Stapedius?

A

Pulls stapes posteriorly, tightening anular ligament and reducing oscillatory range

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23
Q

What is the action of Levator Scapulae?

A

Elevate scapula, tilt glenoid cavity inferiorly

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24
Q

What is the action of Omohyoid?

A

Depresses, retracts, and steadies hyoid

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25
Q

What is the action of Platysma?

A

Depress mandible, tense skin of lower face and neck

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26
Q

What are the actions of the Scalenes?

A
  • Anterior: flex head
  • Middle: flex head and elevate 1st rib during forced inspiration
  • Posterior: flex head and elevate 2nd rib during forced inspiration
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27
Q

What is the action of Semispinalis Capitis?

A

Extend head, extend and contralaterally rotate cervical/thoracic regions of vertebral column

28
Q

What is the action of Splenius Capitis?

A
  • Unilateral: laterally flex neck and rotate head to side of active muscles
  • Bilateral: Extend head and neck
29
Q

What is the action of subclavius?

A

Anchors and depresses clavicle

30
Q

What is the action of Digastric?

A

Depresses mandible against resistance;

elevates and steadies hyoid during swallowing and speaking

31
Q

What is the action of Longus Capitis?

A

Flex head

32
Q

What is the action of Longus Colli?

A

Flexes neck, rotates contralaterally if acting unilaterally

33
Q

What is the action of Mylohyoid?

A

Elevates hyoid, floor of mouth and tongue during swallowing and speaking, depresses mandible

34
Q

What is the action of Omohyoid?

A

Depresses, retracts, and steadies hyoid

35
Q

What is the action of Sternocleidomastoid?

A

Laterally flex neck, flex neck and rotate so turned superiorly toward contralateral side

36
Q

What is the action of Sternohyoid?

A

Depress hyoid after elevation during swallowing

37
Q

What is the action of Sternothyroid?

A

Depress hyoid and larynx

38
Q

What is the action of Thyrohyoid?

A

Depresses hyoid and elevates larynx

39
Q

What is the action of Masseter?

A

Elevate mandible closing jaw, limited protrusion of mandible

40
Q

What is the action of Temporalis?

A

Elevates mandible closing jaw, posterior fibers retract mandible

41
Q

What is the action of Buccinator?

A

Keep cheek taut

42
Q

What is the action of Lateral Pterygoid?

A

Bilaterally protude mandible and depresses chin, unilaterally swings jaw to contralateral side

43
Q

What is the action of Medial Pterygoid?

A
  • Bilaterally elevates mandible; contributes to protrusion,
  • Unilaterally produces smaller grinding movements
44
Q

What is the action of Superior Pharyngeal Constrictor?

A

Constrict wall of pharynx during swallowing

45
Q

What is the action of Middle Pharyngeal Constrictor?

A

Constrict wall of pharynx during swallowing

46
Q

What is the action of Inferior Pharyngeal Constrictor?

A

Constrict wall of pharynx during swallowing

47
Q

What is the action of Levator Veli Palatini?

A

Elevates soft palate during swallowing and yawning

48
Q

What is the action of Palatoglossus?

A

Elevate posterior tongue and draws soft palate onto tongue

49
Q

What is the action of Palatopharyngeus?

A

Tenses soft palate and pulls walls of pharynx superiorly, anteriorly, and medially during swallowing

50
Q

What is the action of Salpingopharyngeus?

A

Elevate (shorten and widen) pharynx and larynx during speaking and swallowing

51
Q

What is the action of Styloglossus?

A

Retrudes tongue

52
Q

What is the action of Stylohyoid?

A

Depresses mandible against resistance when infrahyoid muscles fix or depress hyoid bone

53
Q

What is the action of Stylopharyngeus

A

Elevate (shorten and widen) pharynx and larynx during speaking and swallowing

54
Q

What is the action of Superior Pharyngeal Constrictor?

A

Constrict wall of pharynx during swallowing

55
Q

What is the action of Tensor Veli Palatini?

A

Tenses soft palate and opens mouth of pharyngotympanic tube during swallowing and yawning

56
Q

What is the action of Genioglossus?

A

Depress tongue, posterior part pulls tongue anteriorly for protrusion

57
Q

What is the action of Hyoglossus?

A

Depress tongue; helps retrude tongue

58
Q

What is the action of Styloglossus?

A

Retrudes tongue

59
Q

What is the action of Geniohyoid?

A

Pulls hyoid anterosuperiorly; shortens floor of mouth; widens pharynx

60
Q

What is the action of Cricothyroid?

A

Stretches and tenses vocal ligament

61
Q

What is the action of Lateral Cricoarytenoid?

A

Adducts vocal folds

62
Q

What is the action of Oblique Arytenoid?

A

Adducts arytenoid cartilages to close posterior rima glottides

63
Q

What is the action of Posterior Cricoarytenoid?

A

Abducts vocal folds

64
Q

What is the action of Thyroarytenoid?

A

Relaxes vocal ligament

65
Q

What is the action of Transverse Arytenoid?

A

Adducts arytenoid cartilages to close posterior rima glottides

66
Q

What is the action of Vocalis?

A

Relaxes posterior vocal ligament while maintaining (or increasing) tension of anterior part

67
Q

What is the action of Palatoglossus?

A

Elevate posterior tongue or depress soft palate

Anatomy Exam 2 (18 decks)

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