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Dental Tissues > Muscular System P1 > Flashcards

Muscular System P1 Flashcards

1
Q

SCM origin

A

Medial part of the clavicle and sternum’s superior and lateral surface

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2
Q

SCM insertion

A

Mastoid process of the temporal bone

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3
Q

Trapezius origin

A

External surface of the occipital bone and posterior midline of the cervical and thoracic regions

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4
Q

Trapezius insertion

A

Lateral third of the clavicle and parts of the scapula

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5
Q

Epicranius origin

A

Superior nuchal line of the occipital bone and the mastoid process of the temporal bone

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6
Q

Epicranius insertion

A

The skin of the eyebrow and root of the nose

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7
Q

Orbicularis oculi origin

A

Orbital rim
Nasal process of the frontal bone
Frontal process of the maxilla

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8
Q

Orbicularis oculi insertion

A

The skin at the lateral canthus

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9
Q

Corrugator supercilii origin

A

The supraorbital region of the frontal bone

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10
Q

Corrugator supercilii insertion

A

The skin of the eyebrow

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11
Q

Orbicularis oris origin

A

Facial modiolus at the labial commissure

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12
Q

Orbicularis oris insertion

A

The tissues of the upper and lower lips

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13
Q

Buccinator origin

A

Alveolar process of the maxilla
Alveolar process of the mandible
Pterygomandibular raphe/fold

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14
Q

Buccinator insertion

A

The tissues of the orbicularis oris at the corners of the mouth

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15
Q

Risorius origin

A

The fascia superficial to the masseter

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16
Q

Risorius insertion

A

The skin at the ipsilateral labial commissure at the facial modiolus

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17
Q

Levator labii superioris origin

A

The infraorbital rim of the maxilla

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18
Q

Levator labii superioris insertion

A

The skin at the ipsilateral labial commissure at the facial modiolus

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19
Q

Levator labii superioris alaeque nasi origin

A

The frontal process of the maxilla

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20
Q

Levator labii superioris alaeque nasi insertion

A

The skin at the ala of the nose
The skin at the upper lip

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21
Q

Zygomaticus major origin

A

Zygomatic bone

22
Q

Zygomaticus major insertion

A

The skin at the ipsilateral labial commissure and the facial modiolus, in and around the orbicularis oris

23
Q

Zygomaticus minor origin

A

The body of zygomatic bone, medial to zygomaticus major muscle

24
Q

Zygomaticus minor insertion

A

The skin at the upper lip adjacent to the insertion of the levator labii superioris

25
Q

Levator anguli oris origin

A

The body of the canine fossa of the maxilla, usually superior to the root of the maxillary canine

26
Q

Levator anguli oris insertion

A

The skin at the ipsilateral labial commissure at the facial modiolus

27
Q

Depressor anguli oris origin

A

The body of the inferior border of the mandible

28
Q

Depressor anguli oris insertion

A

The skin at the ipsilateral labial commissure at the facial modiolus

29
Q

Depressor labii inferioris origin

A

The body of the inferior border of the mandible

30
Q

Depressor labii inferioris insertion

A

The skin of the lower lip

31
Q

Mentalis origin

A

The anterior mandible near the midline

32
Q

Mentalis insertion

A

The skin of the chin

33
Q

Platysma origin

A

The skin superficial to the clavicle and shoulder

34
Q

Platysma insertion

A

The muscles surrounding the mouth, including the facial modiolus

35
Q

SCM action

A
  • One muscle contracts: bend to the unilateral side; face and front of the neck rotate to contralateral side
  • Both muscles contract: head flexes at neck, and extend at the junction of the neck and skull
  • Elevate the thorax during breathing
36
Q

Trapezius action

A

Lift the clavicle and scapula (shrugging)

37
Q

Epicranius action

A

Raise the eyebrows and scalp (surprise expression)

38
Q

Orbicularis oculi action

A
  • closing the eyelid
  • squinting
39
Q

Corrugator supercilii action

A

Draws the skin of the eyebrow medially and inferiorly toward the nose
- vertical wrinkles in the glabella area of the forehead
- horizontal wrinkles at the bridge of the nose

40
Q

Orbicularis oris action

A
  • pressing lips together (closing)
  • tightening and thinning lips (pursing)
  • rolling lips inward between the teeth
  • pouting and thrusting lips outward (kissing)
41
Q

Buccinator action

A
  • pulls the labial commissure laterally, shortening and compressing the cheek
  • keeps food in the correct position during chewing (assists the muscles of mastication)
  • forcefully expells air (trumpet muscle)
  • suction
42
Q

Risorius action

A
  • stretches the lips laterally, widening the mouth
  • grimace or stretched out grin
43
Q

Levator labii superioris action

A

Elevates the upper lip in a smile

44
Q

Levator labii superioris alaeque nasi action

A

Elevates one side of the upper lip towards the nose, dilating the naris (snarling/sneering)

45
Q

Zygomaticus major action

A

Elevates the labial commissure of the upper lip, pulling it laterally when a person smiles

46
Q

Zygomaticus minor action

A

Elevates the upper lip, assisting in smiling

47
Q

Levator anguli oris action

A

Elevates the labial commissure when a person smiles

48
Q

Depressor anguli oris action

A

Depresses the labial commissure when a person frowns

49
Q

Depressor labii inferioris action

A

Depresses the lower lip, exposing the mandibular incisors

50
Q

Mentalis action

A

Raises the chin, wrinkling the skin and protruding the lower lip into a pout

51
Q

Platysma action

A
  • raises the skin of the neck to form noticeable vertical and horizontal ridges and depressions
  • pulls the labial commissure down (grimace of horror or disgust)

Dental Tissues (4 decks)

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