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Anatomy II > Actions > Flashcards

Actions Flashcards

1
Q

External Intercostals

A
  • support intercostal spaces on inspiration and expiration
  • elevate ribs on inspiration
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2
Q

Internal Intercostal

A
  • prevents pushing out or drawing in of intercostal spaces on inspiration or expiration
  • lowers ribs in forced expiration
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3
Q

Innermost intercostals

A

elevates ribs

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4
Q

transversus thoracis

A

Pulls ribs 2-6 toward sternum on forced exhalation –> depression of those ribs

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5
Q

External abdominal oblique

A

-compresses and supports abdominal viscera
- fixes and rotates trunk contralaterally

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6
Q

Internal abdominal oblique

A
  • comprises and supports abdominal viscera
  • flexes and rotates trunk
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7
Q

Transversus abdominis

A

compresses and supports abdominal viscera

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8
Q

rectus abdominis

A
  • flexes trunk
  • compresses abdominal viscera
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9
Q

quadratus lumborum

A
  • extends and laterally flexes vertebral column
  • flexes 12th rib during inspiration
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10
Q

4 suprahyoid muscles

A

Mylohyoid
Geniohyoid
Stylohyoid
Digastric

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11
Q

Mylohyoid

A
  • Elevates hyoid bone, floor of mouth, and tongue during swallowing and speaking
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12
Q

geniohyoid

A
  • pulls hyoid bone anterosuperiorly
  • shortens floor of mouth
  • widens pharynx
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13
Q

Stylohyoid

A

Elevates and retracts hyoid bone, elongating floor of mouth

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14
Q

Digastric

A
  • Works with infra hyoid muscles
  • depresses mandible against resistance
  • elevates and steadies hyoid bone during swallowing and speaking
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15
Q

4 Infrahyoid muscles

A
  • Sternohyoid
  • Thyrohyoid
  • Sternothyroid
  • Omohyoid
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16
Q

Stenohyoid

A

depresses hyoid bone after elevation during swallowing

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17
Q

Omohyoid

A

Depresses, retracts, and steadies hyoid

18
Q

Sternothyroid

A

Depresses hyoid bone and larynx

19
Q

Thyrohyoid

A

depresses hyoid bone and elevates larynx

20
Q

Platysma

A
  • draws corners of mouth inferiorly and widens it
  • draws skin of neck superiorly when teeth are clenched
21
Q

SCM

A

Unilateral: ipsilateral lat flex and contralat rotation

Bilateral: extend neck @ AO joint; chin tuck; extend superior cervical vertebrae so child is thrust forward with head level

22
Q

Temporalis

A

Elevates mandible closing jaw
- posterior horizontal fibers retract the mandible

23
Q

Masseter

A

elevates mandible
- some contribution to mandibular protrusion

24
Q

Lateral Pterygoid

A

Bilaterally: protracts mandible and depresses chin

Unilaterally: swings jaw toward contralat side; alternate unilateral contraction produces larger chewing movements

25
Q

medial pterygoid

A
  • acts synergistically with masseter to elevate mandible
  • contributes to protrusion
  • alternate unilateral activity produces smaller grinding movements
26
Q

splenius captius and cervicis

A

alone: lat flexes neck and rotates head ipsilateral

together: extend head and neck

27
Q

Bilateral actions of erector spinae mm

A
  • extend vertebral column and head
  • as back is flexed, controls movement by gradually lengthening fibers
28
Q

unilateral actions of erector spinae mm

A

laterally flex vertebral column

29
Q

semispinalis

A
  • extends head, thoracic and cervical regions of vertebral column
  • rotates contra laterally
30
Q

Multifidus

A

unilateral contraction rotates to contralateral side
- stabilizes vertebrae during local movements of vertebral column

31
Q

Rotatores

A
  • may function as organs of proprioception
  • possibly stabilize vertebrae and assist with local extension and rotatory movements of vertebral column
32
Q

Levator costorum

A

elevate ribs, assisting with respiration
- assist with lateral flexion

33
Q

anterior scalene

A
  • elevate 1st rib
  • laterally flex and rotate neck
34
Q

middle scalene

A
  • flex neck laterally
  • elevate first rib
35
Q

Posterior scalene

A
  • flex neck laterally
  • elevate 2nd rib
36
Q

Rectus capitus posterior major

A

Bilat: extension
Unilateral: ipsilateral rotation

37
Q

Rectus captious post min

A

extend head

38
Q

obliquus capitus inferior

A

ipsilateral rotation

39
Q

obliques captifs superior

A

bil: extension
Unilateral: side bend

40
Q

Serratus post sup

A

weekly elevate ribs 2-4

41
Q

serratus post inf

A

weakly depress ribs 8-12

42
Q
A

Anatomy II (8 decks)

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