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S1 Anatomy > Trunk Muscles > Flashcards

Trunk Muscles Flashcards

1
Q

Iliocostalis (lumborum, thoracis, cervicis)

-origin

A

common origin
-broad tendon from posterior iliac crest, sacrum, SI ligaments, spinous processes of sacral and inferior lumbar vertebrae

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2
Q

Iliocostalis (lumborum, thoracis, cervicis)

-insertion

A 
I. lumborum
-inferior border of angle of ribs 12-6
I. thoracis
-all ribs
I. cervicis
-ribs 6-1
-posterior tubercles of C4-C6
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3
Q

Iliocostalis (lumborum, thoracis, cervicis)

-actions

A

laterally flex head and vertebral column to same side (ipsilaterally)
bilateral head and trunk extension

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4
Q

Iliocostalis (lumborum, thoracis, cervicis)

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

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5
Q

longissimus (thoracic, cervicis, capitis)

-origin

A

common origin

  • cervicis and capitis have origins on the transverse processes at lower levels
  • this seems like a strange description of the origin; will try and figure out from book
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6
Q

longissimus (thoracic, cervicis, capitis)

-insertion

A

L. thoracis
-tips of transverse processes T1-T12
-tubercles of inferior border of ribs 9 and 10
L. cervicis
-superior thoracic transverse processes to cervical transverse processes
L capitis
-arises with L. cervicis and attaches to mastoid process

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7
Q

longissimus (thoracic, cervicis, capitis)

-actions

A

ipsilateral lateral flexion of head and vertebral column
bilateral head and trunk extension
L.capitis
-rotates head to same side

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8
Q

longissimus (thoracic, cervicis, capitis)

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

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9
Q

Spinalis (thoracic, cervicis)

-origin

A

common origin

-from spinous processes

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10
Q

Spinalis (thoracic, cervicis)

-insertion

A

S. thoracic
-tips of spinous processes of thoracic vertebrae
S. cervicis
-ligamentum nuchae to axis (C2)
*these are inconsistent attachments according to the notes

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11
Q

Spinalis (thoracic, cervicis)

-actions

A

head and vertebral column extension

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12
Q

Spinalis (thoracic, cervicis)

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

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13
Q

semispinalis (thoracis, cervicis, capitis)

-origin

A

S. thoracis
-transverse processes superomedially T6-T10
S. cervicis
-transverse processes superomedially T1-T6
S. capitis
-transverse processes T1-T6 (C7 articular process)

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14
Q

semispinalis (thoracis, cervicis, capitis)

-insertion

A 
S. thoracis
-spinous processes C6-T4
S. cervicis
-Spinous processes C2-C5
S. Capitis
-Inferior to superior nuchal line
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15
Q

semispinalis (thoracis, cervicis, capitis)

-actions

A 
all
-contralateral trunk/head rotation
S. thoracis and cervicis
-vertebral column extension
S. capitis
-head extensor when active bilaterally
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16
Q

semispinalis (thoracis, cervicis, capitis)

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

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17
Q

multifidus

-origin

A

laminae (mamillary process) of S4-C2, including zygapophysial capsule
may be absent in thoracic region

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18
Q

multifidus

-insertion

A

superomedially 2-4 vertebrae to spinous process

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19
Q

multifidus

-action

A 
unilaterally
-lateral flexion of vertebral column
-contralateral transverse rotation
bilaterally
-trunk extension
vertebral column stabilization
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20
Q

multifidus

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

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21
Q

rotatores (brevis and longus)

-origin

A

transverse processes of entire vertebral column

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22
Q

rotatores (brevis and longus)

-insertion

A

superomedially to spinous processes of next (brevis) or 2nd SP (longus)

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23
Q

rotatores (brevis and longus)

-actions

A
  • contralaterally rotate superior vertebrae

- bilaterally stabilize superior vertebrae

24
Q

rotatores (brevis and longus)

-innervation

A

dorsal rami of cervical, thoracic, and lumbar spinal nerves

25
Q

splenius (cervicis, capitis)

-origin

A 
S. cervicis
-spinous processes of T3-T6
S. capitis
-spinous processes of C7-T4
-ligamentum nuchae
26
Q

splenius (cervicis, capitis)

-insertion

A 
S. cervicis
-transverse processes of C2-C5
S. capitis
-lateral part of superior nuchal line
-mastoid process
27
Q

splenius (cervicis, capitis)

-actions

A

bilateral contraction
-extension of cervical region
unilateral contraction
-ipsilateral lateral flexion and rotation

28
Q

splenius (cervicis, capitis)

-innervation

A

S. cervicis
-dorsal rami of spinal nerves C4-C8
S. capitis
-dorsal rami of spinal nerves C3-C5

29
Q 
Levator costarum (intertransversarii of thoracic region)
-origin
A

tip of thoracic transverse process

30
Q 
Levator costarum (intertransversarii of thoracic region)
-insertion
A

inferolaterally to angle of inferior adjacent rib

31
Q 
Levator costarum (intertransversarii of thoracic region)
-actions
A
  • elevate ribs during inspiration

- proposed to be involved in lateral flexion

32
Q 
Levator costarum (intertransversarii of thoracic region)
-innervation
A

ventral rami of thoracic spinal nerves

33
Q

quadratus lumborum

-origin

A
  • iliolumbar ligament

- internal lip of iliac crest

34
Q

quadratus lumborum

-insertion

A
  • tips of lumbar transverse processes

- inferior border of rib 12

35
Q

quadratus lumborum

-actions

A
  • vertebral column extension
  • vertebral column lateral flexion
  • fixes rib 12 during inspiration
36
Q

quadratus lumborum

-innervation

A

branches of ventral rami of T12, L1-3(4)

37
Q

psoas major

-origin

A
  • transverse process of lumbar vertebrae
  • sides of vertebral body of T12, L1-L5
  • intervertebral discs
38
Q

psoas major

-insertion

A

lesser trochanter of femur

39
Q

psoas major

-actions

A
  • increase lumbar lordosis
  • assist in vertebral column lateral flexion
  • hip flexion
  • pelvis flexion on trunk
40
Q

psoas major

-innervation

A
  • lumbar plexis

- branches of primary ventral rami L1-L4

41
Q

rectus abdominis

-origin

A

pubic crest and symphysis

42
Q

rectus abdominis

-insertion

A

costal cartilages 5-7

xyphoid process

43
Q

rectus abdominis

-actions

A

trunk flexion

44
Q

rectus abdominis

-innervation

A

ventral rami of spinal nerves T5-T12

45
Q

external abdominal oblique

-origin

A

anterior fibers
-external surface of ribs 5-8
lateral fibers
-external surface of ribs 9-12

46
Q

external abdominal oblique

-insertion

A
  • outer lip of iliac crest

- linea alba via aponeurosis

47
Q

external abdominal oblique

-actions

A 
bilaterally
-trunk flexion
-lateral fibers act on lumbar region to tilt pelvis posteriorly
unilaterally
-contralateral transverse rotation
compress abdomen
48
Q

external abdominal oblique

-innervation

A

ventral rami of spinal nerves T5-T12

49
Q

internal abdominal oblique

-origin

A
  • lateral 2/3 of inguinal ligament
  • iliac crest
  • thoracolumbar fascia
50
Q

internal abdominal oblique

-insertion

A
  • crest of pubis
  • pectineal line
  • linea alba
51
Q

internal abdominal oblique

-actions

A

upper anterior fibers
-trunk flexion
unilaterally
-work with contralateral external obliques to rotate trunk (for the internal obliques this is ipsilateral transverse rotation)

52
Q

internal abdominal oblique

-innervation

A

ventral rami of spinal nerves T7-T12

iliohypogastric and ilioinguinal nerves

53
Q

transverse abdominis

-origin

A
  • lower 6 ribs
  • thoracolumbar fascia (attached to transverse processes of lumbar vertebrae
  • iliac crest
  • inguinal ligament
54
Q

transverse abdominis

-insertion

A
  • linea alba

- pubic crest

55
Q

transverse abdominis

-actions

A
  • trunk stabilization via fixation of linae alba

- compress abdomen

56
Q

transverse abdominis

-innervation

A
  • ventral rami of spinal nerves T7-T12

- iliohypogastric and ilioinguinal nerves

S1 Anatomy (31 decks)

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