Trunk Muscles Flashcards Preview

S1 Anatomy > Trunk Muscles > Flashcards

Flashcards in Trunk Muscles Deck (56):
1

Iliocostalis (lumborum, thoracis, cervicis)
-origin

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

2

Iliocostalis (lumborum, thoracis, cervicis)
-insertion

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

3

Iliocostalis (lumborum, thoracis, cervicis)
-actions

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

4

Iliocostalis (lumborum, thoracis, cervicis)
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

5

longissimus (thoracic, cervicis, capitis)
-origin

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

6

longissimus (thoracic, cervicis, capitis)
-insertion

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

7

longissimus (thoracic, cervicis, capitis)
-actions

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

8

longissimus (thoracic, cervicis, capitis)
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

9

Spinalis (thoracic, cervicis)
-origin

common origin
-from spinous processes

10

Spinalis (thoracic, cervicis)
-insertion

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

11

Spinalis (thoracic, cervicis)
-actions

head and vertebral column extension

12

Spinalis (thoracic, cervicis)
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

13

semispinalis (thoracis, cervicis, capitis)
-origin

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

14

semispinalis (thoracis, cervicis, capitis)
-insertion

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

15

semispinalis (thoracis, cervicis, capitis)
-actions

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

16

semispinalis (thoracis, cervicis, capitis)
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

17

multifidus
-origin

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

18

multifidus
-insertion

superomedially 2-4 vertebrae to spinous process

19

multifidus
-action

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

20

multifidus
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

21

rotatores (brevis and longus)
-origin

transverse processes of entire vertebral column

22

rotatores (brevis and longus)
-insertion

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

23

rotatores (brevis and longus)
-actions

-contralaterally rotate superior vertebrae
-bilaterally stabilize superior vertebrae

24

rotatores (brevis and longus)
-innervation

dorsal rami of cervical, thoracic, and lumbar spinal nerves

25

splenius (cervicis, capitis)
-origin

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

26

splenius (cervicis, capitis)
-insertion

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

27

splenius (cervicis, capitis)
-actions

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

28

splenius (cervicis, capitis)
-innervation

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

29

Levator costarum (intertransversarii of thoracic region)
-origin

tip of thoracic transverse process

30

Levator costarum (intertransversarii of thoracic region)
-insertion

inferolaterally to angle of inferior adjacent rib

31

Levator costarum (intertransversarii of thoracic region)
-actions

-elevate ribs during inspiration
-proposed to be involved in lateral flexion

32

Levator costarum (intertransversarii of thoracic region)
-innervation

ventral rami of thoracic spinal nerves

33

quadratus lumborum
-origin

-iliolumbar ligament
-internal lip of iliac crest

34

quadratus lumborum
-insertion

-tips of lumbar transverse processes
-inferior border of rib 12

35

quadratus lumborum
-actions

-vertebral column extension
-vertebral column lateral flexion
-fixes rib 12 during inspiration

36

quadratus lumborum
-innervation

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

37

psoas major
-origin

-transverse process of lumbar vertebrae
-sides of vertebral body of T12, L1-L5
-intervertebral discs

38

psoas major
-insertion

lesser trochanter of femur

39

psoas major
-actions

-increase lumbar lordosis
-assist in vertebral column lateral flexion
-hip flexion
-pelvis flexion on trunk

40

psoas major
-innervation

-lumbar plexis
-branches of primary ventral rami L1-L4

41

rectus abdominis
-origin

pubic crest and symphysis

42

rectus abdominis
-insertion

costal cartilages 5-7
xyphoid process

43

rectus abdominis
-actions

trunk flexion

44

rectus abdominis
-innervation

ventral rami of spinal nerves T5-T12

45

external abdominal oblique
-origin

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

46

external abdominal oblique
-insertion

-outer lip of iliac crest
-linea alba via aponeurosis

47

external abdominal oblique
-actions

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

48

external abdominal oblique
-innervation

ventral rami of spinal nerves T5-T12

49

internal abdominal oblique
-origin

-lateral 2/3 of inguinal ligament
-iliac crest
-thoracolumbar fascia

50

internal abdominal oblique
-insertion

-crest of pubis
-pectineal line
-linea alba

51

internal abdominal oblique
-actions

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

52

internal abdominal oblique
-innervation

ventral rami of spinal nerves T7-T12
iliohypogastric and ilioinguinal nerves

53

transverse abdominis
-origin

-lower 6 ribs
-thoracolumbar fascia (attached to transverse processes of lumbar vertebrae
-iliac crest
-inguinal ligament

54

transverse abdominis
-insertion

-linea alba
-pubic crest

55

transverse abdominis
-actions

-trunk stabilization via fixation of linae alba
-compress abdomen

56

transverse abdominis
-innervation

-ventral rami of spinal nerves T7-T12
-iliohypogastric and ilioinguinal nerves