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