KNH 244 lab quiz 8

right external oblique and left internal oblique

*what 2 muscles would rotate the trunk to the left?

left external oblique and right internal oblique

*what 2 muscles would rotate the trunk to the right?

quadratus lumborum

*what muscle posteriorly tilts the pelvis and is on the inguinal and originates on iliac crest?

spinalis

*Which muscle is most medial to erector spinae group?

pubic symphisis

*origin of the rectus abdominis

intercostal nerves

*innervation of the external and internal abdominal obliques

contralaterally rotate trunk and neck

*function of transversospinalis but not erector spinae

semispinalis

*which muscle of the layer 6 muscles contains the thoracis and capitus muscles (and cervicis)?

5

*layer ___

-iliocostalis lumborum
-iliocostalis thoracis
-iliocostalis cervicis
-longissimus thoracis
-longissimus cervicis
-longissimus capitis
-spinalis thoracis
-spinalis cervicis

6

*layer ____

-semispinalis thoracis
-semispinalis cervicis
-semispinalis capitis
-multifidius
-rotatores

anterior iliac crest, pubic bone, abdominal aponeurosis

origins of external abdominal oblique (3)

ribs 5-12

insertion of external abdominal oblique

flexion, lateral flexion, contralateral rotation, posterior tilt

function of external abdominal oblique

inguinal ligament, iliac crest, thoracolumbar fascia

origins of internal abdominal oblique (3)

ribs 10-12, abdominal aponeurosis

insertions of internal abdominal oblique (2)

flexion, lateral flexion, ipsilateral rotation, posterior tilt

functions of internal abdominal oblique (4)

inguinal ligament, iliac crest, throacolumbar fascia, cartilages of ribs 7-10

origins of transversus abdominis (4)

abdominal aponeurosis

insertion of transversus abdominis

compresses abdominopelvic cavity

function of transversus abdominis

xiphoid process, cartilage of ribs 5-7

insertions of rectus abdominus (2)

flexion, posterior tilt

functions of rectus abdominis (2)

intercostal nerve

innervation of transversus abdominus and rectus abdominis

layer 5

largest group of back muscles; longitudinal muscles that run length of spine filling a groove lateral to SP’s; from lateral-medial, 3 muscle groups (ILS); covered by thoracolumbar fascia; each group has 2-3 subdivisions named according to which area of spine they insert

erector spinae group

group: consists of spinalis, longissimus, and iliocostalis

3 regions of iliocostalis

lumborum, thoracis, cervicis

thoracis, cervicis

regions of spinalis

spinous processes T11-L2

origins of spinalis thoracis (2)

spinous process T11-L2

origin of spinalis thoracis

sacrum, iliac crest

origins of iliocostalis lumborum (2)

ribs 7-12

origin of iliocostalis thoracis

ribs 3-6

origin of iliocostalis cervicis

ribs 7-12

insertion of iliocostalis lumborum

ribs 1-6, transverse process of C7

insertions of iliocostalis thoracis (2)

transverse processes of C4-C6

insertion of iliocostalis cervicis

extension, lateral flexion

functions of iliocostalis (2)

dorsal rami of spinal nerves

innervation of iliocostalis

sacrum, iliac crest, transverse processes L1-L5

origins of lomgissimus thoracis (3)

transverse processes T1-T5

origin of longissimus cervicis

articular processes C5-C7

origin of longissimus capitis

ribs 4-12, transverse processes T1-T12

insertions of longissimus thoracis (2)

transverse processes C2-C6

insertion of longissimus cervicis

mastoid process

insertion of longissimus captitis

extension, lateral flexion

functions of longissimus (2)

dorsal rami of spinal nerves

innervation of longissimus

inferior nuchal ligament, C7 spinous process

origin of spinalis cervicis

spinous processes T3-T8

insertion of spinalis thoracis

C2 spinous process

insertion of spinalis cervicis

extension and lateral flexion

functions of spinalis (2)

dorsal rami of spinal nerves

innervation of spinalis

thoracis, cervicis, capitus

3 regions of semispinalis

transverse processes T6-T12

origin of semispinalis thoracis

transverse processes T1-T6

origin of semispinalis cervicis

semispinalis, multifidus, rotatores

3 muscles of transversospinalis group

transverse processes C7-T6, articular processes C4-C6

origins of semispinalis captitus

spinous processes C60C7, T1-T4

insertions of semispinalis thoracis (2)

spinous processes C2-C5

insertions of semispinalis cervicis

occipital bone

insertion of semispinalis capitus

extension, lateral flexion, contralateral rotation

functions of semispinalis (3)

dorsal rami of spinal nerves

innervation of semispinalis

posterior sacrum, PSIS, L5-C4 vertebrae

origins of multifidius (3)

spinous processes 3-4 levels above origin

insertion of semispinalis

extension, lateral flexion, contralateral rotation

functions of multifidius (3)

dorsal rami of spinal nerves

innervation of multifidus

transverse process

origin of rotatores

laminia 1-2 levels superior to origin

insertion of rotatores

contralateral rotation, extension

functions of rotatores (2)

dorsal rami of spinal nerves

innervation of rotatores