Lumbar Spine Musculature

Clinical Anatomy - ATTH 5P01

interspinales

O: inferior spinous processes

I: superior spinous processes

A: extension, posture

N: spinal nerves

intertransversarii

O: inferior transverse processes

I: superior transverse processes

A: spine stabilization, lateral flexion

N: spinal nerves

rotatores

O: inferior transverse processes

I: superior spinous processes

A: extension, contralateral rotation

N: spinal nerves

multifidus

O: inferior transverse processes/sacrum

I: superior spinous processes

A: extension, rotation, lateral flexion

N: spinal nerves

semispinalis cervicis

O: transverse processes T1-T5/6

I: spinous processes C2-C5

A: extension, rotation, lateral flexion

N: cervical spinal nerves

semispinalis thoracis

O: transverse processes T6-T10

I: spinous processes C6-T4

A: extension, rotation, lateral flexion

N: thoracic spinal nerves

semispinalis capitus

O: transverse processes

I: occipital bone

A: neck extension, neck rotation, lateral flexion

N: cervical spinal nerves

spinalis thoracis

O: spinous processes T11-L2

I: spinous processes of superior thoracic vertebrae

A: extension

N: thoracic/lumbar spinal nerves

spinalis cervicis

O: nuchal ligament, spinous process C7

I: spinous processes C1, C3, C4

A: neck extension

N: cervical spinal nerves

longissimus capitis

O: cervical/thoracic transverse processes

I: mastoid process

A: neck extension, lateral neck flexion, rotation

N: cervical/thoracic spinal nerves

longissimus cervicis

O: superior thoracic transverse processes

I: middle/superior cervical transverse processes

A: extension, lateral flexion

N: cervical/thoracic spinal nerves

longissimus thoracis

O: thoracic/lumbar transverse processes

I: thoracic/lumbar transverse processes, superior ribs

A: extension, lateral flexion

N: thoracic/lumbar spinal nerves

iliocostalis cervicis

O: ribs

I: transverse processes C4-6

A: lateral neck flexion, rib elevation

N: cervical/thoracic spinal nerves

iliocostalis thoracis

O: ribs 6-12

I: superior ribs, transverse process C7

A: vertebral stabilization

N: thoracic spinal nerves

quadratus lumborum

O: iliolumbar ligament, iliac crest

I: transverse processes L1-4, inferior border of last rib

A: rib depression, lateral flexion

N: lumbar plexus

iliocostalis lumborum

O: lumbar spinous processes/sacrum

I: ribs 6-12

A: extension, rib depression

N: thoracic/lumbar spinal nerves