OIAIV Deep Back Muscles

Semispinalis Origin

Transverse processes of lower cervical to mid thoracic spine

Semispinalis Insertion

Occipital bone and spinous process of cervical spine

Semispinalis Capitis Action

extend, sidebend, rotate to same side

Semispinalis Cervicis Action

extend, rotate to opposite side

Semispinalis Innervation

Dorsal rami of cervical spinal nerves

Multifidus Origin

Transverse process of vertebrae, ilium

Multifidus Insertion

Spinous processes 2-4 levels superior

Multifidus Action

Stabilize, extend, rotate spine

Multifidus Innervation

Dorsal rami of spinal nerves

Rotatores Origin

Transverse process of T1-12

Rotatores Insertion

Spinous process of vertebra 1-2 segments superiorly

Rotatores Action

Unilateral: rotates opposite Bilateral: extend spine

Rotatores Innervation

Dorsal rami of spinal nerves

Levatores costarum origin

Transverse process

Levatores costarum insertion

Rib 1-2 segments inferiorly

Levatores costarum action

Stabilize spine

Levatores costarum innervation

Dorsal rami of spinal nerves

Interspinales Origin

Spinous Process

Interspinales insertion

Spinous process of sequential vertebrae

Interspinales Action

Stabilize spine

Interspinales Innervation

Dorsal rami of spinal nerves

Intertransversarii (hypaxial) Origin

Transverse Process

Intertransversarii (hypaxial) insertion

Transverse process of sequential vertebrae

Intertransversarii (hypaxial) action

stabilize spine

Intertransversarii (hypaxial) innervation

Dorsal rami of spinal nerves