DPT 744 Erector Spinae

Iliocostalis proximal attachment (origin)

Arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

Iliocostalis distal attachment

Lumborum, thoracis, cervicis; fibers run superiorly to angles of lower ribs and cervical transverse processes

Iliocostalis action

Bilateral - extend the vertebral column and head; as back is flexed, control movement via eccentric contraction Unilateral - laterally flex vertebral column to the same side

Iliocostalis innervation

Posterior rami of spinal nerves

Longissimus proximal attachment (origin)

Arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

Longissimus distal attachment

Thoracis, cervicis, capitis; fibers run superiorly to ribs between tubercles and angles to transverse processes in thoracic and cervical regions, and to mastoid process of temporal bone

Longissimus action

Bilateral - extend the vertebral column and head; as back is flexed, control movement via eccentric contraction Unilateral - laterally flex vertebral column to the same side

Longissimus innervation

Posterior rami of spinal nerves

Spinalis proximal attachment (origin)

Arises by a broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacroiliac ligaments, sacral and inferior lumbar spinous processes, and supraspinous ligament

Spinalis distal attachment

Thoracis, cervicis, capitis; fibers run superiorly to spinous processes in the upper thoracic region and to cranium

Spinalis action

Bilateral - extend the vertebral column and head; as back is flexed, control movement via eccentric contraction Unilateral - laterally flex vertebral column to the same side

Spinalis innervation

Posterior rami of spinal nerves

Semispinalis proximal attachment (origin)

Transverse processes of C4-T12 vertebrae

Semispinalis distal attachment

Between the superior and inferior nuchal lines on the occipital bone, Spinous processes of C2- T6 vertebrae

Semispinalis action

Extends head, thoracic, and cervical regions of vertebral column, rotates them contralaterally

Semispinalis innervation

Segmentally innervated by dorsal primary rami of spinal nn.

Multifidus proximal attachment (origin)

Aponeurosis of the erector spinae muscles, sacrum and transverse processes of lumbar, thoracic and cervical vertebrae

Multifidus distal attachment

Spinous processes of lumbar, thoracic, and lower cervical vertebrae, spans 2-4 levels

Multifidus action

Extend the vertebral column and rotates the vertebral column contralaterally Multifidus has a lumbar stabilization component

Multifidus innervation

Segmentally innervated by dorsal primary rami of spinal nn.

Rotatores (longus, brevis) proximal attachment (origin)

Transverse processes of C2 vertebra to the sacrum

Rotatores (longus, brevis) distal attachment

Near lamina immediately above vertebra of origin

Rotatores (longus, brevis) action

Extend the vertebral column and rotates the vertebral column contralaterally.

Rotatores (longus, brevis) innervation

Segmentally innervated by dorsal primary rami of spinal nn.

Interspinalis origin

Spinous process above

Interspinalis distal attachment

Spinous process below

Interspinalis action

Stabilization

Interspinalis innervation

Dorsal rami of spinal nn.

Intertransversarii proximal attachment (origin)

Transverse process above

Intertransversarii distal attachment

Transverse process below

Intertransversarii action

Stabilization

Intertransversarii innervation

Dorsal rami of spinal nn.

Levatores costarum proximal attachment (origin)

Transverse process above

Levatores costarum distal attachment

Pass inferolaterally and insert on a rib

Levatores costarum action

Elevate ribs

Levatores costarum innervation

Dorsal rami of C8-T11 spinal nn.