Muscles that MOVE the spine

Question 1

Erector Spinae (Iliocostalis)

Answer 1

ORIGIN

Common lumbar tendon and posterior surface of ribs.

INSERTION

Posterior surface of ribs and transverse processes of some lumbar and lower cervical vertebrae.

ACTION

Bilaterally: Extention of the vertebral column. Unilaterally: Lateral flexion of the vertebral column to the same side.

INNERVATION

Spinal.

Question 2

Erector Spinae (Longissimus)

Answer 2

ORIGIN

Transverse processes of lumbar and thoracic vertebrae.

INSERTION

Transverse processes, ribs, and mastoid process of temporal bone.

ACTION

Bilaterally: Extention of the vertebral column. Unilaterally: Lateral flexion of the vertebral column to the same side.

INNERVATION

Spinal.

Question 3

Erector Spinae (Spinalis)

Answer 3

ORIGIN

Spinous processes of cervical and thoracic vertebrae.

INSERTION

Spinous processes of cervical and thoracic vertebrae.

ACTION

Bilaterally: Extention of the vertebral column. Unilaterally: Lateral flexion of the vertebral column to the same side.

INNERVATION

Spinal.

Question 4

Multifidus

Answer 4

ORIGIN

Sacrum, PSIS, and transverse processes lumbar, thoracic, and cervical vertebrae.

INSERTION

Spinous processes of bones 2-4 above origin.

ACTION

Extension, lateral flexion, and rotation of the spine.

INNERVATION

Spinal.

Question 5

Rotatores

Answer 5

ORIGIN

Transverse process of each vertebrae.

INSERTION

Lamina of the vertebra above the origin.

ACTION

Rotates the vertebral column to the opposite side and postural control.

INNERVATION

Spinal.

Question 6

Quadratus Lumborum

Answer 6

ORIGIN

Posterior border of iliac crest.

INSERTION

12th rib, transverse processes of lumbar vertebrae.

ACTION

Lateral flexion of vertebral column, hip elevation, extension of vertebral column, and fixes last rib during expiration.

INNERVATION

Lumbar plexus.