Intrinsic Back Muscles Action, Orgin, Insertion, Innervations

Splenii: Splenius capitis & cervicis purposeful activity

Social interaction, driving

Splenii: Splenius capitis & cervicis orgin

Nuchal ligament and spinous processes of lower cervical and upper thoracic vertebra

Splenii: Splenius capitis & cervicis insertion

Superior nuchal line, mastoid process, Transverse processes of upper cervical vertebrae

Splenii: Splenius capitis & cervicis primary actions

Unilaterally: Laterally flex the head & neck, ipsilateral (same side) rotation Bilaterally: Extend head and neck

erector spinae group purposeful activity

Maintaining an upright position for ADLs/IADLs

erector spinae group orgin

Common tendon (thoracolumbar fascia) that attaches to the posterior surface of sacrum, iliac crest, and spinous processes of

the lumbar and lower thoracic vertebrae

erector spinae group insertion

Primarily ribs & transverse processes

erector spinae group primary action

Unilaterally: Laterally flex

Bilaterally: Extend

Transversospinales Group: Semispinalis purposeful activity

Using a computer workstation, looking overhead

Transversospinales Group: Semispinalis orgin

Transverse processes of thoracic & cervical regions

Transversospinales Group: Semispinalis insertion

Between superior & inferior nuchal lines

Transversospinales Group: Semispinalis primary action

Unilaterally: contralateral (opposite side) rotation Bilaterally: Extension

Transversospinales Group: Multifidus & Rotatores purposeful activity

Tai chi or yoga (deep postural stability)

Transversospinales Group: Multifidus & Rotatores orgin

Sacrum, PSIS, mammillary processes of lumbar vertebrae & transverse processes of thoracic & cervical vertebrae

Transversospinales Group: Multifidus & Rotatores insertion

spinous processes

Transversospinales Group: Multifidus & Rotatores primary actions

Stabilize, extend, contralateral rotation of vertebra

segmental group: interspinales orgin

spinous processes

segmental group: interspinales insertion

spinous processes

segmental group: interspinales primary actions

stabilize

Segmental group: Intertransversarii orgin

transverse process

Segmental group: Intertransversarii insertion

transverse process

Segmental group: Intertransversarii primary action

stabilize

suboccipital group purposeful activity

Scanning a computer monitor, reading a book

suboccipital group orgin

Posterior tubercle C1; Spinous process C2

suboccipital group insertion

Inferior nuchal line & C1

suboccipital group primary action

Extension of head, ipsilateral rotation, lateral flexion of head