Week 2 STRX- intrinsic and deep back muscles

Splenius origin

ligamentum nuchae and C7-T6 spinous processes

Splenius insertion

Mastoid Process, superior nuchal line, capitis, cervicis, posterior tubercles of transverse process of C1-C3

Splenius action

bilateral contraction extends head and neck, unilateral contr laterally flexes neck and head, rotate head ipsilaterally

Splenius innervation

dorsal primary rami of spinal nerves C2-C6

splenius artery supply

occipital and deep cervical

Serratus Posterior Inferior origin

spinous process of T11-L2 vertebra

Serratus Posterior Inferior insertion

inferior borders of ribs 9-12

Serratus Posterior Inferior action

Depresses ribs, proprioception

Serratus Posterior Inferior innervation

anterior primary rami (last 4 intercostal nerves)

serratus posterior inferior artery supply

posterior intercostal

serratus posterior superior origin

nuchal ligament, spinous process of C7-T3 vertebrae

serratus posterior superior insertion

superior borders of ribs 2-5

serratus posterior superior action

elevate ribs, proprioception

serratus posterior superior innervation

anterior primary rami (first 4 intercostal nerves)

serratus posterior superior artery supply

posterior intercostal

Iliocostalis origin

iliac crest, sacrum, spinous processes of lower lumbar vertebrae and sacrum, supraspinous ligament, sacrospinous ligament

Iliocostalis insertion

angles of lower ribs, cervical transverse process

Iliocostalis action

bilateral contr extends back and head, unilateral contr laterally bends trunk and neck

iliocostalis innervation

dorsal primary rami of spinal nerves

iliocostalis artery supply

cervical: occipital, deep cervical, vertebral

thoracic: post intercostal

abdominal: subcostal, lumbar

sacral: lateral sacral

longissimus origin

iliac crest, sacrum, spinous processes of lower lumbar vertebrae and sacrum, supraspinous ligament, sacrospinous ligament

longissimus insertion

mastoid process of temporal bones, transverse process of superior vertebral levels (T and C)

longissimus action

bilateral contr extends back and head, unilateral contr laterally bends trunk and neck

longissimus innervation

dorsal primary rami of spinal nerves

longissimus artery supply

cervical: occipital, deep cervical, vertebral

thoracic: post intercostal

abdominal: subcostal, lumbar

sacral: lateral sacral

spinalis origin

iliac crest, sacrum, spinous processes of lower lumbar vertebrae and sacrum, supraspinous ligament, and sacrospinous ligament

spinalis insertion

spinous process of superior vertebral levels (T and C), and cranium

spinalis action

bilateral contr extends back and head, unilateral contr laterally bends trunk and neck

spinalis innervation

dorsal primary rami of spinal nerves

spinalis artery supply

cervical: occipital, deep cervical, vertebral

thoracic: post intercostal

abdominal: subcostal, lumbar

sacral: lateral sacral

multifundus origin

sacrum, ilium, transverse process of T1-T12, and articular process of C4-7

multifundus insertion

spinous processes 2-4 vertebral lvls superior to their origin

multifundus action

bilateral contr extends the trunk, unilateral contr rotates trunk to opposite side (stabilize spine)

multifundus innervation

dorsal primary rami of spinal nerves

multifundus artery supply

cervical: occipital, deep cervical, and vertebral

thoracic: posterior intercostal, subcostal

lumbar: lateral sacral

rotatores origin

transverse processes

rotatores insertion

longus: spinous process 2 vertebrae above origin

brevis: spinous processes 1 vert above origin

rotatores action

bilateral contr stabilize and extend spine, unilateral contr rotates vertebral column contralaterally

rotatores innervation

dorsal primary rami of spinal nerves

rotatores artery supply

deep cervical, lumbar, and thoracic: post intercostal and subcostal

semispinalis origin

Transverse processes of C4-T12

semispinalis insertion

capitis, back of skill b/w nuchal lines, cervicis and thoracis, spines 4-6 vertebrae above origin

semispinalis action

bilateral contr extends trunk and neck, unilateral contr rotates trunk and head to opposite side

semispinalis innervation

dorsal primary rami of spinal nerves

semispinalis artery supply

cervical: occipital, deep cervical, and vertebral

thoracic: post intercostal, subcostal

lumbar: lumbar

levatores costarum origin

transverse processes of C7-T11

levatores costarum insertion

subadjacent ribs b/w tubercle and angle of ribs

levatores costarum action

elevate ribs, assist with respiration

levatores costarum innervation

dorsal primary rami of spinal nerves

levatores costarum artery supply

posterior intercostal

interspinales origin

superior border of spinous process

interspinales insertion

inferior border of spinous process

interspinales action

extend trunk and neck

interspinales innervation

dorsal primary rami of spinal nerves

interspinalis artery supply

cervical: occipital, deep cervical, and vertebral

thoracic: post intercostal, subcostal

lumbar: lumbar

intertransversarii origin

transverse processes of cervical and lumbar vertebrae

intertransversarii insertion

transverse processes of adjacent vertebrae

intertransversarii action

bilateral contr stabilizes vertebral column, unilateral contr laterally flexes trunk and neck

intertransversarii innervation

cervical ventral and dorsal primary rami, thoracic dorsal primary rami, and lumbar ventral and dorsal primary rami

intertransversarii artery supply

deep cervical, post intercostal thoracic, and lateral lumbar