Structures

  • Iliocostalis lumborum
  • Iliocostalis thoracis
  • Iliocostalis cervicis
  • Longissimus thoracis
  • Longissimus cervicis
  • Spinalis thoracis
  • Rotatores lumborum
  • Rotatores thoracis
  • Interspinales (not in atlas)
MuscleActionOriginInsertionInnervationBlood supply
Iliocostalis lumborum- Extension of vertebral column
- Assist lateral flexion spine
- Postural stabilisation of spine
- Sacrum
- Spinous processes of T10-L5
- Iliac crest
- Angles of ribs 7-12- Dorsal rami T7-L3- Lumbar arteries
Iliocostalis thoracis- Extension of vertebral column
- Assist lateral flexion spine
- Postural stabilisation of spine
- Angles of ribs 7-12- Angles of ribs 1-6- Dorsal rami T7-L3- Lumbar arteries
Iliocostalis cervicis- Extension of vertebral column
- Assist lateral flexion spine
- Postural stabilisation of spine
- Angles of ribs 3-6- Transverse processes of C4-6- Dorsal rami C4-T6- Occipital artery
Longissimus thoracis- Extension of vertebral column- Blends with iliocostalis in lumbar region
- Transverse processes of L1-5
- Transverse processes of T1-12
- Tubercles of ribs 2-12
-Dorsal rami of T7-L5- Posterior intercostal arteries
Longissimus cervicis- Extension of vertebral column- Transverse processes of T1-5Transverse processes of C2-6- Dorsal rami C4-T4- Posterior intercostal arteries
Spinalis thoracis- Extension of vertebral column- Spinous processes of T10-L2- Spinous processes of T1-7- Dorsal rami T4-L1- Posterior intercostal arteries
Rotatores lumborum- Weak extension lumbar spine
- Proprioception
- Mammillary processes of L1-5- Spinous processes of L1-5- Dorsal rami L2-5- Lumbar arteries
Rotatores thoracis- Weak extension thoracic spine
- Proprioception
- Transverse processes of T1-12- Spinous processes of T1-12- Dorsal rami T1-11- Posterior intercostal arteries
Interspinales- Weak extension of spine
- Proprioception
Short, paired muscles (one each side) attached to the spinous processes of contiguous vertebrae C2-L4(as origin describes)Dorsal rami of C3-L4- Lumbar arteries
- Posterior intercostal arteries
- Occipital artery