Structures

  • Iliocostalis lumborum
  • Iliocostalis thoracis
  • Iliocostalis cervicis
  • Longissimus thoracis
  • Longissimus cervicis
  • Longissimus capitis
  • Spinalis thoracis
  • Spinalis cervicis
  • Spinalis capitis

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
Longissimus capitis- Extends the neck
- Rotates head to same side
- Transverse processes of T1-5
- Articular processes C4-7
- Posterior edge of mastoid process-Dorsal rami of C6-T4- Occipital artery
Spinalis thoracis- Extension of vertebral column- Spinous processes of T10-L2- Spinous processes of T1-7- Dorsal rami T4-L1- Posterior intercostal arteries
Spinalis cervicis- Extension of neck-Ligamentum nuchae
- Spinous process of C7
- Spinous process of C2 (axis)- Dorsal rami T4-L1- Posterior intercostal arteries
Spinalis capitis- Extension of neck- Blends with semispinalis capitis- Blends with semispinalis capitis- Dorsal rami C1-3- Occipital artery