Written by Sharanya Bhaskaran

Last updated January 19, 2023 • 5 Revisions

The interspinales are a set of deep muscles of the back. They are generally considered absent from the thoracic region.

  • Attachments: Originate from the spinous process of cervical and lumbar vertebrae. The fibres ascend and insert onto the spinous processes of the vertebrae above.
  • Actions: Contributes to extension and rotation of the vertebral column. Also stabilises the vertebrae.
  • Innervation: Posterior rami of the spinal nerves.
  • Blood Supply:
    • Cervical region – vertebral, deep cervical, occipital, and transverse cervical arteries .
    • Lumbar region – lumbar arteries.

Fig 1
The lumbar interspinales muscles. The cervical group has a similar arrangement.

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