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. Adobe Stock, Licensed to TeachMeSeries Ltd Fig 1The lumbar interspinales muscles. The cervical group has a similar arrangement. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article