Spinalis
Back
Deep muscle — it lies under other muscles. X-ray makes the muscles over it see-through.
- Origin
- Spinous processes of T11 to L2; in the neck, the nuchal ligament and C7
- Insertion
- Spinous processes of the upper thoracic vertebrae; in the neck, the axis (C2)
- Action
- Extends the spine
- Nerve supply
- Dorsal rami of the spinal nerves
The innermost and thinnest column of the erector spinae, running between the spinous processes right next to the midline. It is closely blended with the longissimus beside it.