|Deep muscles of the back. (Spinalis dorsi visible at center. Other spinalis muscles not visible.)|
|Gray's||subject #115 399|
|Artery:||lateral sacral artery|
|Nerve:||posterior branch of spinal nerve|
|Antagonist:||Rectus abdominis muscle|
The Spinalis dorsi, the medial continuation of the Sacrospinalis, is scarcely separable as a distinct muscle.
It is situated at the medial side of the Longissimus dorsi, and is intimately blended with it; it arises by three or four tendons from the spinous processes of the first two lumbar and the last two thoracic vertebrae: these, uniting, form a small muscle which is inserted by separate tendons into the spinous processes of the upper thoracic vertebræ, the number varying from four to eight.
It is intimately united with the Semispinalis dorsi, situated beneath it.
The Spinalis cervicis (Spinalis colli) is an inconstant muscle, which arises from the lower part of the ligamentum nuchæ, the spinous process of the seventh cervical, and sometimes from the spinous processes of the first and second thoracic vertebræ, and is inserted into the spinosus process of the axis, and occasionally into the spinous processes of the two vertebræ below it.
The Spinalis capitis (Biventer cervicis) is usually inseparably connected with the Semispinalis capitis.
- SUNY Figs 01:06-04 - "Intrinsic muscles of the back."
- LUC spin
- spinalis+%28muscle%29 at eMedicine Dictionary
- Dissection at ithaca.edu
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