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Deep muscles of the back
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The , 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 vertebræ: 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 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 spinous process of the axis, and occasionally into the spinous processes of the two vertebræ below it.
The (Biventer cervicis) is usually inseparably connected with the
Semispinalis Capitis .
