Each spinal nerve has two roots, one from the anterior, the other from the posterior portion of the cord.
"A Practical Physiology" by Albert F. Blaisdell
The anterior roots of the spinal nerves were far more numerous than the posterior or dorsal.
"Journal of the Proceedings of the Linnean Society - Vol. 3" by Various
In some mounds, equally aged trees root in the decayed trunks of a still anterior growth.
"History of the United States, Vol. I (of VI)" by E. Benjamin Andrews
The anterior roots arise from a narrow white line upon the anterior columns of the spinal cord.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
The series extends posteriorly some distance behind the anterior root of the zygoma, almost level with the hind edge of the palate.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10" by Various
Thus the tip travels at a higher speed than the root, and the posterior margin than the anterior margin.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
Anteriorly the aortic roots are continued forwards as the dorsal carotid arteries to supply the head region.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
While the rudiments of the posterior roots are still quite short, those of the anterior roots make their first appearance.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour