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Arteriae spinales, are two in number, viz: I. The posterior spinal, Artere mediane posterieure du Rachis, (Ch.) It arises from the vertebral, near the corpora pyramidalia, and descends on the posterior surface of the spinal marrow, distributing its ramifications to it. 2. The anterior spinal artery, A. mediane anterieure, (Ch.,) is larger than the last, and arises, also, from the vertebral. It descends, in a serpentine manner, upon the anterior surface of the marrow; furnishes ramusculi to it, and unites with that of the opposite side, opposite the foramen magnum occipitis. A very tortuous branch arises from this union, which descends as far as the inferior extremity of the marrow, to which it sends numerous divisions. The term Spinal Arteries or Rachidian Arteries is also given, in the abstract, to all the arteries of the spinal marrow and vertebral canal. The same may be said of the veins and nerves.