Carpenter's principles of human physiology . s, a translation of hispaper entitled Die Ergebnisse neuerer Untersuchung, &c, in Fosters Journal of Physio-logy, vol. i. 1878, p. 196. STRUCTURE OF THE SPINAL CORD. 565 mence with the Cranio-Spinal Axis; which, as already pointed out, may beconsidered as constituting the fundamental portion of this apparatus. Theentire Axis is divided into its Cranial and its Spinal portions, the passage ofthe Cord through the foramen magnum of the occipital bone being con-sidered to mark the boundary between them; and although the separation ofthe Medulla Spinalis
Carpenter's principles of human physiology . s, a translation of hispaper entitled Die Ergebnisse neuerer Untersuchung, &c, in Fosters Journal of Physio-logy, vol. i. 1878, p. 196. STRUCTURE OF THE SPINAL CORD. 565 mence with the Cranio-Spinal Axis; which, as already pointed out, may beconsidered as constituting the fundamental portion of this apparatus. Theentire Axis is divided into its Cranial and its Spinal portions, the passage ofthe Cord through the foramen magnum of the occipital bone being con-sidered to mark the boundary between them; and although the separation ofthe Medulla Spinalis from the Medulla Oblongata, which is thus established, isin itself purely artificial, yet it will be found to correspond completely withthe natural division founded on their respective physiological attributes. 438. The Spinal Cord* which extends from the margin of the foramenmagnum to the first or second lumbar vertebra, and which is prolonged asthe filum terminal e\ to the extremity of the sacral canal, is almost completely Fig. Transverse section of Spinal Cord, through the middle of the lumhar enlargement, showingon the right side the course of the nerve-roots, and on the left the position of the principaltracts of vesicular matter:—a, a, anterior columns; p, p, posterior columns; l, l, lateralcolumns; a, anterior median fissure; p, posterior median fissure; b, b, b, b, anterior roots ofspinal nerves ; c, c, posterior roots; d, d, tracts of vesicular matter in anterior column; e,tracts of vesicular matter in posterior column, termed by Jaeubowitsch the sympatheticcolumn or tract; f, central canal, surrounded by the grey commissure; g, substantia gela-tinosa of Rolando. divided by the anterior and posterior median fissures (Fig. 207, a,p), into twolateral and symmetrical halves. The anterior median fissure (a) is moredistinct than the posterior, being wider at the surface; but it only penetratesto about one-third of the thickness of the Cord, its depth increasing, h
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