Licence: In copyright
Credit: A topographical atlas of the spinal cord. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![the second sacral segment. In the lower half of this segment it increases rapidly, so that its cells are about four times as numerous as at the higher levels, and occupy the postero-lateral angle of the horn. [As already explained, at this level they are apt to be confused with the postero-lateral group, an error to be avoided by realising and remembering that the postero-lateral group has passed forwards almost into the position previously occupied by the antero-lateral group.] This post-postero-lateral column rapidly diminishes through the third segment, where it w^ill be noted, however, that its numbers preponderate over those of the postero-lateral group. The column entirely ceases at the lower limit of the third sacral segment. The ce7itral cell column, which appears to have no homologue in the cervical region, extends from the second lumbar to the upper part of the second sacral segment. Throughout its entire course it forms a fairly compact column of cells, to the inner side of, and between, the antero-lateral and postero-lateral group of cells. The number of the cells is at its maximum at the fifth lumbar, and first sacral segments, the increase from the apex being gradual, the diminution to its lower limit being rapid. It ceases entirely at the upper part of the second sacral segment. TABLE OF MOTOR CELLS in the various Groups in the Anterior Cornua of Representative Sections from each Segment of the Lumbo-Sacral Region. Anterior Mesial. Posterior Mesial. Anterior. Antero- Lateral. Postero- Luteral. Post Postero- Lateral. Central. L. I, 5 3 3 L. 2, 7 4 ID 26 3 L. 3. 5 4 8 35 12 L. 4, 6 4 24 50 11 L. 5, 22 50 18 S. I, 33 34 7 20 S. 2, a, 20 31 6 11 S. 2, b, I 9 22 25 S. 3. a, 5 7 22 S. 3, b. 3 + 5 6 10 S. 4, lO S. 5, ■](https://iiif.wellcomecollection.org/image/b21516923_0019.jp2/full/800%2C/0/default.jpg)
