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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![small group of three cells appears behind the inner part of the postero-lateral nucleus. As this group forms the upper extremity of a column of cells which becomes of importance in the lower half of the segment and in the first dorsal, it may be termed, as in the lumbo-sacral region, the post-postero-lateral group. In the lower part of the eighth segment, the postero-lateral projection is of greater size than at any other part of the cervical region, and forms the large, rounded, outer part of the horn. On examination it is found to be occupied by a large collection of cells arranged in two main groups [separated from each other by a blood-vessel passing obliquely across the outer part of the horn]. Of these the larger and more anterior belongs to the postero-lateral group, and the smaller one behind it (which seems capable of further division into two parts), belongs to the post- postero-lateral column. In the first dorsal segment, which, both on anatomical and physiological grounds, has more affinity with the cervical region than with that from which it obtains its name, the postero-lateral projection still remains prominent, but less so than in the eighth cervical. It has also receded further from the anterior surface, so that it no longer forms the outer Hp of the cup which is characteristic of the anterior cornu in the lower part of the eighth cervical segment. This transition in form is due to the disappearance of the postero-lateral group, which has taken place gradually through the lower part of the eighth segment, and to the development of the post-postero-lateral group. TABLE OF MOTOR CELLS in the various Groups in the Anterior Cornua of Representative Sections from each Segment of the Cervical Region. Anterior Posterior Antero-Lateral. Postero- Post Postero- Phrenic. Spinal Mesial. Mesial. Upper. Lower. Lateral. Lateral. Accessor^'. c. I, 13 8 16 c. 2, 12 8 c. 3, 12 5 c. 4. a, lO 17 c. 4, b, 6 6 4 18 7 c. 5, 15 27 31 c. 6, 9 5 11 7 30 1 c. 7. 4 5 35 16 c 8, a. 4 29 30 3 c 1 8, b, 7 31 21](https://iiif.wellcomecollection.org/image/b21516923_0016.jp2/full/800%2C/0/default.jpg)
