. Cunningham's Text-book of anatomy. Anatomy. 530 THE NEEVOUS SYSTEM. Posterior column gray matter segments of the medulla. Now, we have noted that there is only one cell-column, the ventro-median column, which pursues an almost uninterrupted course throughout the entire length of the medulla. Posterior lateral furrow It may be assumed, therefore, that the nerve-fibres which go to these long trunk-muscles take origin in these medial cells. Edinger states that in the anterior column of gray matter the nuclei of origin of the nerves which supply the proximal mus- cles are medially placed; that t
. Cunningham's Text-book of anatomy. Anatomy. 530 THE NEEVOUS SYSTEM. Posterior column gray matter segments of the medulla. Now, we have noted that there is only one cell-column, the ventro-median column, which pursues an almost uninterrupted course throughout the entire length of the medulla. Posterior lateral furrow It may be assumed, therefore, that the nerve-fibres which go to these long trunk-muscles take origin in these medial cells. Edinger states that in the anterior column of gray matter the nuclei of origin of the nerves which supply the proximal mus- cles are medially placed; that those for the distal muscles are in general situated laterally. If this were the case, the cells connected with the shoulder muscles would lie nearer the middle of the anterior column of gray matter than those which are connected with the hand- muscles. In cases where the forearm and hand, or the leg and the foot, are amputated, it would appear that it is the pos- tero-lateral column of cells that shows changes in consequence of its separation from the muscles to which its fibres are Posterior median septum Nucleus dorsalis Gray commissure Anterior median fissure. Antero-medial group of motor cells Intermedio-lateral column of cells Postero-medial group of motor cells Fig, 469.—Section through the Eighth Thoracic Segment of the Spinal Medulla. (To a large extent founded on Plates in Dr. Bruce's Atlas.) Posterior median septum Posterior lateral furrow Posterior column of matter Intermedio-lateral Cell-column.—The intermedio-lateral cells form a long slender column which extends throughout the entire thoracic region of the medulla in the lateral column of gray matter. It is also pro- longed downwards into the first and second lum- bar segments, where it disappears. In transverse sections through the medulla this cell-group presents a very character- istic appearance, because the cells which compose it are small and are closely packed together. Al- though these ce
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