. A treatise on nervous and mental diseases, for students and practitioners of medicine. e different sensory columns is not yet established, althoughthere has been a vast amount of conjecture upon the subject. Theweight of evidence, however, such as it is, would seem to prove thatthe nerves of touch pass ventrad in the outer part of the posteriorhorn and the adjacent lateral column, whilst the nerves of pain andtemperature are contained in the Gowers columns. Before enteringinto this subject let us consider briefly the gray matter of the spinalcord. This is disposed, as represented in Fig. 37,
. A treatise on nervous and mental diseases, for students and practitioners of medicine. e different sensory columns is not yet established, althoughthere has been a vast amount of conjecture upon the subject. Theweight of evidence, however, such as it is, would seem to prove thatthe nerves of touch pass ventrad in the outer part of the posteriorhorn and the adjacent lateral column, whilst the nerves of pain andtemperature are contained in the Gowers columns. Before enteringinto this subject let us consider briefly the gray matter of the spinalcord. This is disposed, as represented in Fig. 37, in the form ofhorns. The anterior or motor horns or cornua are ventrad, and ANATOMY. 59 end anteriorly in a blunt-shaped process, and the posteriorThorns orcornua are dorsad, and come up to the periphery. The anterior motor horns have a different shape at different levelsof the cord, and these are outlined in Figs. 39 and 40. In these anteriorhorns are grouped certain large cells, known as ganglion cells, theshape of some of which is represented in Fig. 41. In all of these. Fig. Drawing of cell-groupings in the anterior cornua of the human spinal cord ; lumbarenlargement on the right, cervical cord on the left. which I have obtained by the tapping process, most of the processespassing away from the body of the cell, as will be observed, are largeand have a tendency to branch. But in some there is a processwhich rapidly diminishes in size as it goes from the cell and doesnot branch; and these, judging not only from the shape, but alsobecause of the connections and appearance under the microscope, arejjrobably axis-cylinder processes, making direct connection with theaxis-cylinder of the nerve which has been spoken of on pages 17 and18. In Fig. 42 is seen a drawing from a photo-micrograph, madefor me by Dr. Henry McDonald, of these same anterior horn cellsas observed under the microscope, magnified 360 times. It gives aclear idea of the way in which they lie in the meshes o
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