. Elements of human physiology. Physiology. THE SPINAL COED 589 motor and sensory nerve-endings. All the other processes of the cell are generally thicker at their origin than the axon, and very rapidly break up into branches which end freely in the neighbouring grey matter. In many cases these dendrites have serrated margins—an appearance espe- cially well-marked in certain cells of the cerebrum and cerebellum. The body of the cell, sometimes called the peri- karyon, is granular and surrounds a large vesicular nucleus with well-marked nuclear membrane, which only stains faintly with nuclear d
. Elements of human physiology. Physiology. THE SPINAL COED 589 motor and sensory nerve-endings. All the other processes of the cell are generally thicker at their origin than the axon, and very rapidly break up into branches which end freely in the neighbouring grey matter. In many cases these dendrites have serrated margins—an appearance espe- cially well-marked in certain cells of the cerebrum and cerebellum. The body of the cell, sometimes called the peri- karyon, is granular and surrounds a large vesicular nucleus with well-marked nuclear membrane, which only stains faintly with nuclear dyes. By special methods a fibrillation Fig. The point of origin of the axon, the ' nerve-hillock,' highly magnified, to show absence of Nissl's granules from the origin of the process. (Held.) of the protoplasm has been demonstrated, the fibrillae sweep- ing across the cell from process to process, and many converg- ing towards the point of origin of the axon (Fig. 269). While some observers regard this fibrillation as an artefact due to the coagulating reagents employed, others attach extreme importance to it, and look upon the fibrillae as the essential conducting elements of the central nervous system, continuous from cell to cell and throughout the whole body. According to most observers however, such an anatomical continuity does not exist, at any rate in vertebrate animals. All the constituents of the central nervous system arise from cell-units, and so far as we can tell, the processes of these. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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