. Vegetative neurology; the anatomy, physiology, pharmaco-dynamics and pathology of the sympathetic and autonomic nervous systems . ise from groupsof cells which come in from the midbrain and vagus ganglia. Onemay justly conclude that the excitatory neurones arise in cells whichhave wandered from the motor roots, while the sensory neurones arederived from the posterior roots. There exists, consequently, abroad analogy between the sympathetic system and the central nerv-ous system. The sympathetic system is but the part of the centralsystem which has functions corresponding to its part. Accordi
. Vegetative neurology; the anatomy, physiology, pharmaco-dynamics and pathology of the sympathetic and autonomic nervous systems . ise from groupsof cells which come in from the midbrain and vagus ganglia. Onemay justly conclude that the excitatory neurones arise in cells whichhave wandered from the motor roots, while the sensory neurones arederived from the posterior roots. There exists, consequently, abroad analogy between the sympathetic system and the central nerv-ous system. The sympathetic system is but the part of the centralsystem which has functions corresponding to its part. According to Froriep, the movement of cells to their later placesis neither a free wandering [His Keimcells] or a pure mitotic split-ting [Kohns theory of syncytiate or neurocytial construction of the 13 14 VEGETATIVE NEUROLOGY sympathetic cord] but a combination of both processes, dependentupon the established paths of the outgrowing neuroblastic ramifica-tions. These latter come exclusively from the central organs where thecorresponding neuroblasts occupy the dorso-lateral zone of the spinaland bulbar anterior horn region. Plate:2. Section through Embryo of Selachien showing Sensori-motor and Vegetative Arcs. (Froriep.) CHAPTER IVHistology of the Sympathetic Cord and Cranial Ganglia Histologically the vegetative system is characterized by severalpeculiarities which may be of diagnostic value in differentiating itfrom other parts of the nervous system. The vegetative differsboth microscopically and macroscopically from other parts of thenervous system. The ganglia have a connective tissue sheath andits nerve fibers are sheathless, gray axis cylinders. Their color isdue to the absence of the very refractible, whitish myelin. The vegetative ganglia are very hard to demonstrate in manboth microscopically and macroscopically. This is due most probablyto the fact that the ganglionic nodes lie very close to tissues whichare readily fermented and destroyed after death, such as the nasalmuco
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