Experimental researches on the central localization of the sympathethic with a critical review of its anatomy and physiology / by B. Onuf and Joseph Collins.

  • Onuf, Bronislaw.
Date:
[Utica, N.Y.] :
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Licence: In copyright

Credit: Experimental researches on the central localization of the sympathethic with a critical review of its anatomy and physiology / by B. Onuf and Joseph Collins. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    origin of the sensory fibres of the sympathetic system nor of the manner of their connection with the cerebro- spinal system. Kolliker claims that all sensory fibres of the sympathetic originate from cells of the spinal ganglia in exactly the same manner as do the sensory fibres of the cerebro-spinal system. Dogiel, on the other hand, is inclined to assume the existence of specific sympa- thetic fibres derived from cells of sympathetic ganglia or plexuses. (See Text-Figure 4). The two kinds of motor fibres, the cerebro-spinal and the sympathetic, are represented in nearly all subdivisions of the sympathetic system. Both kinds are met with in the rami communicantes, the white rami of which are for the most part composed of cerebro-spinal, the gray ones chiefly of sympathetic fibres (Gaskell). Many efferent rami contain predominantly sympathetic fibres; on the other hand, those efferent rami which proceed from the ganglia of the thoracic part of the sympathetic cord and unite to form the splanchnic nerves are said by Langley to be for the most part cerebro-spinal fibres, showing that they pass through the sympathetic ganglia of the thoracic portion without being interrupted by the cells of the latter. Cerebro-spinal fibres are found also in the more peripheral plexuses, intermingled with sympathetic fibres. A word should be said here regarding inhibitory nerves. These may be of the efferent (analogous to motor nerves) or afferent order (analogous to sensory nerves) inasmuch as they can display their inhibitory influence on a given nerve cell, both in descending (towards the centrifugally terminal cells) and ascending (towards the same cell centripetally) direction. Such inhibitory nerves are of frequent occurrence. Indeed, wherever in the vegetative system one finds nerves performing motor, vasomotor, or