Physiology and pathology of the sympathetic system of nerves / by A. Eulenburg and P. Guttmann ; translated by A. Napier.

Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: Physiology and pathology of the sympathetic system of nerves / by A. Eulenburg and P. Guttmann ; translated by A. Napier. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    the other hand, irritation of the ganglion supremum alone produces always a decrease of the intraocular pressure in cats and rabbits—whilst extirpation of this ganglion is followed by an increase. Hippel and Griinhagen further ascribe to the trigeminus an influence on the intraocular pressure, inas- much as they believe that in it vessel-dilating nerves of the eye are distributed. The influence of the ganglion supremum was also thus far confirmed by Sinitzin,^ that he, after extirpation of this gan- glion, always observed injection of the vessels of the fundus oculi on the side operated on. On ophthalmoscopic examina- tion it was found that the choroidal vessels had increased in volume, their anastomoses were more distinct, and the whole fundus of the eye appeared decidedly redder than on the other side. The temperature of the eye was also raised ; in the conjuctival sac, and under the capsule of Tenon, the dilBFer- ence amounted to 0-9 to 2*4° C. in favour of the eye oper- ated on. 2. Vasomotor Branches of the Brain and of its Membranes. Intracranial Pressure.—The exact relations of the cervical sympathetic to the innervation of the cerebral vessels, and its influence on the intercranial pressure, have not yet been made out with any degree of certainty. Descriptive anatomy teaches that the numerous nerves found in the pia mater, which follow the vessels in a plexi- form arrangement and enter partly with them into the cor- tical substance, rise, at least partially, in the sympathetic plexus vertebralis, while others certainly come from the efferent cranial nerves, especially the trigeminus. That the sympathetic exercises some control over the cranial vessels is thus at least not improbable. Bonders and Callenfelsf noticed contraction of the cranial vessels on irritating the cervical sympathetic. ]S'othnagel,J also,was convinced, through several of his division experiments, that the cervical sympa- thetic, and especially the ganglion supremum, have a share in the innervation of the vessels of the pia mater. Powerful electrical irritation of the nerves of sensation of the skin produced, in rabbits, a reflex contraction of the arteries of the pia mater ; the same occurred also after division of the sym- pathetic between the superior and middle cervical ganglia, and less markedly after extirpation of the superior ganglion, * Centralblattfiirdie Med., Wissench., 1871, No. 11. t Meissner's JahreBbericht, 1856, p. 348. X Virchow's Arcbiv., Bd. 40, p. 203.