On dilatation of the pupil from stimulation of the cortex cerebri / by J. Herbert Parsons.

  • Parsons, John Herbert, Sir, 1868-1957.
Date:
1901
Catalogue details

Licence: In copyright

Credit: On dilatation of the pupil from stimulation of the cortex cerebri / by J. Herbert Parsons. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    APPENDIX. The following are abstracts of some of the experiments. Exp. X. Cat. A.C.E. Both sympathetica prepared. L. frontal lobes exposed and continued back over occipital lobes. A. M. 11.15 Stimulate mesial surface near crucial sulcus=dilatation of both pupils with retraction of nictitating membranes, esp. marked on It. side. No move- ments of body. Stimulate post-supra-sylvian convolution=same eS'ect but more marked. Other parts of exposed area stimulated with negative results. 11.40 Stimulate mesial surf, near crucial=usual result with contraction of orbi- culares palpebrarum, esp. opp. side. 11.42 Stimulate post-supra-sylvian convolution = usual effect, no body movements. Repeated several times at intervals. 12.0 Cut L. symp. Stimulate oral end = wide dilatation. Stimulate sigmoid gyrus=dilatation of both, R. >L. Stimulate post-supra-sylvian=ditto, but less marked. ******* P.M. 12.45 L. cortex removed. Stimulate R. cut surface of corpus callosum = move- ments of L. side of body and dilatation of both pupils, R. > L. 12.50 L. Ill cut, pupil dilates to f. Stimulate corpus callosum = R. dilates, L. immobile. 1.0 R. symp. cut... Stimulate corpus callosum = very slight dilatation. 1.10 R. pupil<|: stimulate mesial surface of R. hemisphere=slight dilatation of R. pupil. Exp. XII. Cat. A.C.E. Sympathetics prepared. L. cortex exposed. P.M. 12.0 Stimulate sigmoid = marked dilatation, rapid recoil. 12.5 Stimulate post-supra-sylvian=ditto, more marked. Cut L. symp. 12.10 Pupils R. = ^, L. <£. 12.13 Stimulate sigmoid, R. >|, L. >£, longer latent period, eyes down and to R. 12.17 Corpus callosum divided. R.=J, L. <£. 12.20 Stimulate sigmoid = R. L. nearly 12.22 Stimulate post-supra-sylvian = ditto, eyes straight. Repeated several times. 12.30 Cut R. symp. 12.33 Both = |: stimulate sigmoid, both = : repeat = ditto. Stimulate 2nd ext. (post, pi.) = ditto. 12.40 Stimulate central end of cut L. sciatic n. = marked dilatation of both (f). 12.50 Cut L. III. R. >1, L. >|. Stimulate sigmoid = R. = |, L. nil. [The corpus callosum was completely divided except at splenium.] Exp. XIV. See Brit. Med. Jl, Sep. 15, 1900. Exp. XVI. Cat. Ether. Both sympathetics prepared. L. cortex exposed. A.M. 11.45 Lateral nystagmus, -56 per minute. Stimulate sigmoid = nil—deep anaes- thesia. Pupils equal, .