The pupil in extra-ocular disease / by Herbert C. de Cornwell.

  • Cornwell, Herbert C. de.
Date:
[1904]
Catalogue details

Licence: In copyright

Credit: The pupil in extra-ocular disease / by Herbert C. de Cornwell. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    5/18 (page 3)
    locate with fair precision many lesions in various parts of the tract by observing con- comitant muscular involvement. When a lesion exists in the nucleus, ow- ing to its close relationship with other nu- clei, we are apt to get paralysis of func- tions other than those controlled by the third. A normal pupil with paralysis of all the extra-ocular muscles supplied by that nerve, except the internal rectus, would indicate, other things being equal, a nuclear lesion purely, while the same condition including paralysis of the internal rectus and pupil- lary dilatation, point to one of extra-nuclear origin, since, as was noted above, the fibres of the internal rectus are derived from the sixth nucleus of the opposite side. There are several reasons why this the- oretical ease of localization in the centrif- ugal path is rarely possible. In the first place, lesions are not often so limited as to involve the territories at issue without pro- ducing widespread destruction of other centres. In the second place, should the process, whatever its nature, be irritative rather than destructive, we might be mis- led by an increased myosis where a myd- riasis would have been looked for; thirdly, certain toxines may have selective qualities with respect to certain fibres, leading us to