Ciliospinal reflex
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The ciliospinal reflex (pupillary-skin reflex) consists of dilation of the pupil ipsilateral to a pain stimulus applied to the neck. Therefore, if the right side of the neck is scratched with a sharp pin, the right pupil should dilate. This reflex is absent in Horner's syndrome.
References: http://medical-dictionary.thefreedictionary.com/ciliospinal+reflex
