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Ciliospinal reflex



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

http://cancerweb.ncl.ac.uk/cgi-bin/omd?ciliospinal+reflex

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ciliospinal_reflex". A list of authors is available in Wikipedia.
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