Ciliospinal reflex

The ciliospinal reflex (pupillary-skin reflex) consists of dilation of the bilateral pupil to a pain stimulus applied to the neck, face, and upper trunk. Therefore, if the right side of the neck is scratched with a sharp pin, the bilateral pupil should dilate(1-2mm from baseline). This reflex is absent in Horner's syndrome and lesions involving the cervical sympathetic fibers.


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