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.
Segmental anhidrosis with hyporeflexia associated with congenital spinal deformity: A Ross's syndrome variant or inverse Horner's syndrome?
Jan 01, 2004; Introduction In 1958, Ross described for the first time a case of tonic pupil and areflexia of the lower extremities (Holmes-Adie...