• Neuroscience letters · Jan 1999

    Cutaneous afferents producing a reflex pupil dilation in anesthetized rats.

    • M Shimura, H Ohsawa, S Yamaguchi, and Y Sato.
    • Laboratory of Physiology, Tsukuba College of Technology, Japan.
    • Neurosci. Lett. 1999 Jan 4; 259 (1): 17-20.

    AbstractCutaneous afferents producing a reflex pupil dilation were examined using natural mechanical stimulation of the hindlimb skin and electrical stimulation of a sural nerve in anesthetized, artificially ventilated rats. Pupil diameter was continuously recorded after magnification using a microscope connected to a charge coupled device camera. Innocuous brushing, or weak pressing of the skin, did not have any effect on pupil diameter, while pressing the skin more than 720 g/cm2 produced a pressure-dependent pupil dilation. Pinching rather than pressing the skin induced the larger pupil dilation. Electrical stimulation of a sural afferent nerve with weak intensity, which was supra-threshold for Abeta-afferents and sub-threshold for Asigma-afferents, induced a reflex pupil dilation. This dilation continued to increase with further increases in stimulus intensity which involved excitation of Asigma afferents and C afferents. It is concluded that Abeta, Asigma and C afferents in the skin can work as afferents in eliciting reflex pupil dilation in anesthetized rats.

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