Descartes' idea of the 'hydraulic' action of the nerves (P,q) which he believed were hollow, provided with valves and supplied with fluid to cause the muscles to operate. They are here operating the muscles of the eye. From Rene Descartes "Opera Philiosophica", Frankfurt-am-Main, 1692. Woodcut

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Keywords: 17th, anatomy, century, engraving, eye, health, medical, medicine, physiology, scheme