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wood prints black and white wood prints eyesight wood prints physiology wood prints anatomy wood prints the human body wood prints human nervous system wood prints horizontal wood prints france wood prints illustration wood prints biology wood prints 17th century wood prints uk wood prints woodcut wood prints eye wood prints science wood prints

drawings black and white drawings eyesight drawings physiology drawings anatomy drawings the human body drawings human nervous system drawings horizontal drawings france drawings illustration drawings biology drawings 17th century drawings uk drawings woodcut drawings eye drawings science drawings

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Descartes' representation of the antagonistic eye muscles, 1692. When E is relaxed A is innervated. Rene Decartes (1596-1650) believed that an animal spirit travelling down hollow nerves C and B contracted the muscles and blew them up, and that they relaxed when the spirit was shut off by valves. From Opera Philosophica by Rene Descartes. (Frankfurt-am-Main, 1692). Originally published in his Tractatus de homine. (Paris, 1664). (Photo by Oxford Science Archive/Print Collector/Getty Images)

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