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The frog instantly dies when the spinal cord is pierced; and before this it lived without head, without heart or any bones or intestines or skin, and here therefore it would seem lies the foundation of movement and life. All the nerves of the animals derive from here: when this is pricked they instantly die.

— Leonardo da Vinci

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More quotes by Leonardo da Vinci

Things that are separate shall be united and acquire such virtue that they will restore to man his lost memory.

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Of the horse I will say nothing because I know the times.

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Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass, though but slowly.

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Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye.

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Animals will be seen on the earth who will always be fighting against each other with the greatest loss and frequent deaths on each side.

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Quote text and notes from Wikiquote: Leonardo da Vinci (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.